Feedback circuit, voltage detection circuit, temperature detection circuit, chip, and electronic device

Abstract

The embodiments of the present application provide a feedback circuit, a voltage detection circuit, a temperature detection circuit, a chip, and an electronic device. The feedback circuit comprises: a voltage output module, the voltage output module being used for outputting a first voltage signal and a second voltage signal, wherein there is a first voltage difference between the first voltage signal and the second voltage signal; and a feedback module, the feedback module being used for outputting a feedback charge signal on the basis of the first voltage signal and / or the first voltage difference, wherein each time the feedback module outputs the feedback charge signal on the basis of the first voltage difference, the voltage output module performs switching from the present voltage output mode to another voltage output mode, such that the feedback module outputs the feedback charge signal on the basis of first voltage differences generated in different voltage output modes. In the present application, the mismatch amount of a feedback charge signal during N processes of outputting the feedback charge signal can be quantified by means of first mismatch voltages in multiple voltage output modes, thereby facilitating the reduction of a mismatch effect of a Sigma-Delta modulator.

Description

Feedback circuit, voltage detection circuit, temperature detection circuit, chip and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 3, 2024, with application number 202410010631.5 and invention name “Feedback circuit, voltage detection circuit, temperature detection circuit, chip and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of integrated circuits, and in particular to a feedback circuit, a voltage detection circuit, a temperature detection circuit, a chip, and an electronic device. Background Art

[0003] Currently, a Sigma-Delta modulator (SDM) is a high-precision analog-to-digital converter with oversampling characteristics, commonly used for high-precision measurement of low-frequency voltage signals. In related technologies, a Sigma-Delta modulator mainly includes an integrator that integrates the charge of an input voltage signal and a reference voltage signal, a comparator that compares the integrator's output results, and a feedback circuit that generates a reference voltage signal. The comparator's output controls the positive and negative values ​​of the reference voltage signal, making the integrator's output close to or equal to zero over multiple cycles. Finally, after the integrator integrates the input voltage signal and the reference voltage signal multiple times, the magnitude of the input voltage signal is quantified by feeding back the difference between the number of positive and negative times of the reference voltage signal and the magnitude of the reference voltage signal.

[0004] However, due to the mismatch phenomenon of electronic components caused by factors such as process errors and dimensional deviations, the reference voltage signal output by the feedback circuit of the Sigma-Delta modulator has a mismatch voltage. If the mismatch voltage cannot be determined, the Sigma-Delta modulator will cause measurement errors, thereby reducing the measurement accuracy of the Sigma-Delta modulator. Technical Solutions

[0005] The technical solution of this application is as follows:

[0006] In a first aspect, an embodiment of the present application provides a feedback circuit, which is configured to feed back N feedback charge signals during a measurement process, where N is an integer greater than 1. The feedback circuit includes:

[0007] A voltage output module, the voltage output module is used to output a first voltage signal and a second voltage signal, and there is a first voltage difference between the first voltage signal and the second voltage signal;

[0008] A feedback module, the feedback module is configured to output a feedback charge signal according to the first voltage signal and / or the first voltage difference;

[0009] The first voltage signal has a first mismatch voltage, the voltage output module has multiple voltage output modes, and the first mismatch voltages of the first voltage signal output by the voltage output module in at least two voltage output modes are not equal;

[0010] Whenever the feedback module outputs a feedback charge signal according to the first voltage difference, the voltage output module switches the current voltage output mode to another voltage output mode, so that the feedback module outputs a feedback charge signal according to the first voltage difference generated by the different voltage output modes.

[0011] In a second aspect, the present application provides a voltage detection circuit, comprising the feedback circuit as described in the first aspect.

[0012] In a third aspect, the present application provides a temperature detection circuit, characterized in that it includes:

[0013] In the feedback circuit of the first aspect, the first voltage difference has a first temperature coefficient, the first voltage signal has a second temperature coefficient, one of the first temperature coefficient and the second temperature coefficient is a positive temperature coefficient, and the other is a negative temperature coefficient;

[0014] a metering circuit, the metering circuit being configured to integrate the N feedback charge signals outputted by the feedback circuit, and determine a voltage value of a first voltage difference according to the first number, the second number, and a reference voltage;

[0015] The first number is the number of times the feedback module outputs a feedback charge signal based on the first voltage signal, and the second number is the number of times the feedback module outputs a feedback charge signal based on the first voltage difference;

[0016] The reference voltage is a zero temperature coefficient voltage determined based on the first voltage signal and the first voltage difference, and an integration result of the metering circuit on the N-times feedback charge signal is less than a preset voltage.

[0017] In a fourth aspect, an embodiment of the present application further provides a chip comprising the voltage detection circuit described in the second aspect and / or the temperature detection circuit described in the third aspect.

[0018] In a fifth aspect, an embodiment of the present application further provides an electronic device comprising the chip described in the fourth aspect above.

[0019] The present application quantifies the mismatch amount of the feedback charge signal during the N-times feedback charge signal output process through the mismatch voltage of multiple voltage output modes. After calibrating the Sigma-Delta modulator, the influence of the mismatch voltage on the Sigma-Delta modulator can be reduced, and ultimately it is beneficial to improve the measurement accuracy of the Sigma-Delta modulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] FIG1 shows a module schematic diagram of a Sigma-Delta modulator in the related art.

[0022] FIG2 shows a module schematic diagram of a feedback circuit in an embodiment of the present application.

[0023] FIG3 shows a schematic diagram of a voltage output module in an embodiment of the present application.

[0024] FIG4 shows a circuit diagram of a voltage output module in an embodiment of the present application.

[0025] FIG5 shows another circuit diagram of the voltage output module in an embodiment of the present application.

[0026] FIG6 shows a circuit diagram of a feedback module in an embodiment of the present application.

[0027] FIG7 shows another circuit diagram of the feedback module in an embodiment of the present application.

[0028] FIG8 shows a working schematic diagram of the feedback circuit in an embodiment of the present application.

[0029] FIG9 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0030] FIG10 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0031] FIG11 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0032] FIG12 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0033] FIG13 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0034] FIG14 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0035] FIG15 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0036] FIG16 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0037] FIG17 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0038] FIG18 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0039] FIG19 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0040] FIG20 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0041] FIG21 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0042] FIG22 shows a schematic diagram of a feedback module in an embodiment of the present application.

[0043] FIG23 shows another circuit diagram of the feedback module in an embodiment of the present application.

[0044] FIG24 shows a schematic diagram of a working state of the feedback module in an embodiment of the present application.

[0045] FIG25 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0046] FIG26 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0047] FIG27 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0048] FIG28 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0049] FIG29 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0050] FIG30 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0051] FIG31 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0052] FIG32 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0053] FIG33 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0054] FIG34 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0055] FIG35 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0056] FIG36 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0057] FIG37 shows another working schematic diagram of the feedback circuit in an embodiment of the present application.

[0058] Figure 38 shows a module schematic diagram of the voltage detection circuit in an embodiment of the present application.

[0059] Figure 39 shows another module schematic diagram of the voltage detection circuit in an embodiment of the present application.

[0060] Figure 40 shows a circuit schematic diagram of a voltage detection circuit in an embodiment of the present application.

[0061] Figure 41 shows a module schematic diagram of the temperature detection circuit in an embodiment of the present application.

[0062] Figure 42 shows a circuit schematic diagram of a temperature detection circuit in an embodiment of the present application.

[0063] Among them, 10 are voltage output modules and 20 are feedback modules;

[0064] First voltage signal Vbep, second voltage signal Vben, first voltage difference VBE, feedback charge signal QR, voltage output modes VM1-VM12, charge feedback modes QM1-QM2;

[0065] Voltage generating submodule 11, first switch S1, second switch S2, third switch S3, fourth switch S4, transistor BJT, current source Iu;

[0066] Charge feedback submodule 21, first sub-switch S01, second sub-switch S02, third sub-switch S03, first capacitor Cf;

[0067] Feedback circuit 100, voltage input circuit 200, metering circuit 300, integration module 310, comparison module 320, counting module 330, voltage signal to be measured Vin, charge signal to be measured Qin, integrated voltage signal VI, preset voltage Vref, control signal VC.

[0068] Implementation Methods of the Application

[0069] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0070] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0071] In the embodiments of the present application, it should be noted that, in this document, relational terms such as first and second, etc., are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0072] Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0073] In the description of the embodiments of this application, words such as "example" or "for example" are used to indicate an example, illustration, or description. Any embodiment or design described as "for example" or "for example" in the embodiments of this application is not to be construed as being preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to clearly present relative concepts.

[0074] In addition, in the embodiments of the present application, "plurality" refers to two or more. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two, or more. For example, "including at least one" means including one, two, or more, and does not limit which ones are included. For example, "including at least one of A, B, and C" means including A, B, C, A and B, A and C, B and C, or A, B, and C.

[0075] It should be noted that in the embodiments of the present application, "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0076] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0077] The first electrode / first end of each transistor used in the embodiments of the present application is one of the source and the drain, and the second electrode / second end of each transistor is the other of the source and the drain. Since the source and drain of the transistor can be symmetrical in structure, the source and drain can be structurally indistinguishable, that is, the first electrode / first end and the second electrode / second end of the transistor in the embodiments of the present application can be structurally indistinguishable. For example, in the case where the transistor is a P-type transistor, the first electrode / first end of the transistor is the source, and the second electrode / second end is the drain; for example, in the case where the transistor is an N-type transistor, the first electrode / first end of the transistor is the drain, and the second electrode / second end is the source.

[0078] In the circuit structure provided in the embodiments of the present application, the first node, the second node and other nodes do not represent actual components, but represent the junction points of related couplings in the circuit diagram. That is, these nodes are nodes formed by the equivalent junction points of related couplings in the circuit diagram.

[0079] Currently, the Sigma-Delta modulator is a high-precision analog-to-digital converter with oversampling characteristics, commonly used for high-precision measurement of low-frequency voltage signals. Taking Figure 1 as an example, the Sigma-Delta modulator primarily comprises a feedback circuit that generates a reference voltage signal Vdac, an integrator that performs charge integration on the input voltage signal V0 and the reference voltage signal Vdac, a comparator that compares the integrator's output voltage, and a counter that records the comparator's output. The comparator's output controls the positive and negative values ​​of the reference voltage signal Vref, ensuring that the integrator's output approaches or equals zero over multiple cycles. For example, during one cycle, if the output voltage of the comparison integrator is greater than the reference voltage VR, the feedback circuit is controlled to output a negative reference voltage signal -Vdac during the next cycle, causing the integrator's output voltage to decrease. Conversely, during one cycle, if the output voltage of the comparison integrator is less than the reference voltage VR, the feedback circuit is controlled to output a positive reference voltage signal +Vdac during the next cycle, causing the integrator's output voltage to increase.

[0080] During the operation of the Sigma-Delta modulator, the integrator performs charge integration on the input voltage signal V0 and the reference voltage signal Vdac in each cycle. Assuming that the integrated charge corresponding to the input voltage signal V0 and the reference voltage signal Vdac is proportional to the voltage, since the output result of the integrator is close to or equal to 0 after multiple cycles, the input voltage signal V0, the reference voltage signal Vdac, the number of times the positive reference voltage signal +Vdac is fed back, and the number of times the negative reference voltage signal -Vdac is fed back satisfy the following relationship: V0*(X1+X2)=(Vdac*X1)-(Vdac*X2)

[0081] Wherein, X1 is the number of times the positive reference voltage signal +Vdac is fed back, and X2 is the number of times the negative reference voltage signal -Vdac is fed back.

[0082] Therefore, the input voltage signal V0 can be calculated as follows:

[0083] It can be seen that the number of cycles (i.e., the sum of X1 and X2) and the accuracy of the reference voltage signal Vdac determine the measurement accuracy of the Sigma-Delta modulator. However, due to mismatches in electronic components caused by factors such as process errors and dimensional deviations, the reference voltage signal Vdac output by the feedback circuit of the Sigma-Delta modulator has a mismatch voltage. If the mismatch voltage cannot be determined, the Sigma-Delta modulator will cause measurement errors, thereby reducing the measurement accuracy of the Sigma-Delta modulator.

[0084] To this end, the present application provides a feedback circuit, a voltage detection circuit, a temperature detection circuit, a chip and an electronic device, which are described in detail below.

[0085] First, referring to FIG. 2 , the feedback circuit 100 is used to feed back the feedback charge signal QR N times during one measurement process, where N is an integer greater than 1. The feedback circuit 100 includes:

[0086] A voltage output module 10 is configured to output a first voltage signal Vbep and a second voltage signal Vben, wherein a first voltage difference VBE exists between the first voltage signal Vbep and the second voltage signal Vben;

[0087] A feedback module 20 is configured to output a feedback charge signal QR according to the first voltage signal Vbep and / or the first voltage difference VBE;

[0088] The first voltage signal Vbep has a first mismatch voltage, the voltage output module 10 has multiple voltage output modes, and the first mismatch voltages of the first voltage signal Vbep output by the voltage output module 10 in at least two voltage output modes are not equal;

[0089] Whenever the feedback module 20 outputs a feedback charge signal QR according to the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to another voltage output mode, so that the feedback module 20 outputs the feedback charge signal QR according to the first voltage difference VBE generated in different voltage output modes.

[0090] Specifically, the voltage output module 10 has multiple voltage output modes and can output a first voltage signal Vbep and a second voltage signal Vben in corresponding voltage output modes, so that the feedback module 20 generates the first voltage signal Vbep and / or the first voltage difference VBE according to the corresponding voltage output mode and outputs the feedback charge signal QR. The first voltage signal Vbep output by the voltage output module 10 in the voltage output mode has a first mismatch voltage. The first mismatch voltages of the first voltage signal Vbep output by the voltage output module 10 in at least two voltage output modes are unequal. The first mismatch voltage can be caused by mismatch of electronic components (e.g., transistors) in the internal circuit of the voltage output module 10, or by mismatch of an introduced external signal (e.g., a bias current signal).

[0091] In some embodiments of the present application, referring to FIG3 , the voltage output module 10 includes a plurality of voltage generating sub-modules 11, each of which can output a first voltage signal Vbep and a second voltage signal Vben. The first mismatch voltages of the first voltage signals Vbep output by each of the voltage generating sub-modules 11 are not equal. The voltage output module 10 switches the voltage output mode by switching the voltage generating sub-module 11 that outputs the first voltage signal Vbep and the second voltage signal Vben, and makes the first mismatch voltages of the first voltage signal Vbep output by the voltage output module 10 in at least two voltage output modes not equal.

[0092] As an example, referring to Figure 4, each voltage generating sub-module 11 includes a current source I1, a current source I2, a switch s1, a switch s2, a transistor BJT1 and a transistor BJT2. When the switches s1 and s2 of one of the voltage generating sub-modules 11 are closed, the current source I1 provides current to the transistor BJT1, and the current source I2 provides current to the transistor BJT2, thereby generating a first voltage signal Vbep at one end of the transistor BJT1 and generating a second voltage signal Vben at one end of the transistor BJT2. Ultimately, each voltage generating sub-module 11 can output the first voltage signal Vbep and the second voltage signal Vben.

[0093] Due to the mismatch between the transistors BJT1 and BJT2, the current signals input by the current source IuI1, and the current signals input by the current source IuI2, the first voltage signal Vbep has a first mismatch voltage, and the second voltage signal Vben has a second mismatch voltage. In the case where the current signals input by the transistors BJT1 and BJT2, the current sources I1, and the current signals input by the current source I2 in each voltage generating sub-module 11 are mismatched and inconsistent, the first mismatch voltages of the first voltage signal Vbep output by the voltage output module 10 in each voltage output mode are ultimately not equal.

[0094] It is understandable that the transistors BJT1 and BJT2 in the above circuit are replaced by other types of electronic components, such as a MOS tube with a source and a gate short-circuited, or a resistor.

[0095] As another example, referring to FIG5 , the voltage output module 10 includes M1 bias current sources Iu, M1 first switches S1, M1 second switches S2, N1 third switches S3, N1 fourth switches S4, and N1 transistors BJT; the first switches S1 correspond to the bias current sources Iu one by one, the first end of each first switch S1 is connected to the corresponding bias current source Iu, and the second end of each first switch S1 is connected to the first end of N1 third switches S3; the third switches S1 correspond to the bias current sources Iu one by one, the first end of each first switch S1 is connected to the corresponding bias current source Iu, and the second end of each first switch S1 is connected to the first end of N1 third switches S3; S3 corresponds one-to-one to the transistor BJT, and the second end of each third switch S3 is connected to the corresponding transistor BJT; the second switch S2 corresponds one-to-one to the bias current source Iu, the first end of each second switch S2 is connected to the corresponding bias current source Iu, and the second end of each second switch S2 is connected to N1 fourth switches S4; the fourth switch S4 corresponds one-to-one to the transistor BJT, and the second end of each fourth switch S4 is connected to the corresponding transistor BJT; wherein M1 and N1 are integers greater than 1.

[0096] Specifically, when the voltage output module 10 is in a certain voltage output mode, any M2 of the M1 first switches S1 are closed, and any N2 of the N1 third switches S3 are closed. At this time, the M2 bias current sources Iu provide current to the N2 parallel transistors BJT, thereby generating a first voltage signal Vbep between the first switch S1 and the third switch S3. Simultaneously, when the voltage output module 10 is in a certain voltage output mode, any M1-M2 of the M1 second switches S2 are closed, and any N1-N2 of the N1 third switches S3 are closed, thereby generating a second voltage signal Vben between the second switch S2 and the fourth switch S4.

[0097] It can be seen that due to the mismatch between the current signals input by the transistor BJT and the current source Iu, when the voltage output module 10 switches the voltage output mode and changes the closed switch to introduce different current signals of the transistor BJT and the current source Iu, the first mismatch voltage of the first voltage signal Vbep is not equal in different voltage output modes, and the second mismatch voltage of the second voltage signal Vben is also not equal in different voltage output modes.

[0098] In some embodiments of the present application, M1, M2, N1, and N2 satisfy the following relationship: M1-M2=1 N2=1

[0099] For the first voltage signal Vbep, the current source Iu is selected as follows: species (i.e. M1) combination, and the choice of transistor BJT is species (i.e. N1 kinds) combination, so the first voltage signal Vbep can correspond to M1*N1 kinds of voltage output modes according to the above combination; similarly, for the second voltage signal Vben, the selection of the current source Iu is species (i.e. M1) combination, and the choice of transistor BJT is species (i.e. Therefore, the second voltage signal Vben can also correspond to M1*N1 voltage output modes according to the above combination, and ultimately the voltage output module 10 has M1*N1 voltage output modes. Compared with the embodiment in which the voltage output module 10 includes multiple voltage generating sub-modules 11, the voltage output module 10 of the above embodiment shares the transistor BJT and the current source Iu, which can simplify the circuit structure while providing a larger number of voltage output modes.

[0100] In some embodiments of the present application, the first voltage signal Vbep has a first temperature coefficient, the first voltage difference VBE has a second temperature coefficient, one of the first temperature coefficient and the second temperature coefficient is a positive temperature coefficient, and the other is a negative temperature coefficient. When the feedback module 20 outputs the feedback charge signal QR based on the first voltage signal Vbep and the first voltage difference VBE, a reference voltage with a zero temperature coefficient is generated by the first voltage signal Vbep and the first voltage difference VBE, and the feedback module 20 can generate a corresponding feedback charge signal QR based on the reference voltage with a zero temperature coefficient, thereby avoiding the phenomenon that the feedback charge signal QR is indirectly affected by temperature due to the voltage signal having a temperature coefficient.

[0101] In some embodiments of the present application, for example, in an embodiment in which the second voltage signal Vben and the first voltage signal Vbep are generated by a transistor and a current source, the second voltage signal Vben and the first voltage signal Vbep are both negative temperature coefficient voltages, and the first voltage difference VBE is a positive temperature coefficient voltage.

[0102] It can be understood that the second voltage signal Vben and the first voltage signal Vbep may both be positive temperature coefficient voltages, and the first voltage difference VBE may be a negative temperature coefficient voltage.

[0103] The feedback module 20 can output the feedback charge signal QR based on the first voltage signal Vbep and / or the first voltage difference VBE. For example, the feedback module 20 can output the feedback charge signal QR based only on the first voltage signal Vbep to output the feedback charge signal QR having a temperature coefficient (e.g., a negative temperature coefficient). For another example, the feedback module 20 can output the feedback charge signal QR based only on the first voltage difference VBE to output the feedback charge signal QR having a temperature coefficient (e.g., a positive temperature coefficient). For another example, the feedback module 20 can output the feedback charge signal QR based on the first voltage difference VBE and the first voltage signal Vbep to output the feedback charge signal QR having a zero temperature coefficient.

[0104] It should be noted that, in the present application, the feedback module 20 outputs the feedback charge signal QR only according to the first voltage signal Vbep (or the first voltage difference VBE), which means that the feedback module 20 only receives the first voltage signal Vbep (or the first voltage difference VBE) and outputs the feedback charge signal QR; and the feedback module 20 outputs the feedback charge signal QR according to the first voltage signal Vbep, which may mean that the feedback module 20 only receives the first voltage signal Vbep and outputs the feedback charge signal QR, or it may mean that the feedback module 20 simultaneously receives the first voltage signal Vbep and the first voltage difference VBE and outputs the feedback charge signal QR; similarly, the feedback module 20 outputs the feedback charge signal QR according to the first voltage signal Vbep, which may mean that the feedback module 20 only receives the first voltage difference VBE and outputs the feedback charge signal QR, or it may mean that the feedback module 20 simultaneously receives the first voltage signal Vbep and the first voltage difference VBE and outputs the feedback charge signal QR.

[0105] In some embodiments of the present application, the feedback module 20 may include a switched capacitor circuit to output the feedback charge signal QR via the switched capacitor circuit. For example, referring to FIG6 , the feedback module 20 includes a first sub-switch S01, a second sub-switch S02, a third sub-switch S03, and a first capacitor Cf. The first end of the first sub-switch S01 is configured to receive the first voltage signal Vbep, and the second end of the first sub-switch S01 is connected to the first end of the first capacitor Cf. The first end of the second sub-switch S02 is configured to receive the second voltage signal Vben, and the second end of the second sub-switch S02 is connected to the first end of the first capacitor Cf. The first end of the third sub-switch S03 is configured to be connected to ground, and the second end of the third sub-switch S03 is connected to the first end of the first capacitor Cf.

[0106] For example, taking the feedback module 20 outputting the feedback charge signal QR based on the first voltage signal Vbep as an example, when the first sub-switch S01 is closed, the second sub-switch S02 is opened, and the third sub-switch S03 is opened, the first capacitor Cf is connected to the first voltage signal Vbep for charging; when the first capacitor Cf is completely charged, the first sub-switch S01 and the second sub-switch S02 are opened, and the third sub-switch S03 is closed. Then, the charge amount of the feedback charge signal QR outputted by the first capacitor Cf satisfies the relationship: QR=-Vbep*Cf, so that the feedback module 20 outputs the feedback charge signal QR corresponding to the charge amount based on the first voltage signal Vbep.

[0107] For another example, taking the feedback module 20 outputting the feedback charge signal QR based on the first voltage difference VBE as an example, when the first sub-switch S01 is closed, the second sub-switch S02 is opened, and the third sub-switch S03 is opened, the first capacitor Cf is connected to the first voltage signal Vbep for charging; when the first capacitor Cf is completely charged, the first sub-switch S01 and the third sub-switch S03 are opened, and the second sub-switch S02 is closed, the charge amount of the feedback charge signal QR output by the first capacitor Cf satisfies the relationship: QR = (Vbep - Vben) * Cf = VBE * Cf, so that the feedback module 20 outputs the feedback charge signal QR corresponding to the charge amount based on the first voltage difference VBE.

[0108] It can be understood that when the feedback module 20 needs to output the feedback charge signal QR based on the first voltage difference VBE and the first voltage signal Vbep, the above-mentioned circuit structure can be arrayed so that one switched capacitor circuit in the array circuit outputs the feedback charge signal QR based on the first voltage difference VBE, and at the same time, another switched capacitor circuit in the array circuit outputs the feedback charge signal QR based on the first voltage signal Vbep, and finally the feedback module 20 outputs the feedback charge signal QR of the corresponding charge amount based on the first voltage difference VBE and the first voltage signal Vbep.

[0109] In some embodiments of the present application, the feedback module 20 may include a switch resistor circuit that outputs the feedback charge signal QR via the switch resistor circuit. For example, referring to FIG7 , the feedback module 20 includes a first sub-switch S01, a second sub-switch S02, and a first resistor. The first end of the first sub-switch S01 is configured to receive the first voltage signal Vbep, the second end of the first sub-switch S01 is connected to the first end of the first resistor, the first end of the second sub-switch S02 is configured to receive the first voltage difference VBE, and the second end of the second sub-switch S02 is connected to the first end of the first resistor. When the first sub-switch S01 is closed for a preset time and then opened, the amount of charge flowing through the first resistor is: Q = Vbep / Rf*t1, t1 is the closing time of the first sub-switch S01, so that the feedback module 20 outputs a feedback charge signal QR corresponding to the charge amount according to the first voltage signal Vbep; similarly, when the second sub-switch S02 is closed for a preset time and then opened, the amount of charge flowing through the first resistor is: Q = VBE / Rf*t2, t2 is the closing time of the second sub-switch S02, so that the feedback module 20 outputs a feedback charge signal QR corresponding to the charge amount according to the first voltage difference VBE.

[0110] It can be understood that the feedback module 20 can also include a switched capacitor circuit and a switched resistor circuit at the same time. For example, the switched resistor circuit of the feedback module 20 is used to output a feedback charge signal QR corresponding to the charge amount according to the first voltage signal Vbep, and the switched capacitor circuit of the feedback module 20 is used to output a feedback charge signal QR corresponding to the charge amount according to the first voltage difference VBE.

[0111] In some embodiments of the present application, when the feedback circuit 100 outputs the feedback charge signal QR at a certain time, the feedback charge signal QR can be a positive charge signal, a negative charge signal, or 0, so that after the Sigma-Delta modulator receives the feedback charge signal QR multiple times, the output result of the integrator is close to or equal to zero, so that the Sigma-Delta modulator can measure the voltage and / or temperature.

[0112] It should be noted that, taking the example where the feedback module 20 includes a switched capacitor circuit and the feedback module outputs a feedback signal each time according to the first voltage difference VBE and the first voltage signal Vbep, the feedback charge signal output by the feedback circuit each time can be calculated according to the following formula:

[0113] in, is the capacitance value of the capacitor corresponding to the first voltage difference VBE, The first voltage signal Vbep is the capacitance value of the corresponding capacitor. Then, the charge mismatch dQ of the feedback charge signal can be calculated according to the following formula:

[0114] In the above formula, the first voltage difference VBE and the first voltage signal Vbep can be calculated according to the following formula: I x =xI u I y =yI s

[0115] Among them, V T is the temperature coefficient of the thermovoltage, I x is the input current of the transistor BJT, I s is the saturation current of the transistor BJT, I u is the input current of the transistor BJT, I y is the saturation current of the transistor BJT.

[0116] As for the capacitance mismatch dC and current mismatch It can be calculated as follows:

[0117] Among them, σ u is the standard deviation of capacitance, is the standard deviation of the current, n2 is the number of capacitors, x is the input current I u The number of

[0118] Therefore, the charge mismatch dQ of the feedback charge signal can be calculated as follows:

[0119] It can be seen that for the first input voltage Vbep, the charge mismatch dQ of the feedback charge signal is mainly affected by the capacitance mismatch. As for the first voltage difference, the charge mismatch dQ of the feedback charge signal is mainly affected by the current and the transistor mismatch. That is, the first mismatch voltage generated by the first input voltage Vbep (the second mismatch voltage generated by the second input voltage Vben).

[0120] Therefore, in the embodiment of the present application, since each time the feedback module 20 outputs a feedback charge signal QR according to the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to another voltage output mode, the feedback module 20 can output the feedback charge signal QR according to the first voltage difference VBE generated by different voltage output modes, so that in the process of outputting the feedback charge signal QR N times, the charge mismatch amount of the feedback charge signal QR output by the first voltage difference VBE generated by different voltage output modes can be accumulated, and finally the mismatch amount of the feedback charge signal QR in the process of outputting the feedback charge signal QR N times can be quantified by the mismatch voltages of multiple voltage output modes. After calibrating the Sigma-Delta modulator, the influence of the mismatch voltage on the Sigma-Delta modulator can be reduced, and ultimately it is beneficial to improve the voltage measurement accuracy of the Sigma-Delta modulator.

[0121] In some embodiments of the present application, each time the feedback module 20 outputs the feedback charge signal QR only once based on the first voltage signal Vbep, the voltage output mode of the voltage output module 10 remains unchanged. For example, referring to FIG8 , the current voltage output mode of the voltage output module 10 is the VM2 mode. After the feedback module 20 outputs the feedback charge signal QR once based on the first voltage signal Vbep corresponding to the voltage output mode VM2, the voltage output mode of the voltage output module 10 remains in the VM2 mode. In other words, the next time the feedback module 20 outputs the feedback charge signal QR, the voltage output mode of the voltage output module 10 remains in the VM2 mode.

[0122] It should be noted that, since the charge mismatch dQ of the feedback charge signal is mainly affected by the capacitance mismatch for the first voltage difference VBE, each time the feedback module 20 outputs a feedback charge signal QR according to the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to another voltage output mode, which is conducive to ensuring that the voltage output module 10 switches to other voltage output modes and accumulates the mismatch of the feedback charge signal QR corresponding to the first voltage difference VBE; and each time the feedback module 20 outputs a feedback charge signal QR according to the first voltage signal Vbep, the voltage output mode of the voltage output module 10 remains unchanged, which can ensure that when the feedback module 20 outputs the next feedback charge signal QR according to the first voltage difference VBE, the mismatch corresponding to the voltage output mode is collected, which is conducive to ensuring that the feedback module 20 outputs at least one feedback charge signal QR according to the first voltage difference VBE corresponding to each voltage output mode.

[0123] That is to say, in the embodiment of the present application, when the feedback module 20 outputs the feedback charge signal QR only once according to the first voltage signal Vbep, the feedback module 20 does not switch the voltage output mode. Only when the feedback module 20 outputs the feedback charge signal QR once according to the first voltage difference VBE (or according to the first voltage difference VBE and the first voltage signal Vbep), the feedback module 20 switches the voltage output mode. This is not only conducive to the voltage output module 10 switching to other voltage output modes, but also ensures that the feedback module 20 outputs at least one feedback charge signal QR according to the first voltage difference VBE corresponding to each voltage output mode.

[0124] In some embodiments of the present application, the voltage output module 10 may switch its current voltage output mode to another voltage output mode after the feedback module 20 outputs a primary feedback charge signal QR based on the first voltage difference VBE. For example, referring to FIG. 9 , the current voltage output mode of the voltage output module 10 is VM2 mode. After the feedback module 20 outputs a primary feedback charge signal QR based on the first voltage difference VBE corresponding to the voltage output mode VM2, the voltage output mode of the voltage output module 10 switches to VM3 mode. In other words, after outputting the primary feedback charge signal QR, the voltage output module 10 may switch its current voltage output mode to another voltage output mode.

[0125] In some embodiments of the present application, the voltage output module 10 may switch its current voltage output mode to another voltage output mode before the feedback module 20 outputs the primary feedback charge signal QR based on the first voltage difference VBE. For example, referring to FIG10 , before the feedback module 20 outputs the primary feedback charge signal QR based on the first voltage difference VBE, the voltage output module 10 has already switched its voltage output mode from VM2 mode to VM3 mode. Therefore, during the current output of the feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR based on the first voltage difference VBE corresponding to the VM3 mode. In other words, the voltage output module 10 may have already switched its current voltage output mode to another voltage output mode before outputting the primary feedback charge signal QR.

[0126] It should be noted that the feedback module 20 outputs the feedback charge signal QR once according to the first voltage difference VBE, which may mean that the feedback module 20 outputs the feedback charge signal QR once only according to the first voltage difference VBE. For example, referring to Figure 9 or Figure 10, the feedback module 20 outputs the feedback charge signal QR once only according to the first voltage difference VBE. At the same time, it may also mean that the feedback module 20 outputs the feedback charge signal QR once according to the first voltage difference VBE and the first voltage signal Vbep. For example, referring to Figure 11, after the feedback module 20 outputs the feedback charge signal QR once according to the first voltage signal Vbep and the first voltage difference VBE, the voltage output mode of the voltage output module 10 is switched from VM2 mode to VM3 mode.

[0127] In some embodiments of the present application, for example, for an embodiment in which the feedback charge signal QR can be a positive charge signal or a negative charge signal, after the feedback module 20 outputs a feedback charge signal QR of a first polarity once according to the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to the next voltage output mode; before the feedback module 20 outputs a feedback charge signal QR of a second polarity once according to the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to the previous voltage output mode; wherein the first polarity is opposite to the second polarity, the next voltage output mode is the voltage output mode in which the voltage output module 10 is when the feedback module 20 outputs the feedback charge signal QR next time, and the previous voltage output mode is the voltage output mode in which the voltage output module 10 is when the feedback module 20 outputs the feedback charge signal QR of the first polarity according to the first voltage difference VBE last time.

[0128] As an example, referring to FIG12 , when outputting the M-th feedback charge signal QR, the voltage output module 10 is in the voltage output mode VM2, and the feedback module 20 outputs a positive feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2. After outputting the positive feedback charge signal QR, the voltage output module 10 switches the voltage output mode VM2 to the voltage output mode VM3. When outputting the M+1-th feedback charge signal QR, since the negative feedback charge signal QR is output according to the first voltage difference VBE, the negative feedback charge signal QR is output. Before outputting the M+2th feedback charge signal QR, the voltage output module 10 switches the voltage output mode VM3 to the voltage output mode VM2, and the feedback module 20 outputs a negative feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2; when outputting the M+2th feedback charge signal QR, the feedback module 20 continues to output a positive feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2, and after outputting the positive feedback charge signal QR, the voltage output module 10 switches the voltage output mode VM2 to the voltage output mode VM3.

[0129] As another example, referring to FIG13 , when outputting the Mth feedback charge signal QR, the voltage output module 10 is in the voltage output mode VM2, and the feedback module 20 outputs a positive feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2; when outputting the M+1th feedback charge signal QR, the feedback module 20 outputs a feedback charge signal QR according to the first voltage signal Vbep corresponding to the voltage output mode VM3; and when outputting the M+2th feedback charge signal QR, the feedback module 20 outputs a negative feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2; and when outputting the M+3th feedback charge signal QR, the feedback module 20 continues to output a positive feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2.

[0130] 12 and 13 , it can be seen that, in the process of outputting the Mth feedback charge signal QR and the M+1th (M+2th) feedback charge signal QR, the feedback module 20 outputs the feedback charge signals QR of the first polarity and the second polarity respectively in the same voltage output mode (VM2) according to the first voltage difference VBE, thereby offsetting the mismatch of the feedback charge signal QR in the voltage output mode (VM2) through positive and negative charges; and in the process of outputting the M+2th (M+3th) feedback charge signal QR, the feedback module 20 continues to output the positively charged feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2, thereby facilitating the accumulation of the charge mismatch of the first polarity (or second polarity) corresponding to the first voltage difference VBE of all voltage output modes, thereby avoiding the phenomenon that the mismatch of some voltage output modes is not accumulated due to the offset of positive and negative charges, making it impossible to perform gain calibration on the Sigma-Delta modulator.

[0131] In some embodiments of the present application, the voltage output module 10 switches the current voltage output mode to the next voltage output mode in a first preset order based on multiple voltage output modes; the voltage output module 10 switches the current voltage output mode to the previous voltage output mode in a second preset order based on multiple voltage output modes; wherein the first preset order is opposite to the second preset order.

[0132] For example, referring to FIG. 12 or FIG. 13 , when the voltage output module 10 needs to switch to the next voltage output mode, the voltage output module 10 switches the current voltage output mode to the next voltage output mode in the order of VM1-VM8; conversely, when the voltage output module 10 needs to switch to the previous voltage output mode, the voltage output module 10 switches the current voltage output mode to the next voltage output mode in the order of VM8-VM1.

[0133] For another example, referring to FIG14 , when the voltage output module 10 needs to switch to the next voltage output mode, the voltage output module 10 switches the current voltage output mode VM1 to the next voltage output mode VM2 in the clockwise order of VM1-VM12; referring to FIG15 , when the voltage output module 10 needs to switch to the previous voltage output mode, the voltage output module 10 switches the current voltage output mode VM2 to the previous voltage output mode VM1 in the counterclockwise order of VM12-VM1.

[0134] It should be noted that when the feedback circuit 100 continuously outputs the feedback charge signal QR of the second polarity based on the first voltage difference VBE from the beginning, the voltage output mode of the voltage output module 10 can be switched to the previous voltage output mode according to the second preset order from the initial voltage output mode. For example, referring to Figure 14, if the initial voltage output mode of the voltage output module 10 is VM1, when the feedback circuit 100 outputs the feedback charge signal QR for the first time, since the feedback charge signal QR with the second polarity is output this time based on the first voltage difference VBE, before outputting the feedback charge signal QR with the second polarity, the voltage output module 10 switches the voltage output mode VM1 to the voltage output mode VM12, and the feedback module 20 outputs the feedback charge signal QR of the second polarity once based on the first voltage difference VBE corresponding to the voltage output mode VM12.

[0135] In some embodiments of the present application, refer to Figure 16, wherein the voltage output mode of the voltage output module 10 includes a first polarity voltage output mode and a second polarity voltage output mode, the first polarity voltage output mode is a voltage output mode corresponding to the feedback charge signal QR of the first polarity output by the feedback module 20 according to the first voltage difference VBE, and the second polarity voltage output mode is a voltage output mode corresponding to the feedback charge signal QR of the second polarity output by the feedback module 20 according to the first voltage difference VBE.

[0136] Specifically, after the feedback module 20 outputs a feedback charge signal QR of the first polarity once according to the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to the next first polarity voltage output mode. The next first polarity voltage output mode is the voltage output mode in which the voltage output module 10 is when the feedback module 20 outputs a feedback charge signal QR of the first polarity according to the first voltage difference VBE next time.

[0137] For example, referring to FIG17 , when outputting the Mth feedback charge signal QR, the voltage output module 10 is in the first polarity voltage output mode VM2, and the feedback module 20 outputs the first polarity feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2; and when outputting the M+ath (a≥1) feedback charge signal QR, the voltage output module 10 is in the first polarity voltage output mode VM3, and the feedback module 20 outputs the first polarity feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM3, so as to accumulate the first polarity charge mismatch corresponding to the first voltage difference VBE of all voltage output modes.

[0138] On the contrary, after the feedback module 20 outputs the feedback charge signal QR of the second polarity according to the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to the next second polarity voltage output mode. The next second polarity voltage output mode is the voltage output mode in which the voltage output module 10 is when the feedback module 20 outputs the feedback charge signal QR of the second polarity according to the first voltage difference VBE next time.

[0139] For example, referring to FIG18 , when outputting the Mth feedback charge signal QR, the voltage output module 10 is in the second polarity voltage output mode VM1, and the feedback module 20 outputs the second polarity feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM1. When outputting the M+bth (b≥1) feedback charge signal QR, the voltage output module 10 is in the second polarity voltage output mode VM2, and the feedback module 20 outputs the second polarity feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM2, so as to accumulate the second polarity charge mismatch corresponding to the first voltage difference VBE of all voltage output modes.

[0140] That is, when the feedback module 20 outputs a feedback charge signal QR of a first polarity based on the first voltage difference VBE, the output mode of the voltage output module 10 switches to the first polarity voltage output mode, so that the feedback module 20 can output the feedback charge signal QR of the first polarity based on the first voltage difference VBE corresponding to all voltage modes, thereby accumulating the charge mismatch of the first polarity. When the feedback module 20 outputs a feedback charge signal QR of a second polarity based on the first voltage difference VBE, the output mode of the voltage output module 10 switches to the second polarity voltage output mode, so that the feedback module 20 can output the feedback charge signal QR of the second polarity based on the first voltage difference VBE corresponding to all voltage modes, thereby accumulating the charge mismatch of the second polarity. After obtaining the charge mismatch of the first polarity and the charge mismatch of the second polarity, the charge mismatch of the first polarity can be subtracted from the charge mismatch of the second polarity to obtain the total charge mismatch and quantify the mismatch voltage.

[0141] It can be understood that before the feedback module 20 outputs a feedback charge signal QR of the first polarity based on the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to the next first polarity voltage output mode; or, before the feedback module 20 outputs a feedback charge signal QR of the second polarity based on the first voltage difference VBE, the voltage output module 10 switches the current voltage output mode to the previous first polarity voltage output mode.

[0142] As an exemplary description of the working process of the feedback circuit 100 of the present application, referring to FIG19 , when outputting the M-th feedback charge signal QR, the voltage output module 10 is in the second polarity voltage output mode VM1, and the feedback module 20 outputs the first polarity feedback charge signal QR according to the first voltage difference VBE corresponding to the voltage output mode VM1; and when outputting the M+1-th feedback charge signal QR, the second polarity voltage output mode is changed from the VM1 voltage output mode to the VM2 voltage output mode. Since the feedback charge signal QR of the first polarity is output this time, the voltage output module 10 is in the first polarity In voltage output mode VM2, the feedback module 20 outputs a feedback charge signal QR of the first polarity according to the first voltage difference VBE corresponding to the first polarity voltage output mode VM2; and when outputting the M+2th feedback charge signal QR, the first polarity voltage output mode is changed from the VM2 voltage output mode to the VM3 voltage output mode. Since the feedback charge signal QR of the second polarity is output this time, the voltage output module 10 is in the second polarity voltage output mode VM2, and the feedback module 20 outputs the feedback charge signal QR of the second polarity according to the first voltage difference VBE corresponding to the second polarity voltage output mode VM2.

[0143] As another exemplary illustration of the working process of the feedback circuit 100 of the present application, referring to Figure 20, when outputting the Mth feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR of the first polarity according to the first voltage difference VBE corresponding to the voltage output mode VM2; and when outputting the M+1th feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR of the first polarity according to the first voltage difference VBE corresponding to the second polarity voltage output mode VM1; and when outputting the M+2th feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR of the first polarity according to the first voltage difference VBE corresponding to the first polarity voltage output mode VM3.

[0144] In some embodiments of the present application, the voltage output module 10 switches the current voltage output mode to the next first polarity voltage output mode according to a third preset order based on multiple voltage output modes; the voltage output module 10 switches the current voltage output mode to the next second polarity voltage output mode according to a fourth preset order based on multiple voltage output modes; wherein the third preset order is the same as or opposite to the fourth preset order.

[0145] For example, referring to Figure 19 or Figure 20, when the voltage output module 10 needs to switch to the next first polarity voltage output mode, the voltage output module 10 switches the current voltage output mode to the next voltage output mode in the order of VM1-VM8; conversely, when the voltage output module 10 needs to switch to the next second polarity voltage output mode, the voltage output module 10 can switch the current voltage output mode to the next voltage output mode in the order of VM8-VM1, so that during the process of the feedback module 20 outputting the feedback charge signal QR N times, the voltage output module 10 switches to other voltage output modes.

[0146] It should be noted that the above content is related to solving the voltage mismatch problem. In fact, according to the charge calculation formula: Q = U * C, when the feedback circuit 100 feeds back the charge signal QR, there is not only a mismatch caused by voltage mismatch, but also a mismatch caused by capacitance mismatch. To solve the capacitance mismatch problem, please refer to the following content:

[0147] In some embodiments of the present application, referring to FIG. 21 , the feedback module 20 has multiple charge feedback modes, and the mismatch capacitance of the feedback module 20 in at least two charge feedback modes is unequal. Mismatch capacitance refers to the deviation of a capacitor in the feedback module 20 from a set capacitance value due to mismatch. For example, if the capacitance value of a capacitor in the feedback module 20 is set to 100 pF, but the actual value of the capacitor may be 95 pF to 105 pF, the deviation of ±5 pF is the mismatch capacitance of the feedback module 20.

[0148] In some embodiments of the present application, referring to FIG. 22 , the feedback module 20 includes a plurality of charge feedback submodules 21 ; each charge feedback submodule 21 is configured to output a feedback charge signal QR, and the mismatch capacitance of each charge feedback submodule 21 is not equal; the feedback module 20 outputs the feedback charge signal QR according to the first voltage signal Vbep and / or the first voltage difference VBE in different charge feedback modes.

[0149] In some embodiments of the present application, one of the multiple charge feedback sub-modules 21 outputs the feedback charge signal QR, which is a charge feedback mode of the feedback module 20. For example, referring to Figures 21 and 22, when the feedback module 20 is in the charge feedback mode QM1, the feedback module 20 outputs the feedback charge signal QR through the charge feedback sub-module 1; when the feedback module 20 is in the charge feedback mode QM2, the feedback module 20 outputs the feedback charge signal QR through the charge feedback sub-module 2, and so on.

[0150] In some embodiments of the present application, when multiple of the charge feedback submodules 21 simultaneously output the feedback charge signal QR, this constitutes a charge feedback mode of the feedback module 20. For example, referring again to FIG. 21 and FIG. 22 , when the feedback module 20 is in charge feedback mode QM1, the feedback module 20 outputs the feedback charge signal QR via the charge feedback submodule 1 and the charge feedback submodule 2.

[0151] In some embodiments of the present application, for example, for an embodiment in which the feedback module 20 includes multiple charge feedback sub-modules 21, referring to Figure 23, each charge feedback sub-module 21 includes a first sub-switch S01, a second sub-switch S02, a third sub-switch S03 and a first capacitor Cf; the first end of the first sub-switch S01 is used to access the first voltage signal Vbep, and the second end of the first sub-switch S01 is connected to the first end of the first capacitor Cf; the first end of the second sub-switch S02 is used to access the second voltage signal Vben, and the second end of the second sub-switch S02 is connected to the first end of the first capacitor Cf; the first end of the third sub-switch S03 is used to connect to the ground end, and the second end of the third switch S3 is connected to the first end of the first capacitor Cf.

[0152] Specifically, taking the feedback charge signal QR corresponding to the zero temperature coefficient reference voltage output by the feedback module 20 as an example, assuming that the first voltage signal Vbep is a negative temperature coefficient voltage and the first voltage difference VBE is a positive temperature coefficient voltage, and the zero temperature coefficient reference voltage, the first voltage signal Vbep, and the first voltage difference VBE satisfy the following relationship: Vdac=Vbep+2*VBE

[0153] In this case, it is necessary to select three of the n charge feedback submodules 21 to operate in order to output a feedback charge signal QR corresponding to the zero temperature coefficient reference voltage. For example, referring to FIG24 , the charge feedback submodule 21a outputs a charge amount QR = Vbep * Cf based on the first voltage signal Vbep, the charge feedback submodule 21b outputs a charge amount QR = VBE * Cf based on the first voltage difference VBE, and the charge feedback submodule 21c outputs a charge amount QR = VBE * Cf based on the first voltage difference VBE. After superimposing the feedback charge signals QR output by the charge feedback submodules 21a, 21b, and 21c, it can be seen that: QR = (Vbep + 2 * VBE) * Cf = Vdac * Cf

[0154] It can be seen that when the feedback module 20 outputs the feedback charge signal QR according to the first voltage signal Vbep and the first voltage difference VBE, by controlling the working number of the charge feedback sub-module 21 and the switch of the corresponding charge feedback sub-module 21, the feedback charge signal QR corresponding to the zero temperature coefficient reference voltage can be finally output.

[0155] At the same time, it should be noted that, since the capacitance value of each charge feedback submodule 21 has different mismatch capacitance, when the feedback module 20 switches to a different charge feedback submodule 21 to work, the feedback module 20 can be placed in a different charge feedback mode. For example, for the above embodiment of selecting 3 charge feedback submodules 21 to work out of n charge feedback submodules 21, if the number of charge feedback submodules 21 in the feedback module 20 is 5, then selecting 5 charge feedback submodules 21 out of 3 charge feedback submodules 21 has There are 10 combinations of charge feedback modes. That is, the feedback module 20 has 10 charge feedback modes.

[0156] In some embodiments of the present application, each time the feedback module 20 outputs a feedback charge signal QR according to the first voltage signal Vbep, the feedback module 20 switches the current charge feedback mode to another charge feedback mode, so that the feedback module 20 outputs the feedback charge signal QR in different charge feedback modes.

[0157] It should be noted that, as mentioned above, for the first input voltage Vbep, the charge mismatch dQ of the feedback charge signal is mainly affected by the capacitance mismatch. Therefore, in the embodiment of the present application, since each time the feedback module 20 outputs a feedback charge signal QR according to the first voltage signal Vbep, the feedback module 20 switches the current charge feedback mode to another charge feedback mode, so that the feedback module 20 outputs the feedback charge signal QR in different charge feedback modes, the feedback module 20 can output the feedback charge signal QR according to the mismatch capacitance generated by different charge feedback modes, so that in the process of outputting the feedback charge signal QR N times, the mismatch amount of the feedback charge signal QR output by the first voltage signal Vbep generated by different charge feedback modes can be accumulated, and finally the mismatch amount of the feedback charge signal QR in the process of outputting the feedback charge signal QR N times can be quantified by the mismatch capacitance of multiple charge feedback modes. After calibrating the Sigma-Delta modulator, the influence of the mismatch voltage on the Sigma-Delta modulator can be reduced, and ultimately it is beneficial to improve the measurement accuracy of the Sigma-Delta modulator.

[0158] In some embodiments of the present application, each time the feedback module 20 outputs the feedback charge signal QR only once based on the first voltage difference VBE, the charge feedback mode of the feedback module 20 remains unchanged. For example, referring to FIG. 25 , the current voltage output mode of the voltage output module 10 is VM2 mode, and the current charge feedback mode of the feedback module 20 is QM3 mode. After the feedback module 20 outputs the feedback charge signal QR once in the voltage output mode QM3 based on the first voltage difference VBE corresponding to the voltage output mode VM2, the feedback module 20 remains in the QM3 mode, while the voltage output module 10 changes from the VM2 mode to the VM3 mode. That is, the next time the feedback module 20 outputs the feedback charge signal QR, the voltage output mode of the voltage output module 10 is VM3 mode, while the charge feedback mode of the charge feedback module 20 remains QM3.

[0159] It should be noted that, whenever the feedback module 20 outputs a feedback charge signal QR according to the first voltage signal Vbep, the feedback module 20 switches the current charge feedback mode to another charge feedback mode, which is conducive to ensuring that the voltage output module 10 switches to other charge feedback modes; and whenever the feedback module 20 outputs a feedback charge signal QR according to the first voltage difference VBE, the charge feedback mode of the feedback module 20 remains unchanged, which can ensure that when the feedback module 20 outputs the next feedback charge signal QR according to the first voltage signal Vbep, the mismatch amount corresponding to the charge feedback mode is collected, which is conducive to the feedback module 20 outputting at least one feedback charge signal QR according to the first voltage signal Vbep in each charge feedback mode.

[0160] In some embodiments of the present application, after the feedback module 20 outputs the primary feedback charge signal QR based on the first voltage signal Vbep, the feedback module 20 switches the current charge feedback mode to another charge feedback mode. For example, referring to FIG. 26 , the current voltage output mode of the voltage output module 10 is VM2, and the current charge feedback mode of the feedback module 20 is QM3. After the feedback module 20 outputs the primary feedback charge signal QR based on the first voltage signal Vbep corresponding to the voltage output mode VM2, the voltage output mode of the voltage output module 10 remains in VM2, while the charge feedback mode of the feedback module 20 switches to QM4.

[0161] In some embodiments of the present application, the feedback module 20 may switch the current charge feedback mode to another charge feedback mode before the feedback module 20 outputs the primary feedback charge signal QR based on the first voltage signal Vbep. For example, referring to FIG. 27 , before the feedback module 20 outputs the primary feedback charge signal QR based on the first voltage signal Vbep, the feedback module 20 has already switched the charge feedback mode from the QM3 mode to the QM4 mode. Therefore, during the current output of the feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR based on the first voltage signal Vbep in the QM3 mode.

[0162] It should be noted that the feedback module 20 outputs a feedback charge signal QR once according to the first voltage signal Vbep, which may mean that the feedback module 20 outputs a feedback charge signal QR once only according to the first voltage signal Vbep. For example, refer to Figure 26 or Figure 27, the feedback module 20 outputs a feedback charge signal QR once only according to the first voltage signal Vbep; at the same time, it may also mean that the feedback module 20 outputs a feedback charge signal QR once according to the first voltage difference VBE and the first voltage signal Vbep. For example, refer to Figure 28, wherein, after the feedback module 20 outputs a feedback charge signal QR once according to the first voltage signal Vbep and the first voltage difference VBE, the charge feedback mode of the feedback module 20 is switched from QM3 mode to QM4 mode.

[0163] In some embodiments of the present application, for example, for an embodiment in which the feedback charge signal QR can be a positive charge signal or a negative charge signal, after the feedback module 20 outputs the feedback charge signal QR of the first polarity once according to the first voltage signal Vbep, the feedback module 20 switches the current charge feedback mode to the next charge feedback mode; before the feedback module 20 outputs the feedback charge signal QR of the second polarity once according to the first voltage signal Vbep, the feedback module 20 switches the current charge feedback mode to the previous charge feedback mode; wherein the first polarity is opposite to the second polarity, the next charge feedback mode is the charge feedback mode in which the feedback module 20 is when the feedback module 20 outputs the feedback charge signal QR next time, and the previous charge feedback mode is the charge feedback mode in which the feedback module 20 is when the feedback module 20 outputs the feedback charge signal QR of the first polarity last time according to the first voltage signal Vbep.

[0164] As an example, referring to FIG. 29 , when outputting the Mth feedback charge signal QR, the feedback module 20 is in the charge feedback mode QM3. The feedback module 20 outputs a positive feedback charge signal QR once according to the first voltage signal Vbep in the charge feedback mode QM3. After outputting a positive feedback charge signal QR once, the feedback module 20 switches the charge feedback mode QM3 to the charge feedback mode QM4. When outputting the M+1th feedback charge signal QR, since the negative feedback charge signal QR is output according to the first voltage signal Vbep this time, the charge feedback signal QR is outputted in the charge feedback mode QM4. Before the negative feedback charge signal QR is output, the feedback module 20 switches from the charge feedback mode QM4 to the charge feedback mode QM3. In the charge feedback mode QM3, the feedback module 20 outputs the negative feedback charge signal QR according to the first voltage signal Vbep. When outputting the M+2th feedback charge signal QR, the feedback module 20 continues to output the positive feedback charge signal QR once in the charge feedback mode QM3 according to the first voltage signal Vbep. After outputting the positive feedback charge signal QR once, the feedback module 20 switches the charge feedback mode QM3 to the charge feedback mode QM4.

[0165] As another example, referring to FIG30 , when outputting the Mth feedback charge signal QR, the feedback module 20 is in the charge feedback mode QM3, and the feedback module 20 outputs a positive feedback charge signal QR in the charge feedback mode QM3 according to the first voltage signal Vbep; when outputting the M+1th feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR in the charge feedback mode QM4 according to the first voltage difference VBE; when outputting the M+2th feedback charge signal QR, the feedback module 20 outputs a negative feedback charge signal QR in the charge feedback mode QM3 according to the first voltage signal Vbep; and when outputting the M+3th feedback charge signal, the feedback module 20 continues to output a positive feedback charge signal QR in the charge feedback mode QM3 according to the first voltage signal Vbep.

[0166] 29 and 30 , it can be seen that, in the process of outputting the Mth feedback charge signal QR and the M+1th (M+2th) feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR of the first polarity and the second polarity respectively in the same charge feedback mode (QM3) according to the first voltage signal Vbep, thereby offsetting the mismatch of the feedback charge signal QR in the same charge feedback mode through the positive and negative charges; and in the process of outputting the M+2th (M+3th) feedback charge signal QR, the feedback module 20 continues to output the feedback charge signal QR of the first polarity according to the first voltage signal Vbep in the charge feedback mode QM3, thereby facilitating the accumulation of the charge mismatch of the first polarity (or second polarity) corresponding to the first voltage signal Vbep of all charge feedback modes, thereby avoiding the phenomenon that the mismatch of some charge feedback modes is not accumulated due to the offset of positive and negative charges, thereby failing to perform gain calibration on the Sigma-Delta modulator.

[0167] In some embodiments of the present application, the feedback module 20 switches the current charge feedback mode to the next charge feedback mode according to a fifth preset order based on multiple charge feedback modes; the feedback module 20 switches the current charge feedback mode to the previous charge feedback mode according to a sixth preset order based on multiple charge feedback modes; wherein the fifth preset order is opposite to the sixth preset order.

[0168] For example, referring to FIG. 29 or FIG. 30 , when the feedback module 20 needs to switch to the next charge feedback mode, the charge feedback mode switches from the current charge feedback mode to the next charge feedback mode in the order of QM1-QM8; conversely, when the feedback module 20 needs to switch to the previous charge feedback mode, the feedback module 20 switches from the current charge feedback mode to the next charge feedback mode in the order of QM8-QM1, so that the feedback module 20 switches to other charge feedback modes during the process of the feedback module 20 outputting the feedback charge signal QR N times.

[0169] For another example, referring to FIG31 , when the feedback module 20 needs to switch to the next charge feedback mode, the voltage output module 10 switches the current charge feedback mode QM1 to the next charge feedback mode QM2 in the clockwise order of QM1-QM12; referring to FIG32 , when the feedback module 20 needs to switch to the previous charge feedback mode, the feedback block switches the current charge feedback mode QM2 to the previous charge feedback mode QM1 in the counterclockwise order of QM12-QM1.

[0170] In some embodiments of the present application, referring to FIG. 33 , the charge feedback mode of the feedback module 20 includes a first polarity charge feedback mode and a second polarity charge feedback mode. The first polarity charge feedback mode is a charge feedback mode in which the feedback module 20 outputs a feedback charge signal QR of a first polarity according to the first voltage signal Vbep, and the second polarity charge feedback mode is a charge feedback mode in which the feedback module 20 outputs a feedback charge signal QR of a second polarity according to the first voltage signal Vbep.

[0171] Specifically, after the feedback module 20 outputs a feedback charge signal QR of the first polarity according to the first voltage signal Vbep, the feedback module 20 switches the current charge feedback mode to the next first polarity charge feedback mode. The next first polarity charge feedback mode is the charge feedback mode in which the feedback module 20 is when the feedback module 20 outputs the feedback charge signal QR of the first polarity according to the first voltage signal Vbep the next time.

[0172] For example, referring to FIG34 , when outputting the Mth feedback charge signal QR, the feedback module 20 is in the first polarity charge feedback mode QM1, and the feedback module 20 outputs the first polarity feedback charge signal QR according to the first voltage signal Vbep in the charge feedback mode QM1; and when outputting the M+ath (a≥1) feedback charge signal QR, the feedback module 20 is in the first polarity charge feedback mode QM2, and the feedback module 20 outputs the first polarity feedback charge signal QR according to the first voltage signal Vbep in the charge feedback mode QM2.

[0173] Conversely, after the feedback module 20 outputs the feedback charge signal QR of the second polarity once according to the first voltage signal Vbep, the feedback module 20 switches the current charge feedback mode to the next second polarity charge feedback mode. The next second polarity charge feedback mode is the charge feedback mode in which the feedback module 20 is next in which the feedback module 20 outputs the feedback charge signal QR of the second polarity according to the first voltage signal Vbep.

[0174] For example, referring to FIG35 , when outputting the Mth feedback charge signal QR, the feedback module 20 is in the second polarity charge feedback mode QM2, and the feedback module 20 outputs the second polarity feedback charge signal QR according to the first voltage signal Vbep in the charge feedback mode QM2; and when outputting the M+bth (b≥1) feedback charge signal QR, the feedback module 20 is in the second polarity charge feedback mode QM3, and the feedback module 20 outputs the second polarity feedback charge signal QR according to the first voltage signal Vbep in the charge feedback mode QM3.

[0175] That is, when the feedback module 20 outputs a feedback charge signal QR of a first polarity based on the first voltage signal Vbep, the feedback module 20 switches to the first polarity charge feedback mode, so that the feedback module 20 can output the feedback charge signal QR of the first polarity based on the first voltage signal Vbep in all charge feedback modes, thereby accumulating the charge mismatch of the first polarity. When the feedback module 20 outputs the feedback charge signal QR of a second polarity based on the first voltage signal Vbep, the output mode of the feedback module 20 switches to the second polarity charge feedback mode, so that the feedback module 20 can output the feedback charge signal QR of the second polarity based on the first voltage signal Vbep in all charge feedback modes, thereby accumulating the charge mismatch of the second polarity, so as to calculate the total charge mismatch and the corresponding capacitance mismatch by subtracting the charge mismatch of the first polarity from the charge mismatch of the second polarity.

[0176] As an exemplary description of the working process of the feedback circuit 100 of the present application, referring to FIG36 , when outputting the M-th feedback charge signal QR, the feedback module 20 is in the first polarity charge feedback mode QM1, and the feedback module 20 outputs the first polarity feedback charge signal QR according to the first voltage signal Vbep in the charge feedback mode QM1; and when outputting the M+1-th feedback charge signal QR, the first polarity charge feedback mode is changed from the QM1 charge feedback mode to the QM2 charge feedback mode. Since the feedback charge signal QR of the second polarity is output this time, the feedback module 20 is in the second polarity charge feedback mode QM1. In the second polarity charge feedback mode QM2, the feedback module 20 outputs a feedback charge signal QR of the second polarity according to the first voltage signal Vbep in the second polarity charge feedback mode QM2. When outputting the M+2th feedback charge signal QR, the second polarity charge feedback mode changes from the QM2 charge feedback mode to the QM3 charge feedback mode. Since the feedback charge signal QR of the first polarity is output this time, the feedback module 20 is in the first polarity charge feedback mode QM2. In the first polarity charge feedback mode QM2, the feedback module 20 outputs the feedback charge signal QR of the second polarity according to the first voltage signal Vbep.

[0177] As another exemplary illustration of the working process of the feedback circuit 100 of the present application, referring to FIG37 , when outputting the Mth feedback charge signal QR, the feedback module 20 is in the second polarity charge feedback mode QM2, and the feedback module 20 outputs the feedback charge signal QR of the first polarity according to the first voltage signal Vbep in the charge feedback mode QM2; and when outputting the M+1th feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR of the first polarity according to the first voltage signal Vbep in the first polarity charge feedback mode QM1; and when outputting the M+2th feedback charge signal QR, the feedback module 20 outputs the feedback charge signal QR of the first polarity according to the first voltage signal Vbep in the second polarity charge feedback mode QM3.

[0178] In some embodiments of the present application, the feedback module 20 switches the current charge feedback mode to the next first polarity charge feedback mode according to a seventh preset order based on multiple charge feedback modes; the feedback module 20 switches the current charge feedback mode to the next first polarity charge feedback mode according to an eighth preset order based on multiple charge feedback modes; wherein the seventh preset order is the same as or opposite to the eighth preset order.

[0179] For example, referring to Figure 36 or Figure 37, when the feedback module 20 needs to switch to the next first polarity charge feedback mode, the feedback module 20 switches the current charge feedback mode to the next charge feedback mode in the order of QM1-QM8; conversely, when the feedback module 20 needs to switch to the next second polarity charge feedback mode, the feedback module 20 can switch the current charge feedback mode to the next charge feedback mode in the order of QM8-QM1.

[0180] In order to better implement the feedback circuit 100 in the embodiment of the present application, based on the feedback circuit 100, the present application further provides a voltage detection circuit. The voltage detection circuit includes the feedback circuit 100 as described in any of the above embodiments. As an example, referring to FIG38 , the voltage detection circuit may include:

[0181] The voltage input circuit 200 is used to output N times the charge signal Qin to be measured according to the voltage signal Vin to be measured;

[0182] In the feedback circuit 100 described in any of the above embodiments, the first voltage difference VBE has a first temperature coefficient, the first voltage signal Vbep has a second temperature coefficient, one of the first temperature coefficient and the second temperature coefficient is a positive temperature coefficient, and the other is a negative temperature coefficient;

[0183] The metering circuit 300 is configured to integrate the N feedback charge signals QR output by the feedback circuit 100 and the N charge signals to be measured Qin output by the voltage input circuit 200, and determine the charge signal to be measured Qin corresponding to the voltage signal to be measured Vin based on the first and second decimals, the first polarity feedback charge signals QR, and the second polarity feedback charge signals QR.

[0184] The first number is the number of times the feedback module 20 outputs the first polarity feedback charge signal QR, and the second number is the number of times the feedback module 20 outputs the second polarity feedback charge signal QR, where the first polarity is opposite to the second polarity.

[0185] The temperature coefficient of the feedback charge signal QR is zero, and the integration result of the measurement circuit 300 on the N feedback charge signals QR and the N to-be-measured charge signals Qin is smaller than the predetermined voltage Vref.

[0186] It should be noted that when the feedback circuit 100 is used for voltage detection, the feedback charge signal QR output by the feedback module 20 is a charge signal generated by a reference voltage with a zero temperature coefficient. In other words, the temperature coefficient of the feedback charge signal QR is zero, thereby preventing inaccurate voltage measurements caused by the influence of ambient temperature during voltage measurement. Furthermore, since the integration result of the N feedback charge signals QR and the N to-be-measured charge signals Qin by the metering circuit 300 is less than the preset voltage Vref, if the charge amount of each feedback charge signal QR output by the feedback circuit 100 is equal, the to-be-measured charge signal Qin corresponding to the to-be-measured voltage signal Vin can be calculated according to the following formula:

[0187] Wherein, N is the number of times the voltage input circuit 200 outputs the charge signal Qin to be measured, QN1 is the charge amount of the charge signal Qin to be measured, QN2 is the charge amount of the feedback charge signal QR output by the feedback circuit 100 each time, Y1 is the number of times the feedback module 20 outputs the first polarity feedback charge signal QR, Y2 is the number of times the feedback module 20 outputs the second polarity feedback charge signal QR, and Y3 is the number of times the feedback module 20 outputs a charge amount of 0.

[0188] It can be seen that the charge signal Qin to be measured can be calculated according to the above formula, and after obtaining the charge signal Qin to be measured, the voltage signal Vin to be measured can be calculated, and finally the purpose of voltage measurement is achieved.

[0189] In some embodiments of the present application, referring to FIG. 39 , the metering circuit 300 includes an integration module 310, a comparison module 320, and a counting module 330. Specifically, the integration module 310 is configured to integrate the feedback charge signal QR and the charge signal to be measured Qin and output an integrated voltage signal VI. The comparison module 320 is configured to compare the integrated voltage signal VI with a preset voltage Vref and output a control signal VC after the integrator integrates the charge signal to be measured Qin and / or the feedback charge signal QR at least once. The control signal VC is configured to control the feedback module 20 to output a feedback charge signal QR of a first polarity or a feedback charge signal QR of a second polarity, so that the integration result of the integration module 310 integrating the feedback charge signal QR and the charge signal to be measured N times is less than the preset voltage Vref. The counting module 330 is configured to record the number of times the feedback module 20 outputs the feedback charge signal QR of the first polarity and the number of times the feedback module 20 outputs the feedback charge signal QR of the second polarity according to the control signal VC, so as to obtain a first count and a second count and calculate the voltage value of the voltage to be measured.

[0190] As an example, refer to FIG. 40 , which shows a circuit structure diagram of a voltage measurement circuit in an embodiment of the present application. In particular, the feedback circuit 100 only shows a partial circuit structure of the feedback module 20, and omits the counting module 330 of the metering circuit 300. This figure is used as an example to illustrate the process of measuring voltage in the present application.

[0191] At the beginning of the measurement, switches S7 and S8 are closed, and switch S1 、S4 Close, switch S5 、S6 Disconnect, switches S13 and S15 are disconnected, switches S14 and S16 are closed, switches S01 and S02 are disconnected, switch S03 is closed, and the voltage signal Vin to be measured is applied to the capacitor cs1. 、cs2 Charging; waiting capacitor cs1 、cs2 After charging is completed, switch S1 、S2 Disconnect, switch S5 、S6 Close, switches S13 and S15 are closed, switches S14 and S16 are open, and capacitor cs1 、cs2 Due to the change in voltage at both ends, the charge signal Qin to be measured is released, and its size is (V0-Vcm)*cs, where cs is cs1 、cs2 The capacitor of the integration module 310 receives the charge signal Qin to be measured, and causes the output signal voltage of the integration module 310 to increase. When the output signal voltage of the integration module 310 is higher than the preset reference voltage, the comparator outputs a high-level control signal VC, and a cycle is completed.

[0192] At the beginning of the next cycle, the voltage input circuit 200 repeats the above-mentioned process of inputting the charge signal Qin to be measured, and the feedback circuit 100 receives the high-level control signal VC output by the comparator in the previous cycle, and controls switches S01, S02 and switch S03, so that the feedback circuit 100 outputs a negatively charged feedback charge signal, thereby reducing the output signal voltage of the integrator. When the output signal voltage of the integration module 310 is lower than the preset reference voltage, the comparator outputs a low-level control signal VC, and a cycle is completed.

[0193] At the beginning of the next cycle, the voltage input circuit 200 repeats the above-mentioned process of inputting the charge signal Qin to be measured, and the feedback circuit 100 receives the low-level control signal VC output by the comparator in the previous cycle, and controls switches S01, S02 and switch S03, so that the feedback circuit 100 outputs a positive feedback charge signal, thereby reducing the output signal voltage of the integrator. When the output signal voltage of the integration module 310 is still lower than the preset reference voltage, the comparator outputs a high-level control signal VC, and a cycle is completed.

[0194] After the above process is repeated multiple times, the charge signal Qin to be measured and the voltage to be measured can be calculated based on the number of feedbacks of the positive and negative feedback charge signals and the number of inputs of the charge signal Qin to be measured.

[0195] In order to better implement the feedback circuit 100 in the embodiment of the present application, the present application further provides a temperature detection circuit based on the feedback circuit 100. Referring to FIG. 41 , FIG. 41 shows a module schematic diagram of the temperature detection circuit in the embodiment of the present application. The temperature detection circuit includes:

[0196] In the feedback circuit 100 described in any of the above embodiments, the first voltage difference VBE has a first temperature coefficient, the first voltage signal Vbep has a second temperature coefficient, one of the first temperature coefficient and the second temperature coefficient is a positive temperature coefficient, and the other is a negative temperature coefficient;

[0197] The metering circuit 300 is configured to integrate the N feedback charge signals QR output by the feedback circuit 100 and determine a voltage value of a first voltage difference VBE based on the first and second integrals and a reference voltage.

[0198] The first number is the number of times the feedback module 20 outputs the feedback charge signal QR based on the first voltage signal Vbep, and the second number is the number of times the feedback module 20 outputs the feedback charge signal QR based on the first voltage difference VBE;

[0199] The reference voltage is a zero temperature coefficient voltage determined based on the first voltage signal Vbep and the first voltage difference VBE. The integration result of the N-times feedback charge signal QR by the metering circuit 300 is less than the preset voltage Vref.

[0200] It should be noted that since the first voltage difference VBE and the first voltage signal Vbep have temperature coefficients, the corresponding temperature can be calculated by measuring the first voltage difference VBE or the first voltage signal Vbep. Specifically, the feedback module 20 outputs the feedback charge signal QR based on the first voltage signal Vbep, and the feedback module 20 outputs the feedback charge signal QR based on the first voltage difference VBE, which can be calculated according to the following formulas: QX1 = -a1*Vbep*C QX2 = b1*VBE*C Vref = a1*Vbep+b1*VBE

[0201] Among them, QX1 is the charge amount of the feedback charge signal QR output by the feedback module 20 based on the first voltage signal Vbep, QX2 is the charge amount of the feedback charge signal QR output by the feedback module 20 based on the first voltage difference VBE, C is the capacitance value of the corresponding capacitor, Vref is the zero temperature coefficient reference voltage determined by the first voltage signal Vbep and the first voltage difference VBE, and a1 and b1 are coefficients corresponding to the zero temperature coefficient reference voltage.

[0202] Since the integration result of the measurement circuit 300 for the N times of the charge signal Qin to be measured is less than the preset voltage Vref, it can be known that: QX1*X1+QX2*X2=0

[0203] Here, X1 is the number of times the feedback module 20 outputs the feedback charge signal QR based on the first voltage signal Vbep, and X2 is the number of times the feedback module 20 outputs the feedback charge signal QR based on the first voltage difference VBE.

[0204] Convert the above formula: QX2*X2+QX1*X1=-QX1*X1+QX1*X1 QX2(X1+X2)=X1(-QX1+QX2)

[0205] Substituting the reference voltage calculation formula, QX1 and QX2 calculation formula into the above formula, we can know: b1*VBE*C(X1+X2)=X1(Vref*C)

[0206] Therefore, the first voltage signal Vbep can be calculated according to the following formula:

[0207] It can be seen that by recording the number of times the feedback module 20 outputs the feedback charge signal QR based on the first voltage signal Vbep and the number of times the feedback module 20 outputs the feedback charge signal QR based on the first voltage difference VBE, as well as the zero temperature coefficient voltage Vref determined by the first voltage signal Vbep and the first voltage difference VBE, the size of the first voltage difference VBE can be obtained, thereby calculating the corresponding ambient temperature.

[0208] It is understandable that the corresponding ambient temperature can be calculated by measuring the magnitude of the first voltage signal Vbep.

[0209] As an example, refer to FIG. 42 , which shows a circuit structure diagram of a voltage measurement circuit in an embodiment of the present application. In this diagram, only a partial circuit structure of the feedback module 20 is shown in the feedback circuit 100. This diagram is used as an example to illustrate the process of measuring voltage in the present application.

[0210] When temperature measurement begins, switches S13 and S15 are opened, and switches S14 and S16 are closed. By controlling switches S01, S02, and S03, the feedback circuit 100 outputs a negative feedback charge signal, thereby reducing the output signal voltage of the integrator. When the output signal voltage of the integration module 310 is lower than the preset reference voltage, the comparator outputs a low-level control signal VC, completing a cycle.

[0211] At the beginning of the next cycle, the feedback circuit 100 receives the low-level control signal VC output by the comparator in the previous cycle and controls switches S01, S02, and S03, causing the feedback circuit 100 to output a positive feedback charge signal. This increases the output signal voltage of the integrator. When the output signal voltage of the integration module 310 is higher than the preset reference voltage, the comparator outputs a high-level control signal VC, completing a cycle.

[0212] After the above process is repeated multiple times, the first voltage signal Vbep (or the first voltage difference VBE) can be calculated according to the number of feedbacks of the positive and negative feedback charge signals, thereby obtaining the corresponding temperature value.

[0213] The present application also provides a chip including the voltage detection circuit or temperature detection circuit described above. An integrated circuit (IC) is also referred to as a chip, and the chip may be, but is not limited to, a SOC (System on Chip) chip or a SIP (System in Package) chip.

[0214] The embodiment of the present application also provides an electronic device, which includes a device body and a chip as described above provided in the device body. The electronic device can be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a car charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a stylus, a true wireless headset, a car central control panel, a car, a smart wearable device, a mobile terminal, and a smart home device. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, and cervical massagers. Mobile terminals include, but are not limited to, smartphones, laptops, tablet computers, and POS (point of sales terminal) machines. Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart sweepers, and smart lights.

[0215] The above is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A feedback circuit, characterized in that, The feedback circuit is used to output N feedback charge signals, where N is an integer greater than 1. The feedback circuit includes: A voltage output module for outputting a first voltage signal and a second voltage signal, with a first voltage difference between the first voltage signal and the second voltage signal; A feedback module for outputting a feedback charge signal according to the first voltage signal and / or the first voltage difference; Wherein, the first voltage signal has a first mismatch voltage, the voltage output module has multiple voltage output modes, and the first mismatch voltages of the first voltage signal output by the voltage output module in at least two of the voltage output modes are not equal; Whenever the feedback module outputs a feedback charge signal according to the first voltage difference once, the voltage output module switches the current voltage output mode to another voltage output mode, so that the feedback module outputs the feedback charge signal according to the first voltage differences generated by different voltage output modes.

2. The feedback circuit according to claim 1, wherein Whenever the feedback module outputs a feedback charge signal according to the first voltage signal only once, the voltage output mode of the voltage output module remains unchanged.

3. The feedback circuit according to claim 1, wherein After the feedback module outputs a feedback charge signal according to the first voltage difference once, the voltage output module switches the current voltage output mode to another voltage output mode; or Before the feedback module outputs a feedback charge signal according to the first voltage difference once, the voltage output module switches the current voltage output mode to another voltage output mode.

4. The feedback circuit according to claim 3, wherein After the feedback module outputs a feedback charge signal of a first polarity according to the first voltage difference once, the voltage output module switches the current voltage output mode to the next voltage output mode; Before the feedback module outputs a feedback charge signal of a second polarity according to the first voltage difference once, the voltage output module switches the current voltage output mode to the previous voltage output mode; Wherein, the first polarity is opposite to the second polarity, the next voltage output mode is the voltage output mode in which the voltage output module is when the feedback module outputs the feedback charge signal next time, and the previous voltage output mode is the voltage output mode in which the voltage output module is when the feedback module outputs a feedback charge signal of the first polarity according to the first voltage difference last time.

5. The feedback circuit according to claim 4, wherein The voltage output module switches the current voltage output mode to the next voltage output mode in a first preset order based on the multiple voltage output modes; The voltage output module switches the current voltage output mode to the previous voltage output mode in a second preset order based on the multiple voltage output modes; Wherein, the first preset order is opposite to the second preset order.

6. The feedback circuit according to claim 3, characterized in that After the feedback module outputs a feedback charge signal of a first polarity according to the first voltage difference once, the voltage output module switches the current voltage output mode to the next first-polarity voltage output mode; After the feedback module outputs the feedback charge signal of the second polarity according to the first voltage difference, the voltage output module switches the current voltage output mode to the next voltage output mode of the second polarity; Wherein, the first polarity is opposite to the second polarity, and the next first polarity voltage output mode is the voltage output mode in which the voltage output module is located when the feedback module outputs the feedback charge signal of the first polarity according to the first voltage difference next time; The next second polarity voltage output mode is the voltage output mode in which the voltage output module is located when the feedback module outputs the feedback charge signal of the second polarity according to the first voltage difference next time.

7. The feedback circuit according to claim 6, wherein The voltage output module switches the current voltage output mode to the next first polarity voltage output mode based on the multiple voltage output modes in a third preset order; The voltage output module switches the current voltage output mode to the next second polarity voltage output mode based on the multiple voltage output modes in a fourth preset order; Wherein, the third preset order is the same as or opposite to the fourth preset order.

8. The feedback circuit according to claim 1, wherein The voltage output module includes a plurality of voltage generation sub-modules; Each voltage generation sub-module is used to output a first voltage signal and a second voltage signal. The first mismatch voltages of the first voltage signals output by each voltage generation sub-module are not equal, and the second mismatch voltages of the second voltage signals output by each voltage generation sub-module are not equal; The voltage output module outputs the first voltage signal and the second voltage signal based on different voltage generation sub-modules in different voltage output modes.

9. The feedback circuit according to claim 1, wherein The voltage output module includes M1 bias current sources, M1 first switches, M1 second switches, N1 third switches, N1 fourth switches, and N1 triodes; The first switches correspond to the bias current sources one by one. The first end of each first switch is connected to the corresponding bias current source, and the second end of each first switch is connected to the first ends of N1 third switches; The third switches correspond to the triodes one by one. The second end of each third switch is connected to the corresponding triode; The second switches correspond to the bias current sources one by one. The first end of each second switch is connected to the corresponding bias current source, and the second end of each second switch is connected to N1 fourth switches; The fourth switches correspond to the triodes one by one. The second end of each fourth switch is connected to the corresponding triode; Wherein, when the voltage output module is in a certain voltage output mode, any M2 of the M1 first switches are closed, and any N2 of the N1 third switches are closed to generate the first voltage signal at the first node between the first switch and the third switch; Moreover, any M1 - M2 of the M1 first switches are closed, and any N1 - N2 of the N1 third switches are closed, so as to generate the second voltage signal at the second node between the second switch and the fourth switch.

10. The feedback circuit according to claim 1, characterized in that, The feedback module has multiple charge feedback modes, and the mismatch capacitances of the feedback module in at least two of the charge feedback modes are not equal; Whenever the feedback module outputs the feedback charge signal once according to the first voltage signal, the feedback module switches the current charge feedback mode to another charge feedback mode, so that the feedback module outputs the feedback charge signal in different charge feedback modes.

11. A voltage detection circuit, characterized in that, Comprising the feedback circuit according to any one of claims 1 to 10.

12. A temperature detection circuit, characterized in that, Comprising: The feedback circuit according to any one of claims 1 to 10, wherein the first voltage difference has a first temperature coefficient, the first voltage signal has a second temperature coefficient, and one of the first temperature coefficient and the second temperature coefficient is a positive temperature coefficient, and the other is a negative temperature coefficient; A metering circuit for integrating N feedback charge signals output by the feedback circuit and determining the voltage value of the first voltage difference according to the first number, the second number, and the reference voltage; Wherein, the first number is the number of times the feedback module outputs the feedback charge signal based on the first voltage signal, and the second number is the number of times the feedback module outputs the feedback charge signal based on the first voltage difference; The reference voltage is a zero - temperature - coefficient voltage determined based on the first voltage signal and the first voltage difference, and the integration result of the metering circuit for N feedback charge signals is less than a preset voltage.

13. A chip, characterized in that, Comprising: The voltage detection circuit according to claim 11; And / or The temperature detection circuit according to claim 12.

14. An electronic device, characterized in that, Comprising a device body and a chip provided on the device body as described in claim 13 above.

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