Voltage stabilizing circuit and integrated circuit chip

Abstract

The embodiment of the invention provides a voltage stabilizing circuit and an integrated circuit chip. The voltage stabilizing circuit comprises a current mirror module, an amplification module, a feedback module and a switch module, the first end of the current mirror module is connected with a first power supply, the second end of the current mirror module is connected with the first input end of the amplification module, and the third end of the current mirror module is connected with the second input end of the amplification module; the third input end of the amplification module is connected with the third end of the feedback module; the output end of the amplification module is connected with the second end of the feedback module and grounded; the first end of the switch module is connected with a first power supply, the control end of the switch module is connected with the third end of the current mirror module, the second end of the switch module is connected with the first end of the feedback module, and the second end of the switch module is used for outputting output voltage; the third end of the feedback module is used for generating feedback voltage and controlling output voltage through the feedback voltage. The output voltage of any magnitude can be output through the feedback module, and the output voltage is clamped so that the output voltage can be stable.

Description

Technical Field

[0001] The present application relates to the field of integrated circuits, and in particular to a voltage stabilizing circuit and an integrated circuit chip. Background Art

[0002] In integrated circuit design, low-dropout linear regulators are often used to provide stable reference voltages and power management. Common linear regulators usually include a bandgap reference module that provides a constant reference voltage, and use the loop clamp of the op amp and the resistor feedback network to generate a stable output voltage. The accuracy of the output voltage is closely related to the accuracy of the bandgap reference.

[0003] In the prior art, the structure of a linear regulator usually includes an operational amplifier and a bandgap reference circuit, which consumes a large area and power. In addition, the output voltage of the regulator is determined by the process, and it is impossible to output a reference voltage of any size. Summary of the invention

[0004] The embodiments of the present application provide a voltage stabilizing circuit and an integrated circuit chip to output a reference voltage of any magnitude.

[0005] In a first aspect, an embodiment of the present application provides a voltage stabilizing circuit, comprising: a current mirror module, an amplification module, a feedback module and a switch module;

[0006] A first end of the current mirror module is connected to the first power supply, a second end of the current mirror module is connected to the first input end of the amplification module, a third end of the current mirror module is connected to the second input end of the amplification module, and the current mirror module is used to output equal currents to the first output end and the second input end of the amplification module;

[0007] The third input terminal of the amplification module is connected to the third terminal of the feedback module, and the output terminal of the amplification module is connected to the second terminal of the feedback module and is grounded;

[0008] The first end of the switch module is connected to the first power supply, the control end of the switch module is connected to the third end of the current mirror module, the second end of the switch module is connected to the first end of the feedback module, and the second end of the switch module is used to output the output voltage;

[0009] The third terminal of the feedback module is used to generate a feedback voltage, and the output voltage is controlled by the feedback voltage.

[0010] In one embodiment, the amplification module includes a positive temperature unit and a negative temperature unit;

[0011] The first end of the positive temperature unit is the first input end of the amplifying module, the second end of the positive temperature unit is the second input end of the amplifying module, the third end of the positive temperature unit is the second end of the amplifying module, the positive temperature unit is grounded, and the fourth end of the positive temperature unit is connected to the first end of the negative temperature unit;

[0012] The first end of the negative temperature unit is connected to the third end of the feedback module, and the second end of the negative temperature unit is grounded;

[0013] The positive temperature unit is used to provide a positive temperature current to the feedback module to form a positive temperature voltage, and the negative temperature unit is used to provide a negative temperature voltage to the feedback module. The output voltage is the sum of the positive temperature voltage and the negative temperature voltage. The feedback module is used to adjust the positive temperature voltage and the negative temperature voltage to control the output voltage so that the temperature coefficient of the output voltage is adjustable.

[0014] In one embodiment, the feedback module includes a first resistor and a second resistor;

[0015] The first end of the first resistor is used to output the output voltage, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is grounded;

[0016] The resistance values ​​of the first resistor and the second resistor are variable.

[0017] In one embodiment, the positive temperature unit includes a first switch tube, a third resistor and a second switch tube;

[0018] The first end of the first switch tube is connected to the second end of the current mirror module, the second end of the first switch tube is grounded, and the third end of the first switch tube is connected to the third end of the second switch tube;

[0019] The first end of the second switch tube is connected to the third end of the current mirror module, and the second end of the second switch tube is grounded through the first resistor.

[0020] In one embodiment, the negative temperature unit is a third switch tube;

[0021] The first end of the third switch tube is connected to the third end of the second switch tube and the third end of the feedback module, the first end of the third switch tube is connected to the third end of the third switch tube, and the second end of the third switch tube is grounded.

[0022] In one of the embodiments, the voltage stabilization circuit further includes a buffer;

[0023] The first end of the buffer is connected to the fourth end of the current mirror module, and the second end of the buffer is connected to the control end of the switch module;

[0024] The buffer is used to perform impedance matching between the first power source and the load.

[0025] In one embodiment, the current mirror module includes a fifth switch tube and a sixth switch tube;

[0026] A first end of the fifth switch tube is connected to the first power supply, a second end of the fifth switch tube is connected to the first input end of the amplification module, and a third end of the fifth switch tube is connected to the third end of the sixth switch tube;

[0027] A first end of the sixth switch tube is connected to the first power supply, and a second end of the sixth switch tube is connected to the second input end of the amplification module;

[0028] The fifth switch tube and the sixth switch tube are used to ensure that the currents at the first input terminal and the second input terminal of the amplification module are equal.

[0029] In one embodiment, the current mirror module further includes a seventh switch tube and an eighth switch tube;

[0030] The first end of the seventh switch tube is connected to the second end of the fifth switch tube, the second end of the seventh switch tube is connected to the first input end of the amplification module, and the third end of the seventh switch tube is connected to the third end of the eighth switch tube;

[0031] The first end of the eighth switch tube is connected to the second end of the sixth switch tube, and the second end of the eighth switch tube is connected to the second input end of the amplification module.

[0032] In one embodiment, the positive temperature unit further includes a seventh switch tube and an eighth switch tube;

[0033] The first end of the seventh switch tube is connected to the second end of the current mirror module, the second end of the seventh switch tube is connected to the first end of the first switch tube, and the third end of the seventh switch tube is connected to the third end of the eighth switch tube;

[0034] The first end of the eighth switch tube is connected to the third end of the current mirror module, and the second end of the eighth switch tube is connected to the first end of the second switch tube.

[0035] In a second aspect, an embodiment of the present application further provides an integrated circuit chip, comprising any of the above-mentioned voltage stabilizing circuits.

[0036] The embodiment of the present application provides a voltage stabilizing circuit and an integrated circuit chip, the voltage stabilizing circuit includes: a current mirror module, an amplifying module, a feedback module and a switch module; the first end of the current mirror module is connected to the first power supply, the second end of the current mirror module is connected to the first input end of the amplifying module, the third end of the current mirror module is connected to the second input end of the amplifying module, and the current mirror module is used to output equal currents to the first output end and the second input end of the amplifying module; the third input end of the amplifying module is connected to the third end of the feedback module, the output end of the amplifying module is connected to the second end of the feedback module and is grounded; the first end of the switch module is connected to the first power supply, the control end of the switch module is connected to the third end of the current mirror module, the second end of the switch module is connected to the first end of the feedback module, and the second end of the switch module is used to output an output voltage; the third end of the feedback module is used to generate a feedback voltage, and the output voltage is controlled by the feedback voltage. The present application can output an output voltage of any size by adjusting the feedback module, the feedback module and the amplifying module clamp the output voltage to stabilize the output voltage, the circuit structure of the present application is simple, and the occupied area is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] Figure 1 A schematic diagram of a linear regulator provided in this application;

[0039] Figure 2 A schematic diagram of the structure of a voltage stabilizing circuit provided in one embodiment of the present application;

[0040] Figure 3 A schematic diagram of the structure of a voltage stabilizing circuit provided in one embodiment of the present application;

[0041] Figure 4 A schematic diagram of the structure of a voltage stabilizing circuit provided in another embodiment of the present application.

[0042] Reference numerals:

[0043] 210, current mirror module; 220, amplifier module; 230, feedback module; 240, buffer; 221, positive temperature unit; 222, negative temperature unit; R1, first resistor; R2, second resistor; R3, third resistor; Q1, first switch tube; Q2, second switch tube; Q3, third switch tube; Q4, switch module; Q5, fifth switch tube; Q6, sixth switch tube; Q7, seventh switch tube; Q8, eighth switch tube.

[0044] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0046] First, the terms involved in this application are explained:

[0047] Offset voltage: (Vos) is the differential voltage required to be applied to the output when the input signal is zero;

[0048] Error Amplifier: (EA) An amplifier used to process and amplify the error signal;

[0049] Bandgap Reference Circuit: (Bandgap Reference, BG) is a circuit that provides a stable voltage reference, usually used in power management;

[0050] Low Dropout Regulator: (Low Dropout Regulator, LDO) is a regulator that can work effectively under a small input-output voltage difference;

[0051] Proportional To Absolute Temperature (PTAT) circuit: A circuit that generates a voltage or current signal that is proportional to the absolute temperature.

[0052] Complementary To Absolute Temperature (CTAT) is a circuit that generates a voltage or current signal that is inversely proportional to the absolute temperature.

[0053] Cascode Configuration: (Cascade) An electronic circuit design, mainly used in the design of amplifiers and current sources, which improves the performance and stability of the circuit by connecting two transistors in series;

[0054] Buffer Amplifier: (BUFFER) is used in isolation circuits to provide signal amplification without changing the signal characteristics.

[0055] Figure 1 A schematic diagram of a linear regulator provided in this application, such as Figure 1 As shown, the linear regulator includes a bandgap reference circuit and an LDO circuit. The bandgap reference circuit relies on the temperature characteristics related to the transistor. The operational amplifier clamp generates a PTAT current, that is, a positive temperature current. This current flows through the resistor R15 to generate a PAPT voltage, which is superimposed on the CTAT voltage (negative temperature voltage) on the transistor Q6 to realize a reference voltage that is independent of temperature.

[0056]

[0057] Wherein, Vos1 is the first offset voltage, Vos2 is the second offset voltage, VDD is the output reference voltage, and β is usually a value less than 1. , and the resistor R14 is smaller than R15. The above BG and LDO structure amplifies the offset of the bandgap reference circuit op amp twice and sends it to the output, resulting in a large deviation at the output. In addition, the linear regulator circuit includes an operational amplifier and a bandgap reference circuit, which consumes a large area and power consumption; the output reference voltage is determined by the process, and it is impossible to output a reference voltage of any size.

[0058] In combination with the above scenario, it can be seen that in the prior art, the output voltage of the voltage regulator is determined by the process, and it is impossible to output a reference voltage of any size.

[0059] The voltage stabilizing circuit provided by the present application includes: a current mirror module, an amplifying module, a feedback module and a switch module; the first end of the current mirror module is connected to the first power supply, the second end of the current mirror module is connected to the first input end of the amplifying module, the third end of the current mirror module is connected to the second input end of the amplifying module, and the current mirror module is used to output equal currents to the first output end and the second input end of the amplifying module; the third input end of the amplifying module is connected to the third end of the feedback module, and the output end of the amplifying module is connected to the second end of the feedback module and grounded; the first end of the switch module is connected to the first power supply, the control end of the switch module is connected to the third end of the current mirror module, the second end of the switch module is connected to the first end of the feedback module, and the second end of the switch module is used to output an output voltage; the third end of the feedback module is used to generate a feedback voltage, and the output voltage is controlled by the feedback voltage. The present application can output an output voltage of any size by adjusting the feedback module, and the feedback module and the amplifying module clamp the output voltage to stabilize the output voltage. The circuit structure of the present application is simple and occupies a small area.

[0060] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0061] The present application embodiment provides a voltage stabilizing circuit, such as Figure 2 As shown, Figure 2 The present invention is a schematic diagram of the structure of a voltage stabilizing circuit provided in an embodiment of the present application, and the voltage stabilizing circuit includes: a current mirror module 210, an amplifying module 220, a feedback module 230 and a switch module Q4; a first end of the current mirror module 210 is connected to a first power supply, a second end of the current mirror module 210 is connected to a first input end of the amplifying module 220, a third end of the current mirror module 210 is connected to a second input end of the amplifying module 220, and the current mirror module 210 is used to output equal currents to a first output end and a second input end of the amplifying module 220; a third input end of the amplifying module 220 is connected to a third end of the feedback module 230, and an output end of the amplifying module 220 is connected to a second end of the feedback module 230 and is grounded; a first end of the switch module is connected to a first power supply, a control end of the switch module is connected to a third end of the current mirror module, a second end of the switch module is connected to a first end of the feedback module, and a second end of the switch module is used to output an output voltage; a third end of the feedback module 230 is used to generate a feedback voltage, and control the output voltage through the feedback voltage.

[0062] Specifically, the current mirror module 210 is used to provide current to the amplifier module 220. The amplifier module 220 receives the current from the current mirror module 210 and adjusts it according to the feedback voltage of the feedback module 230. The output of the amplifier module 220 is fed back to the feedback module 230 to achieve closed-loop control. The amplifier module 220 and the feedback module 230 form a negative feedback system, and the output voltage is stabilized by clamping the output voltage. The feedback module 230 is used to detect the output voltage and generate a feedback voltage. The feedback module 230 can adjust the gain of the amplifier module 220 to stabilize the output voltage. The feedback module 230 can control the magnitude of the output voltage by adjusting the gain of the amplifier module 220.

[0063] In one embodiment, the feedback module 230 is a resistor divider or other feedback network.

[0064] In one embodiment, if Figure 2As shown, the amplification module 220 includes a positive temperature unit 221 and a negative temperature unit 222; the first end of the positive temperature unit 221 is the first input end of the amplification module 220, the second end of the positive temperature unit 221 is the second input end of the amplification module 220, the third end of the positive temperature unit 221 is the second end of the amplification module 220, the positive temperature unit 221 is grounded, and the fourth end of the positive temperature unit 221 is connected to the first end of the negative temperature unit 222; the first end of the negative temperature unit 222 is connected to the third end of the feedback module 230, and the second end of the negative temperature unit 222 is grounded; the positive temperature unit 221 is used to provide a positive temperature current to the feedback module 230 to form a positive temperature voltage, and the negative temperature unit 222 is used to provide a negative temperature voltage to the feedback module 230, and the output voltage is the sum of the positive temperature voltage and the negative temperature voltage. The feedback module 230 is used to adjust the positive temperature voltage and the negative temperature voltage to control the output voltage, so that the temperature coefficient of the output voltage is adjustable.

[0065] In one embodiment, the feedback module 230 includes a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is used to output the output voltage, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded; the resistance values ​​of the first resistor R1 and the second resistor R2 are variable.

[0066] In one embodiment, the positive temperature unit 221 includes a first switch tube Q1, a third resistor R3 and a second switch tube Q2; the first end of the first switch tube Q1 is connected to the second end of the current mirror module 210, the second end of the first switch tube Q1 is grounded, and the third end of the first switch tube Q1 is connected to the third end of the second switch tube Q2; the first end of the second switch tube Q2 is connected to the third end of the current mirror module 210, and the second end of the second switch tube Q2 is grounded through the first resistor R1.

[0067] Specifically, the first switch tube Q1 , the second switch tube Q2 and the third resistor R3 are used to amplify the signal and provide a positive temperature current to the feedback module 230 .

[0068] In one embodiment, the negative temperature unit 222 is a third switch tube Q3; the first end of the third switch tube Q3 is connected to the third end of the second switch tube Q2 and the third end of the feedback module 230, the first end of the third switch tube Q3 is connected to the third end of the third switch tube Q3, and the second end of the third switch tube Q3 is grounded.

[0069] In one embodiment, the first switch tube Q1 and the second switch tube Q2 have different sizes, and the first switch tube Q1 and the third switch tube Q3 have the same size. Optionally, the first switch tube Q1, the second switch tube Q2 and the third switch tube Q3 can be field effect transistors and / or bipolar junction transistors. The present application does not limit the selection of the first switch tube Q1 and the second switch tube Q2, which are set according to actual circuit requirements.

[0070] Specifically, the first switch tube Q1 and the second switch tube Q2 are used as an input pair of tubes. Since the sizes of the first switch tube Q1 and the second switch tube Q2 are different, the third resistor R3 has an attenuation effect on the transconductance (gm) of the second switch tube Q2. The transconductance of the first switch tube Q1 is gm1, and the transconductance of the second switch tube Q2 is gm2, so gm1≠gm2. Therefore, there is a difference in the amplification effect of the first switch tube Q1 and the second switch tube Q2 on small signals. There will be a gain at the output end of the amplification module 220 relative to the input signal. The positive temperature unit 221, the negative temperature unit 222 and the feedback module 230 constitute a negative feedback system. With the addition of a suitable compensation method, the entire system can be stable and the output can be clamped at a certain voltage.

[0071] The voltage across resistor R3 is:

[0072]

[0073] Among them, V BE1 is the base voltage of the first switch tube Q1, V BE2 is the base voltage of the second switch tube Q2. BE1 -V BE2 It is positively correlated with temperature, so the current I 1 is a current that is positively correlated with temperature. Further deduction yields:

[0074]

[0075]

[0076] Where N is the ratio of the emitter area of ​​the second switch tube Q2 to that of the first switch tube Q1. Since the first switch tube Q1 and the third switch tube Q3 are of the same size (have the same area), we have:

[0077]

[0078] The voltage across the second resistor R2 is the base voltage V of the third switch tube Q3. BE3 , because V BE3 It is negatively correlated with the temperature, so the second current I2 is a current negatively correlated with the temperature, that is,

[0079]

[0080] The output voltage of the voltage stabilizing circuit is determined by the base voltage V BE3 The voltage across the first resistor R1 is superimposed to obtain:

[0081]

[0082] Further deduction, the output voltage V OUT have to:

[0083]

[0084]

[0085]

[0086] From the above analysis, we can know that: V BE3 It has the characteristic of being negatively correlated with the temperature coefficient. The current I 2 +I 3 The voltage flowing through the first resistor R1 generates a voltage with a positive correlation characteristic with the temperature coefficient. The superposition of the two can generate an output voltage that is independent of temperature at the output. Secondly, by controlling the ratio of the first resistor R1 and the second resistor R2, the voltage stabilizing circuit can output an adjustable output voltage that is independent of temperature. By adjusting the ratio of the first resistor R1 and the second resistor R2, the magnitude of the output voltage can be controlled, and the voltage stabilizing circuit can output an output voltage of any magnitude. The first resistor R1 and the second resistor R2 form a feedback voltage divider network that can clamp the output voltage.

[0087] The structure of the voltage stabilizing circuit provided in the present application reduces the influence of the offset voltage on the output performance and improves the overall stability and accuracy of the circuit; secondly, the area of ​​the operational amplifier circuit is omitted, and the internal transistor loop is utilized to achieve both temperature compensation and operational amplifier clamping, greatly saving chip area and power consumption.

[0088] In one embodiment, if Figure 3 As shown, Figure 3 This is a structural schematic diagram of a voltage stabilizing circuit provided in one embodiment of the present application, wherein the voltage stabilizing circuit also includes a buffer 240; a first end of the buffer 240 is connected to a first power supply, a second end of the buffer 240 is connected to a first end of a feedback module 230, and a third end of the buffer 240 is connected to a fourth end of a current mirror module 210; the buffer 240 is used to perform impedance matching between the first power supply and the load.

[0089] Specifically, the buffer 240 is used to isolate input and output signals, improve input impedance and low output impedance, achieve effective signal transmission and impedance matching, prevent load changes from adversely affecting the power supply, ensure stability and response speed under different load conditions, and improve the performance and reliability of the voltage stabilization circuit. The switch module is a power tube that can withstand higher current and voltage, is suitable for high-power applications, has a large driving capability compared to ordinary bandgap circuits, and can drive large currents.

[0090] In one embodiment, the voltage stabilizing circuit is connected to the load capacitor CL and the load resistor RL.

[0091] In one embodiment, the current mirror module 210 includes a fifth switch tube Q5 and a sixth switch tube Q6; the first end of the fifth switch tube Q5 is connected to the first power supply, the second end of the fifth switch tube Q5 is connected to the first input end of the amplification module 220, and the third end of the fifth switch tube Q5 is connected to the third end of the sixth switch tube Q6; the first end of the sixth switch tube Q6 is connected to the first power supply, and the second end of the sixth switch tube Q6 is connected to the second input end of the amplification module 220; the fifth switch tube Q5 and the sixth switch tube Q6 are used to determine that the currents at the first input end and the second input end of the amplification module 220 are equal.

[0092] Specifically, the fifth switch tube Q5 and the sixth switch tube Q6 form a basic current mirror structure, ensuring that the first input terminal and the second input terminal of the amplifying module 220 receive equal currents.

[0093] In one embodiment, if Figure 3 As shown, the current mirror module 210 also includes a seventh switch tube Q7 and an eighth switch tube Q8; the first end of the seventh switch tube Q7 is connected to the second end of the fifth switch tube Q5, the second end of the seventh switch tube Q7 is connected to the first input end of the amplification module 220, and the third end of the seventh switch tube Q7 is connected to the third end of the eighth switch tube Q8; the first end of the eighth switch tube Q8 is connected to the second end of the sixth switch tube Q6, and the second end of the eighth switch tube Q8 is connected to the second input end of the amplification module 220.

[0094] Specifically, the fifth switch tube Q5 and the seventh switch tube Q7 are connected in series, and the sixth switch tube Q6 and the eighth switch tube Q8 are connected in series to form a Cascade configuration. This circuit structure can achieve precise current amplitude, provide stable and equal current input for the amplification module 220, improve output impedance and reduce distortion, and improve the performance and reliability of the entire voltage stabilization circuit.

[0095] In one embodiment, the fifth switch tube Q5 and the sixth switch tube Q6 are P-type MOS tubes, and the seventh switch tube Q7 and the eighth switch tube Q8 are N-type MOS tubes.

[0096] In one embodiment, if Figure 4 As shown, Figure 4 A schematic diagram of the structure of a voltage stabilizing circuit provided in another embodiment of the present application. The positive temperature unit also includes a seventh switch tube and an eighth switch tube; the first end of the seventh switch tube is connected to the second end of the current mirror module, the second end of the seventh switch tube is connected to the first end of the first switch tube, and the third end of the seventh switch tube is connected to the third end of the eighth switch tube; the first end of the eighth switch tube is connected to the third end of the current mirror module, and the second end of the eighth switch tube is connected to the first end of the second switch tube.

[0097] Specifically, the first switch tube and the seventh switch tube are connected in series to form a Cascade structure, and the second switch tube and the eighth switch tube are connected in series to form another Cascade structure, forming two Cascade structures. The Cascade structure can increase output impedance and reduce distortion, thereby improving circuit performance and stability.

[0098] The voltage stabilization circuit provided in this application can output a stable and accurate reference voltage, which is crucial for modules with high precision requirements, such as analog-to-digital conversion, digital signal processing, etc. Stable and accurate reference voltage helps improve the performance and accuracy of the entire system and is suitable for various integrated circuit modules, such as temperature sensors, analog front ends, signal processing circuits, power supply management, etc.

[0099] In a second aspect, an embodiment of the present application further provides an integrated circuit chip, comprising any of the above-mentioned voltage stabilizing circuits.

[0100] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of this application is not limited to only one bus or one type of bus.

[0101] The division of units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0102] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0103] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0104] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0105] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A voltage stabilizing circuit, characterized in that: include: Current mirror module, amplifier module, feedback module and switch module; The first end of the current mirror module is connected to the first power supply, the second end of the current mirror module is connected to the first input end of the amplifying module, the third end of the current mirror module is connected to the second input end of the amplifying module, and the current mirror module is used to output equal current to the first output end and the second input end of the amplifying module; The third input terminal of the amplification module is connected to the third terminal of the feedback module, and the output terminal of the amplification module is connected to the second terminal of the feedback module and is grounded; The first end of the switch module is connected to the first power supply, the control end of the switch module is connected to the third end of the current mirror module, the second end of the switch module is connected to the first end of the feedback module, and the second end of the switch module is used to output the output voltage; The third terminal of the feedback module is used to generate a feedback voltage, and the output voltage is controlled by the feedback voltage.

2. The voltage stabilizing circuit according to claim 1, characterized in that: The amplification module includes a positive temperature unit and a negative temperature unit; The first end of the positive temperature unit is the first input end of the amplifying module, the second end of the positive temperature unit is the second input end of the amplifying module, the third end of the positive temperature unit is the second end of the amplifying module, the positive temperature unit is grounded, and the fourth end of the positive temperature unit is connected to the first end of the negative temperature unit; The first end of the negative temperature unit is connected to the third end of the feedback module, and the second end of the negative temperature unit is grounded; The positive temperature unit is used to provide a positive temperature current to the feedback module to form a positive temperature voltage, the negative temperature unit is used to provide a negative temperature voltage to the feedback module, the output voltage is the sum of the positive temperature voltage and the negative temperature voltage, and the feedback module is used to adjust the positive temperature voltage and the negative temperature voltage to control the output voltage, so that the temperature coefficient of the output voltage is adjustable.

3. The voltage stabilizing circuit according to claim 2, characterized in that: The feedback module includes a first resistor and a second resistor; The first end of the first resistor is used to output an output voltage, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is grounded; The resistance values ​​of the first resistor and the second resistor are variable.

4. The voltage stabilizing circuit according to claim 2, characterized in that: The positive temperature unit includes a first switch tube, a third resistor and a second switch tube; The first end of the first switch tube is connected to the second end of the current mirror module, the second end of the first switch tube is grounded, and the third end of the first switch tube is connected to the third end of the second switch tube; The first end of the second switch tube is connected to the third end of the current mirror module, and the second end of the second switch tube is grounded through the first resistor.

5. The voltage stabilizing circuit according to claim 4, characterized in that: The negative temperature unit is a third switch tube; The first end of the third switch tube is connected to the third end of the second switch tube and the third end of the feedback module, the first end of the third switch tube is connected to the third end of the third switch tube, and the second end of the third switch tube is grounded.

6. The voltage stabilizing circuit according to claim 1, characterized in that: The voltage stabilizing circuit further includes a buffer; The first end of the buffer is connected to the fourth end of the current mirror module, and the second end of the buffer is connected to the control end of the switch module; The buffer is used to perform impedance matching between the first power source and the load.

7. The voltage stabilizing circuit according to claim 1, characterized in that: The current mirror module includes a fifth switch tube and a sixth switch tube; The first end of the fifth switch tube is connected to the first power supply, the second end of the fifth switch tube is connected to the first input end of the amplification module, and the third end of the fifth switch tube is connected to the third end of the sixth switch tube; The first end of the sixth switch tube is connected to the first power supply, and the second end of the sixth switch tube is connected to the second input end of the amplification module; The fifth switch tube and the sixth switch tube are used to ensure that the currents at the first input terminal and the second input terminal of the amplification module are equal.

8. The voltage stabilizing circuit according to claim 7, characterized in that: The current mirror module also includes a seventh switch tube and an eighth switch tube; The first end of the seventh switch tube is connected to the second end of the fifth switch tube, the second end of the seventh switch tube is connected to the first input end of the amplification module, and the third end of the seventh switch tube is connected to the third end of the eighth switch tube; The first end of the eighth switch tube is connected to the second end of the sixth switch tube, and the second end of the eighth switch tube is connected to the second input end of the amplification module.

9. The voltage stabilizing circuit according to claim 4, characterized in that: The positive temperature unit also includes a seventh switch tube and an eighth switch tube; The first end of the seventh switch tube is connected to the second end of the current mirror module, the second end of the seventh switch tube is connected to the first end of the first switch tube, and the third end of the seventh switch tube is connected to the third end of the eighth switch tube; The first end of the eighth switch tube is connected to the third end of the current mirror module, and the second end of the eighth switch tube is connected to the first end of the second switch tube.

10. An integrated circuit chip, characterized in that: The invention comprises a voltage stabilizing circuit as claimed in any one of claims 1 to 9.

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