Bandgap reference device and bandgap reference working equipment

Abstract

This application provides a bandgap reference device and a bandgap reference working apparatus, belonging to the field of power electronics technology. The device includes: a voltage generation module and a voltage adjustment module; the voltage generation module is connected to the voltage adjustment module, and the voltage generation module provides a first supply voltage and a second supply voltage to the voltage adjustment module; the voltage adjustment module includes: an amplifier circuit and a capacitor array circuit; the first supply voltage is connected to the input terminal of the amplifier circuit and the capacitor array circuit, and the second supply voltage is connected to the capacitor array circuit; the voltage adjustment module adjusts the first supply voltage through the amplifier circuit and the capacitor array circuit, and outputs a bandgap reference voltage. This application can output a bandgap reference voltage with high accuracy and stability.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more specifically, to a bandgap reference device and a bandgap reference working apparatus. Background Technology

[0002] In the field of power electronics, since some working devices need to operate based on a bandgap reference voltage, a bandgap reference circuit is usually used to generate the bandgap reference voltage.

[0003] In existing bandgap reference circuits, a voltage difference is typically generated based on the virtual short and virtual open principle of a transistor operational amplifier, and then the bandgap reference voltage is obtained based on the voltage difference.

[0004] However, during the operation of the op-amp and the generation of the voltage difference, mismatches in the circuit components can occur, which may lead to offset voltage in the circuit and result in low accuracy of the output bandgap reference voltage. Summary of the Invention

[0005] The purpose of this application is to provide a bandgap reference device and a bandgap reference working device, which can improve the accuracy and stability of the output bandgap reference voltage.

[0006] The embodiments of this application are implemented as follows:

[0007] One aspect of this application provides a bandgap reference device, including: a voltage generation module and a voltage adjustment module;

[0008] The voltage generation module is connected to the voltage adjustment module, and the voltage generation module is used to provide the voltage adjustment module with a first power supply voltage and a second power supply voltage.

[0009] The voltage adjustment module includes an amplifier circuit and a capacitor array circuit; a first power supply voltage is connected to the input terminal of the amplifier circuit and the capacitor array circuit, the amplifier circuit and the capacitor array circuit are connected, and a second power supply voltage is connected to the capacitor array circuit.

[0010] The voltage adjustment module is used to adjust the first supply voltage through an amplifier circuit and a capacitor array circuit, and output a bandgap reference voltage.

[0011] Optionally, the amplifier circuit includes: an amplifier and a switching device;

[0012] The first input terminal of the amplifier is connected to the first supply voltage and the error voltage. The output terminal of the amplifier is connected to the external load and the first terminal of the switching device. The second terminal of the switching device is connected to the capacitor array circuit and the second input terminal of the amplifier. The amplifier is used to output a bandgap reference voltage.

[0013] Optionally, the switching device is a clock-controlled switch, which is used to control the circuit to turn on and off according to a first clock signal.

[0014] Optionally, the capacitor array circuit includes: a capacitor array top-level board and multiple capacitor array units;

[0015] The top-level board of the capacitor array is connected to the amplifier circuit, and each capacitor array unit is connected to the top-level board of the capacitor array.

[0016] Optionally, the capacitor array unit includes: a plurality of first capacitor array units;

[0017] Each first capacitor array unit includes: a first capacitor and a first inverter;

[0018] The power supply terminal of the first inverter is connected to the second supply voltage, and the ground terminal of the first inverter is connected to a pre-configured fixed supply voltage.

[0019] The output of the first inverter is connected to the first terminal of the first capacitor; the second terminal of the first capacitor is connected to the top plate of the capacitor array.

[0020] Optionally, the control terminal of the first inverter is connected to the target control signal; each first inverter is used to control the output of the first inverter according to the target control signal.

[0021] Optionally, the capacitor array unit includes: a second capacitor array unit;

[0022] The second capacitor array unit includes: a second capacitor and a second inverter;

[0023] The power supply terminal of the second inverter is connected to the bandgap reference voltage, and the ground terminal of the second inverter is connected to the first supply voltage.

[0024] The output of the second inverter is connected to the first terminal of the second capacitor; the second terminal of the second capacitor is connected to the top plate of the capacitor array.

[0025] Optionally, the control terminal of the second inverter is connected to the first clock signal; the second inverter is used to control the output of the second inverter according to the first clock signal.

[0026] Optionally, the second supply voltage is generated by a second clock signal, which is 180 degrees out of phase with the first clock signal.

[0027] In another aspect of this application, a bandgap reference working device is provided, including: a bandgap reference device and an external load, wherein the bandgap reference device is connected to the external load and is used to provide a bandgap reference voltage to the external load.

[0028] The beneficial effects of the embodiments of this application include:

[0029] In the bandgap reference device and bandgap reference working apparatus provided in this application embodiment, a voltage generation module is connected to a voltage adjustment module. The voltage generation module can provide a first supply voltage and a second supply voltage to the voltage adjustment module. The voltage adjustment module may include an amplifier circuit and a capacitor array circuit. The first supply voltage is connected to the input terminal of the amplifier circuit and the capacitor array circuit, and the second supply voltage is connected to the capacitor array circuit. The voltage adjustment module can adjust the first supply voltage through the amplifier circuit and the capacitor array circuit, and output a bandgap reference voltage. During the adjustment of the first supply voltage through the amplifier circuit and the capacitor array circuit, voltage offset can be eliminated, thereby reducing the voltage offset in the circuit and improving the accuracy and stability of the output bandgap reference. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the bandgap reference device provided in the embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the amplification circuit in the bandgap reference device provided in the embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the capacitor array circuit in the bandgap reference device provided in the embodiments of this application;

[0034] Figure 4 This is another schematic diagram of the capacitor array circuit in the bandgap reference device provided in the embodiments of this application;

[0035] Figure 5 A phase diagram of the first clock signal and the second clock signal provided for embodiments of this application;

[0036] Figure 6 This is a schematic diagram of the overall structure of the bandgap reference device provided in the embodiments of this application;

[0037] Figure 7 This is a schematic diagram of the structure of the bandgap reference working device provided in the embodiments of this application.

[0038] Icons: 10 - Bandgap reference device; 20 - External load; 100 - Voltage generation module; 200 - Voltage adjustment module; 210 - Amplifier circuit; 220 - Capacitor array circuit; 221 - Capacitor array top plate; 222 - Capacitor array unit; U - Amplifier; S - Switching device; C1 - First capacitor; C2 - Second capacitor; V1 - First inverter; V2 - Second inverter. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this application, it should be noted that the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] The specific structure and working principle of the bandgap reference device provided in the embodiments of this application will be explained in detail below.

[0044] Figure 1 Please refer to the schematic diagram of the bandgap reference device provided in the embodiments of this application. Figure 1 The bandgap reference device includes a voltage generation module 100 and a voltage adjustment module 200.

[0045] The voltage generation module 100 is connected to the voltage adjustment module 200. The voltage generation module 100 provides a first supply voltage and a second supply voltage to the voltage adjustment module 200. The voltage adjustment module 200 includes an amplifier circuit 210 and a capacitor array circuit 220. The first supply voltage is connected to the input terminal of the amplifier circuit 210 and the capacitor array circuit 220. The amplifier circuit 210 is connected to the capacitor array circuit 220. The second supply voltage is connected to the capacitor array circuit 220. The voltage adjustment module adjusts the first supply voltage through the amplifier circuit 210 and the capacitor array circuit 220 and outputs a bandgap reference voltage.

[0046] Optionally, the voltage generation module 100 can be a positive and negative temperature coefficient voltage generation circuit, which can generate voltages that are not affected by external temperature, and can provide a first power supply voltage and a second power supply voltage to the voltage adjustment module 200 respectively.

[0047] The first supply voltage can be a fixed voltage value, and the second supply voltage can be a voltage value that changes periodically, including a high voltage and a low voltage, with the high and low voltages switching over time.

[0048] Optionally, in the voltage adjustment module 200, the amplifier circuit 210 can be a circuit that amplifies the input voltage through an amplifying element; the capacitor array circuit 220 can be a circuit composed of multiple capacitors, which can change the voltage by adjusting the connected capacitors, thereby adjusting the first supply voltage in cooperation with the amplifier circuit 210, and thus obtaining the bandgap reference voltage.

[0049] In a bandgap reference device provided in this application embodiment, a voltage generation module is connected to a voltage adjustment module. The voltage generation module can provide a first supply voltage and a second supply voltage to the voltage adjustment module. The voltage adjustment module may include an amplifier circuit and a capacitor array circuit. The first supply voltage is connected to the input terminal of the amplifier circuit and the capacitor array circuit, and the second supply voltage is connected to the capacitor array circuit. The voltage adjustment module can adjust the first supply voltage through the amplifier circuit and the capacitor array circuit, and output a bandgap reference voltage. During the adjustment of the first supply voltage through the amplifier circuit and the capacitor array circuit, voltage offset can be eliminated, thereby reducing the voltage offset in the circuit and improving the accuracy and stability of the output bandgap reference.

[0050] The following section will explain in detail the specific structure and connection relationship of the amplifier circuit in the bandgap reference device in the embodiments of this application.

[0051] Figure 2For a schematic diagram of the amplification circuit in the bandgap reference device provided in the embodiments of this application, please refer to... Figure 2 The amplifier circuit 210 includes: amplifier U and switching device S.

[0052] The amplifier U has a first input terminal connected to a first supply voltage and an error voltage. The output terminal of the amplifier U is connected to an external load and the first terminal of the switching device S. The second terminal of the switching device S is connected to the capacitor array circuit 220 and the second input terminal of the amplifier U. The amplifier U is used to output a bandgap reference voltage.

[0053] Optionally, amplifier U can be a dual-input single-output device, wherein the first input terminal can be a positive input terminal and the second input terminal can be a negative input terminal. The first input terminal can be input with the first power supply voltage, which is the first power supply voltage provided by the voltage generation module 100.

[0054] In addition, the first input terminal of amplifier U can also receive an error voltage, which is an additional input voltage used to eliminate the effects of offset voltage in the circuit.

[0055] The second input terminal of amplifier U can be connected to the output terminal of amplifier U via a switching device S. The connection relationship between amplifier circuit 210 and capacitor array circuit 220 can be switched by adjusting the on / off state of switching device S. The output terminal of amplifier U can output a bandgap reference voltage.

[0056] Specifically, when the switch S is open, the second input terminal of the amplifier U is connected to the entire capacitor array circuit 220, and the bandgap reference voltage output by the output terminal is not provided to the capacitor array circuit 220; when the switch S is closed, the second input terminal and the output terminal of the amplifier U are connected, both to the entire capacitor array circuit 220.

[0057] Optionally, the switching device S is a clock-controlled switch, which is used to control the circuit to turn on and off according to the first clock signal.

[0058] Optionally, the first clock signal can provide a high-level signal and a low-level signal during its operating cycle. When a high-level signal is provided, the switching device S is turned on; when a low-level signal is provided, the switching device S is turned off. It should be noted that the switching device S can be any type of clock-controlled switch, such as a switching transistor, etc., without any specific restrictions.

[0059] The following section will explain in detail the specific structure and connection relationship of the capacitor array circuit in the bandgap reference device provided in the embodiments of this application.

[0060] Figure 3For a schematic diagram of the capacitor array circuit in the bandgap reference device provided in this application embodiment, please refer to... Figure 3 The capacitor array circuit 220 includes: a capacitor array top plate 221 and multiple capacitor array units 222.

[0061] Among them, the top plate of the capacitor array 221 is connected to the amplifier circuit 210, and each capacitor array unit 222 is connected to the top plate of the capacitor array 221.

[0062] Optionally, the top-level board 221 of the capacitor array can be a circuit board for connecting the capacitor array units 222, and multiple capacitor array units 222 can be set on the top-level board 221 of the capacitor array.

[0063] Each capacitor array unit 222 may include a capacitor, which can be used to selectively connect the capacitor. One or more capacitors can be selected to be connected to the circuit according to the actual control.

[0064] The specific structure of each capacitor array unit in the capacitor array circuit provided in the embodiments of this application will be explained in detail below.

[0065] Figure 4 For another structural schematic diagram of the capacitor array circuit in the bandgap reference device provided in the embodiments of this application, please refer to... Figure 4 The capacitor array unit 222 includes: a plurality of first capacitor array units.

[0066] Each first capacitor array unit includes: a first capacitor C1 and a first inverter V1; the power supply terminal of the first inverter V1 is connected to a second power supply voltage, and the ground terminal of the first inverter V1 is connected to a pre-configured fixed power supply voltage; the output terminal of the first inverter V1 is connected to the first terminal of the first capacitor C1; the second terminal of the first capacitor C1 is connected to the top plate 221 of the capacitor array.

[0067] It should be noted that the capacitance value of the first capacitor C1 in different first capacitor array units may not be the same. For example, the capacitance value of the first capacitor C1 in the first first capacitor array unit is C, the capacitance value of the first capacitor C1 in the second first capacitor array unit is 2C, the capacitance value of the first capacitor C1 in the third first capacitor array unit is 4C, and the capacitance value of the first capacitor C1 in the Nth first capacitor array unit is 2C. N Class C, etc., are not restricted here.

[0068] For each first inverter V1 of the first capacitor array unit, the voltage connected to it may include the second supply voltage VR and the pre-configured fixed supply voltage VSS. The first inverter V1 can select the voltage connected to the capacitor according to the voltage level of the second supply voltage VR and the fixed supply voltage VSS.

[0069] Optionally, the control terminal of the first inverter V1 is connected to the target control signal; each first inverter V1 is used to control the output of the first inverter V1 according to the target control signal.

[0070] Optionally, the target control signal is... Figure 4 The B signal shown can be different for different first capacitor array units, and can be represented as B respectively. <0> B <1> B <n>.

[0071] It should be noted that the target control signal can be a high-low level signal, and for each first capacitor array unit, when the target control signal is a high level signal, the inverter is started, and the inverter reverses the input signal by 180 degrees; that is, when the target control signal is high, the voltage output by the first inverter V1 is low, and since the second supply voltage VR can vary, when VR is high, VR is greater than VSS, the output of the first inverter V1 is low, that is, the fixed supply voltage VSS; when VR is low, VR is less than VSS, the output of the first inverter V1 is low, that is, the second supply voltage VR.

[0072] Optionally, the capacitor array unit 222 can further include: a second capacitor array unit; the second capacitor array unit includes: a second capacitor C2, a second inverter V2; the power supply end of the second inverter V2 is connected to the bandgap reference voltage, and the ground end of the second inverter V2 is connected to the first supply voltage; the output end of the second inverter V2 is connected to the first end of the second capacitor C2; and the second end of the second capacitor C2 is connected to the capacitor array top plate 221.

[0073] Optionally, unlike the first capacitor array unit, the second capacitor array unit can be provided with one, wherein the capacitance value of the second capacitor C2 is not specifically limited, and the voltage to which the second inverter V2 in the second capacitor array unit is connected can include the first supply voltage V BE1 and the bandgap reference voltage V OUT output by the amplifier U. BE1 The second inverter V2 can select the voltage of the capacitor according to the voltage high-low of the first supply voltage V OUT and the bandgap reference voltage V BE1 .

[0074] Optionally, the control end of the second inverter V2 is connected to the first clock signal; and the second inverter V2 is used to control the output of the second inverter according to the first clock signal.

[0075] Optionally, the first clock signal CKB can be a signal that provides a high level and a low level according to a certain period, and for the second capacitor array unit, the first supply voltage V BE1 is less than the bandgap reference voltage V OUT , when the first clock signal CKB is high, the output of the second inverter V2 is low, that is, the first supply voltage V BE1 ; and when the first clock signal is low, the output of the second inverter V2 is high, that is, the bandgap reference voltage V OUT .

[0076] Figure 5 The phase diagram of the first clock signal and the second clock signal provided by the embodiment of the present application is shown in FIG. 1. Figure 5 The second supply voltage VR is generated by the second clock signal, and the phase of the second clock signal is 180 degrees different from that of the first clock signal CKB.

[0077] That is to say, when the second supply voltage is high, the first clock signal CKB is low; on the contrary, when the second supply voltage is low, the first clock signal CKB is high.

[0078] In addition, since the control terminals of the switch device S and the second inverter V2 are controlled by the first clock signal CKB, the switch device S and the second inverter V2 keep the consistency of the input signal in the controlled process.

[0079] The overall structure relationship and working principle of the bandgap reference device provided by the embodiment of the present application will be explained in detail below.

[0080] Figure 6 The overall structure diagram of the bandgap reference device provided by the embodiment of the present application is shown in FIG. 2. Figure 6 The first input terminal of the amplifier U is connected to the first supply voltage and the error voltage, the output terminal of the amplifier U is connected to the external load and the first terminal of the switch device S respectively, the second terminal of the switch device S is connected to the capacitor array circuit 220 and the second input terminal of the amplifier U respectively, and the amplifier U is used to output the bandgap reference voltage. Each first capacitor array unit includes a first capacitor C1 and a first inverter V1. The power supply terminal of the first inverter V1 is connected to the second supply voltage, the ground terminal of the first inverter V1 is connected to the pre-configured fixed supply voltage, the output terminal of the first inverter V1 is connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is connected to the capacitor array top plate 221. The second capacitor array unit includes a second capacitor C2 and a second inverter V2. The power supply terminal of the second inverter V2 is connected to the bandgap reference voltage, the ground terminal of the second inverter V2 is connected to the first supply voltage, the output terminal of the second inverter V2 is connected to the first terminal of the second capacitor C2, and the second terminal of the second capacitor C2 is connected to the capacitor array top plate 221.

[0081] Specifically, when the first clock signal CKB is high, the switch device S is turned on, and the whole voltage adjustment module 200 is in a closed loop form; when the first clock signal CKB is low, the switch device S is turned off, and the whole voltage adjustment module 200 is in an open loop form, and the voltage input to the second input terminal of the amplifier U is V SUM V SUM Specifically, the voltage of the capacitor array top plate 221. The voltage is equivalent to the average voltage of the charges on the capacitor array top plate 221 after being shared by all connected first capacitors C1 and second capacitors C2.

[0082] For example: if i different capacitors are turned on and charged, the charges on the upper and lower plates of the capacitors are C. i ·V i The charge generated by all selected capacitors is the sum of all charges, which is... Regarding the voltage across the capacitor array connected to the top-level board 221 of the capacitor array, the selection state of the inverter connected to the capacitors remains unchanged. However, the second supply voltage VR is a voltage signal that fluctuates continuously with the clock signal. When VR is high, the output voltage is VBE2', and when VR is low, the output voltage is VBE2. The voltage difference between the two is ΔV. BE In other words, the difference between the high and low voltages of the second supply voltage VR can be used to generate ΔV. BE Therefore, the average charge of all the first capacitors C1 in the capacitor array, when distributed across the capacitor connected to the output terminal, will correspond to the following first summation voltage:

[0083]

[0084] Among them, V sum1 This is the first summation voltage, ΔV. BE The voltage difference mentioned above refers to the number of first capacitors C1 that are turned on for charging, N refers to the total number of first capacitors C1, and C is the capacitance of the first first capacitor C1 (the capacitance of the Nth first capacitor is 2). N C), C2 is the capacitance value of the second capacitor C2, C i ·V i The sum of the charges on the top plate of the capacitor array when charging the i first capacitors that are turned on for charging.

[0085] Similarly, the second summed voltage generated by the charge distribution of the second capacitor C2 in the capacitor array to the top plate is:

[0086]

[0087] Among them, V sum2 This is the second summation voltage, V. OUT This is the bandgap reference voltage, V BE1 This is the first supply voltage.

[0088] The sum of the first and second summed voltages can be used as the voltage of the top plate 221 of the capacitor array, which is the aforementioned V. SUM .

[0089] It should be noted that the pressure difference ΔV BE First power supply voltage V BE1 Both can be temperature coefficient voltages, where the first supply voltage V BE1 For voltages with a positive temperature coefficient, the voltage difference ΔV BE The negative temperature coefficient voltage can be obtained by superimposing the two voltage coefficients after adjustment. Thus, the temperature influence on the voltage value in the circuit can be eliminated, i.e. a voltage not changing with temperature can be outputted.

[0090] When the switch device S is turned on, the bandgap reference voltage outputted by the amplifier U can be specifically represented as:

[0091]

[0092] wherein V os is the error voltage, A V is the amplification coefficient of the amplifier U.

[0093] When the switch device S is turned off, the bandgap reference voltage outputted by the amplifier U can be specifically represented as:

[0094] V OUT = (V BE1 + V os - V sum )A V ;

[0095] wherein V sum is the sum of the aforementioned V sum1 and V sum2 , which can be specifically the output voltage when the switch device S is turned on, and can be represented as:

[0096]

[0097] V sum is brought into the calculation formula of the aforementioned V OUT , and the following can be obtained:

[0098]

[0099] wherein Bi in the formula refers to the input of the i-th first inverter, which can be specifically a temperature coefficient adjustment code, i.e. B Figure 5 shown in the formula. .

[0100] wherein, V OUT The output error voltage is reduced from the original V os to:

[0101]

[0102] It can be obtained that the error of the circuit is reduced to very small at the output port, that is, after the first supply voltage is processed by the above-mentioned circuit, the influence of the amplifier's misadjustment on the bandgap reference voltage can be effectively reduced, that is, a more accurate bandgap reference voltage can be output.

[0103] The specific structure of the bandgap reference working device provided in the embodiments of the present application and the connection relationship thereof will be explained in detail below.

[0104] Figure 7 For the structure diagram of the bandgap reference working device provided in the embodiments of the present application, please refer to Figure 7 , the bandgap reference working device comprises a bandgap reference device 10 and an external load 20, the bandgap reference device 10 is connected with the external load 20, and the bandgap reference device 10 is used to provide a bandgap reference voltage for the external load 20.

[0105] The external load 20 can be any type of electrical equipment, and specifically can be a device that works using the bandgap reference voltage. The external load 20 can obtain the bandgap reference voltage output by the bandgap reference device 10 through the bandgap reference device 10, and then can work based on the bandgap reference voltage.

[0106] In the bandgap reference working device provided in the embodiments of the present application, the bandgap reference device is connected with the external load, wherein the bandgap reference device is used to provide a bandgap reference voltage for the external load, and in the bandgap reference device, a voltage generating module is connected with a voltage adjusting module, the voltage generating module can provide a first supply voltage and a second supply voltage for the voltage adjusting module, and the voltage adjusting module can comprise an amplification circuit and a capacitor array circuit, the first supply voltage is connected to the input end of the amplification circuit and the capacitor array circuit, the amplification circuit is connected with the capacitor array circuit, and the second supply voltage is connected to the capacitor array circuit. The voltage adjusting module can adjust the first supply voltage through the amplification circuit and the capacitor array circuit, and output the bandgap reference voltage. In the process of adjusting the first supply voltage through the amplification circuit and the capacitor array circuit, the misadjusted voltage can be eliminated, so as to reduce the misadjusted voltage in the circuit, improve the accuracy and stability of the output bandgap reference, and further improve the accuracy and stability of the external load working.

[0107] The above merely is a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0108] The above merely is a preferred embodiment of the present application, and is not used to limit the present application, and for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be covered within the protection scope of the present application. < / n>

Claims

1. A bandgap reference device, characterized by include: Voltage generation module and voltage adjustment module; The voltage generating module is connected to the voltage adjusting module, and the voltage generating module is used to provide the voltage adjusting module with a first power supply voltage and a second power supply voltage. The voltage adjustment module includes an amplifier circuit and a capacitor array circuit; the first power supply voltage is connected to the input terminal of the amplifier circuit and the capacitor array circuit, the amplifier circuit is connected to the capacitor array circuit, and the second power supply voltage is connected to the capacitor array circuit. The voltage adjustment module is used to adjust the first supply voltage through the amplification circuit and the capacitor array circuit, and output a bandgap reference voltage; The capacitor array circuit includes: a capacitor array top-level board and multiple capacitor array units; The top-level board of the capacitor array is connected to the amplifier circuit, and each capacitor array unit is connected to the top-level board of the capacitor array. The capacitor array unit includes: a plurality of first capacitor array units; Each of the first capacitor array units includes: a first capacitor and a first inverter; The power supply terminal of the first inverter is connected to the second supply voltage, and the ground terminal of the first inverter is connected to a pre-configured fixed supply voltage; The output terminal of the first inverter is connected to the first terminal of the first capacitor; the second terminal of the first capacitor is connected to the top plate of the capacitor array.

2. The bandgap reference device of claim 1, wherein, The amplification circuit includes: an amplifier and a switching device; The first input terminal of the amplifier is connected to a first power supply voltage. The output terminal of the amplifier is connected to an external load and the first terminal of the switching device. The second terminal of the switching device is connected to the capacitor array circuit and the second input terminal of the amplifier. The amplifier is used to output the bandgap reference voltage and generates an error voltage.

3. The bandgap reference device as described in claim 2, characterized in that, The switching device is a clock-controlled switch, which is used to control the circuit to turn on and off according to a first clock signal.

4. The bandgap reference device as described in claim 1, characterized in that, The control terminal of the first inverter is connected to the target control signal; each of the first inverters is used to control the output of the first inverter according to the target control signal.

5. The bandgap reference device as described in claim 1, characterized in that, The capacitor array unit includes: a second capacitor array unit; The second capacitor array unit includes: a second capacitor and a second inverter; The power supply terminal of the second inverter is connected to the bandgap reference voltage, and the ground terminal of the second inverter is connected to the first power supply voltage; The output terminal of the second inverter is connected to the first terminal of the second capacitor; the second terminal of the second capacitor is connected to the top plate of the capacitor array.

6. The bandgap reference device as described in claim 5, characterized in that, The control terminal of the second inverter is connected to the first clock signal; the second inverter is used to control the output of the second inverter according to the first clock signal.

7. A bandgap reference device as claimed in claim 3 or 6, wherein the first and second bandgap reference devices are connected in series. The second power supply voltage is generated by a second clock signal, which is 180 degrees out of phase with the first clock signal.

8. A bandgap reference operating device, characterized by include: The bandgap reference device and external load as described in any one of claims 1-7, wherein the bandgap reference device is connected to the external load, and the bandgap reference device is used to provide a bandgap reference voltage to the external load.

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