Voltage reference source circuit and reference chip

Abstract

The utility model provides a voltage reference source circuit and a reference chip. The circuit comprises a starting bias module, a reference module, a voltage stabilization module, a voltage regulation module and a voltage protection module. The input end of the starting bias module is connected with power voltage, the first output end is connected with the first power supply end of the reference module and one end of the voltage stabilization module, the second output end is connected with the power supply ends of the voltage regulation module and the voltage protection module, and the other end of the voltage stabilization module is grounded. The second power supply end of the reference module is connected with the output end of the voltage protection module, the output end is connected with the in-phase input end of the voltage regulation module, and the grounding end is grounded; the inverted input end of the voltage regulation module is connected with the voltage regulation port, the output end is connected with the input end of the voltage protection module, and the grounding end is grounded; the reference module balances temperature drift and outputs balanced voltage; the voltage regulation module regulates the balanced voltage; and the voltage protection module performs overcurrent protection and outputs stable reference voltage, so that the precision of the reference voltage is improved.

Description

Technical Field

[0001] This application relates to the semiconductor field, and more specifically, to a voltage reference source circuit and a reference chip. Background Technology

[0002] In electronic systems, pulse width modulation circuits, digital-to-analog converters, and other circuits require voltage reference sources that are independent of time, temperature, and process variations, ensuring that the reference voltage is unaffected by changes in time, temperature, and process.

[0003] The problem that needs to be solved is how to design a voltage reference source circuit that is simple in structure and can output a stable reference voltage. Utility Model Content

[0004] The purpose of this application is to address the shortcomings of the prior art by providing a voltage reference source circuit and a reference chip, thereby solving the practical problems of complex structure and poor voltage stability in the prior art voltage reference source circuit.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In a first aspect, embodiments of this application provide a voltage reference source circuit, the circuit comprising: a startup bias module, a reference module, a voltage regulator module, a voltage adjustment module, and a voltage protection module;

[0007] The input terminal of the startup bias module is connected to the power supply voltage. The first output terminal of the startup bias module is connected to the first power supply terminal of the reference module and one end of the voltage regulator module. The second output terminal of the startup bias module is connected to the power supply terminal of the voltage regulation module and the power supply terminal of the voltage protection module. The other end of the voltage regulator module is grounded.

[0008] The second power supply terminal of the reference module is connected to the output terminal of the voltage protection module, the output terminal of the reference module is connected to the non-inverting input terminal of the voltage regulation module, and the ground terminal of the reference module is grounded.

[0009] The inverting input terminal of the voltage regulation module is connected to the voltage adjustment port of the voltage reference source circuit, the output terminal of the voltage regulation module is connected to the input terminal of the voltage protection module, and the ground terminal of the voltage regulation module is grounded.

[0010] The startup bias module is used to provide a startup voltage to the reference module when the voltage protection module does not output a stable reference voltage, and to supply power to the voltage regulation module and the voltage protection module.

[0011] The reference module is used to balance temperature drift and output a balanced voltage when powered by the start-up voltage or the reference voltage.

[0012] The voltage regulation module is used to regulate the balanced voltage;

[0013] The voltage protection module is used for overcurrent protection and outputs a stable reference voltage.

[0014] As an optional implementation, the reference module includes: a startup unit, a current maintenance unit, and a temperature drift balancing unit;

[0015] The first output terminal of the current sustaining unit is connected to the first terminal of the temperature drift balancing unit, the second output terminal of the current sustaining unit is connected to the second terminal of the temperature drift balancing unit and the first terminal of the starting unit, and the power supply terminal of the current sustaining unit is connected to the third terminal of the starting unit and the output terminal of the voltage protection module.

[0016] The second end of the starting unit is connected to the first output end of the starting bias module and the third end of the temperature drift balancing unit;

[0017] The fourth terminal of the temperature drift balancing unit is connected to the non-inverting input terminal of the voltage regulation module, and the fifth terminal of the temperature drift balancing unit is grounded.

[0018] As an optional implementation, the current sustaining unit includes: a first resistor, a second resistor, a first PNP transistor, and a second PNP transistor;

[0019] One end of the first resistor is connected to one end of the second resistor, the output terminal of the voltage protection module, and the third terminal of the startup unit; the other end of the first resistor is connected to the emitter of the first PNP transistor.

[0020] The other end of the second resistor is connected to the emitter of the second PNP transistor;

[0021] The base of the first PNP transistor is short-circuited to the collector of the first PNP transistor, and the base of the first PNP transistor is connected to the base of the second PNP transistor. The collector of the first PNP transistor is connected to the first end of the temperature drift balancing unit.

[0022] The collector of the second PNP transistor is connected to the second terminal of the temperature drift balancing unit and the first terminal of the startup unit.

[0023] As an optional implementation, the startup unit includes a first NPN transistor;

[0024] The emitter of the first NPN transistor is connected to the first output terminal of the startup bias module and the third terminal of the temperature drift balancing unit;

[0025] The base of the first NPN transistor is connected to the second output terminal of the current sustaining unit and the second terminal of the temperature drift balancing unit;

[0026] The collector of the first NPN transistor is connected to the power supply terminal of the current sustaining unit and the output terminal of the voltage protection module.

[0027] As an optional implementation, the temperature drift balancing unit includes: a second NPN transistor, a third NPN transistor, a fourth NPN transistor, a first Zener diode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a noise reduction port;

[0028] The collector of the second NPN transistor is connected to the first output terminal of the current sustaining unit, the base of the second NPN transistor is connected to the base of the third NPN transistor, the second terminal of the startup unit, the first output terminal of the startup bias module, and one end of the first Zener diode, the emitter of the second NPN transistor is connected to one end of the third resistor, and the other end of the third resistor is grounded.

[0029] The collector of the third NPN transistor is connected to the second output terminal of the current sustaining unit, the emitter of the third NPN transistor is connected to the collector of the fourth NPN transistor and one end of the noise reduction port, and the other end of the noise reduction port is connected to the non-inverting input terminal of the voltage regulation module.

[0030] The base of the fourth NPN transistor is connected to one end of the fifth resistor and one end of the sixth resistor, and the emitter of the fourth NPN transistor and the other end of the sixth resistor are grounded.

[0031] The other end of the fifth resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the other end of the first Zener diode.

[0032] As an optional implementation, the voltage regulation module includes: a voltage regulation unit and a reference voltage divider unit;

[0033] The power supply terminal of the voltage regulation unit is connected to the second output terminal of the start-up bias module, the non-inverting input terminal of the voltage regulation unit is connected to the output terminal of the reference module, the inverting input terminal of the voltage regulation unit is connected to the first terminal of the reference voltage divider unit, and the output terminal of the voltage regulation unit is connected to the second terminal of the reference voltage divider unit and the input terminal of the voltage protection module.

[0034] The third terminal of the reference voltage divider unit is connected to the voltage adjustment port, and the fourth terminal of the reference voltage divider unit is grounded.

[0035] As an optional implementation, the voltage regulation unit includes an operational amplifier;

[0036] The power supply terminal of the operational amplifier is connected to the second output terminal of the startup bias module;

[0037] The non-inverting input of the operational amplifier is connected to the output of the reference module;

[0038] The inverting input terminal of the operational amplifier is connected to the first terminal of the reference voltage divider unit;

[0039] The output terminal of the operational amplifier is connected to the second terminal of the reference voltage divider unit and the input terminal of the voltage protection module.

[0040] As an optional implementation, the reference voltage divider unit includes: a seventh resistor, an eighth resistor, and a ninth resistor;

[0041] One end of the seventh resistor is connected to the output terminal of the voltage regulation unit and the input terminal of the voltage protection module, and the other end of the seventh resistor is connected to the inverting input terminal of the voltage regulation unit, one end of the eighth resistor, and one end of the ninth resistor.

[0042] The other end of the ninth resistor is connected to the voltage adjustment port, and the other end of the eighth resistor is grounded.

[0043] As an optional implementation, the circuit also includes a first capacitor;

[0044] One end of the first capacitor is connected to the output terminal of the voltage regulation module and the input terminal of the voltage protection module;

[0045] The other end of the first capacitor is connected to the output terminal of the voltage protection module.

[0046] Secondly, embodiments of this application provide a reference chip, which includes the voltage reference source circuit described in the first aspect above.

[0047] The beneficial effects of this application are:

[0048] This application provides a voltage reference source circuit and a reference chip. The voltage reference source circuit includes a startup bias module, a reference module, a voltage regulator module, a voltage adjustment module, and a voltage protection module. The input terminal of the startup bias module is connected to a power supply voltage. Its first output terminal is connected to the first power supply terminal of the reference module and one end of the voltage regulator module, with the other end of the voltage regulator module grounded. The startup bias module provides a startup voltage to the reference module when the voltage protection module does not output a stable reference voltage. The second output terminal of the startup bias module is connected to the power supply terminals of the voltage adjustment module and the voltage protection module to supply power to both. The second power supply terminal of the reference module is connected to the output terminal of the voltage protection module, and the ground terminal of the reference module is grounded. A stable reference voltage is connected to the second power supply terminal of the reference module, supplying power to the reference module. The output terminal of the reference module is connected to the non-inverting input terminal of the voltage adjustment module to balance temperature drift when powered by the startup voltage or the reference voltage, and to output a balanced voltage to the voltage adjustment module. The inverting input terminal of the voltage adjustment module is connected to the voltage adjustment port of the voltage reference source circuit, and the voltage adjustment port can be externally connected to a resistor to adjust the amplitude of the reference voltage. The output of the voltage regulation module is connected to the input of the voltage protection module to output a regulated voltage. The grounding terminal of the voltage regulation module is grounded. The voltage regulation module adjusts the balanced voltage received at the non-inverting input to obtain a regulated voltage, which is then output to the voltage protection module for overcurrent protection and to provide a stable reference voltage. The reference module performs temperature drift balancing, outputting a temperature-independent balanced voltage to the voltage regulation module. Through voltage regulation and protection, a temperature-independent reference voltage is obtained. This simplifies the reference circuit structure and improves the stability and reliability of the reference voltage. Attached Figure Description

[0049] 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.

[0050] Figure 1 This is a schematic diagram of the voltage reference source circuit provided in the embodiments of this application;

[0051] Figure 2 This is another schematic diagram of the voltage reference source circuit provided in the embodiments of this application;

[0052] Figure 3 Another schematic diagram of the voltage reference source circuit provided in the embodiments of this application;

[0053] Figure 4 This is another schematic diagram of the voltage reference source circuit provided in the embodiments of this application.

[0054] Icons: Start-up bias module: 1; Reference module: 2; Voltage regulator module: 3; Voltage regulation module: 4; Voltage protection module: 5; Voltage adjustment port: TRIM; Start-up unit: 21; Current maintenance unit: 22; Temperature drift balancing unit: 23; Voltage regulation unit: 41; Reference voltage divider unit: 42; First resistor: R1; Second resistor: R2; Third resistor: R3; Fourth resistor: R4; Fifth resistor: R5; Sixth resistor: R6; Seventh resistor: R7; Eighth resistor: R8; Ninth resistor: R9; Operational amplifier: A1; First PNP transistor: P1; Second PNP transistor: P2; First NPN transistor: N1; Second NPN transistor: N2; Third NPN transistor: N3; Fourth NPN transistor: N4; Noise reduction port: NOISEREDUCTION; First Zener diode: Z1; Second Zener diode: Z2; First capacitor: C1. Detailed Implementation

[0055] 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.

[0056] 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.

[0057] It should be noted that similar reference numerals 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. In the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0058] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0059] In electronic systems, pulse width modulation circuits, analog-to-digital converters, and other similar circuits require voltage reference sources that are independent of time, temperature, and process variations. In other words, the reference voltage must be unaffected by changes in time, temperature, and process technology. Therefore, designing a voltage reference source circuit that is simple in structure yet can output a stable reference voltage is a problem that needs to be solved.

[0060] This application proposes a voltage reference source circuit to address the aforementioned problems. The circuit includes a startup bias module, a reference module, a voltage regulator module, a voltage adjustment module, and a voltage protection module. A current sustaining unit in the reference module provides a stable current to the reference module, and a temperature drift balancing unit in the reference module balances temperature drift to output a balanced voltage unaffected by temperature. The voltage adjustment module regulates the balanced voltage, and the voltage protection module provides overcurrent protection to output a stable reference voltage. The temperature drift balancing unit utilizes the positive temperature coefficient of multiple resistors and a Zener diode, along with the negative temperature coefficients of multiple NPN transistors, to cancel each other out, thus balancing temperature drift. This reduces the complexity of the reference circuit design and improves the stability and reliability of the reference voltage.

[0061] Figure 1 This is a schematic diagram of the voltage reference source circuit provided in the embodiments of this application, as shown below. Figure 1 As shown, the voltage reference source circuit includes: a startup bias module 1, a reference module 2, a voltage regulator module 3, a voltage adjustment module 4, and a voltage protection module 5.

[0062] Optionally, refer to Figure 1 The voltage reference source circuit includes five modules: a startup bias module 1, a reference module 2, a voltage regulator module 3, a voltage adjustment module 4, and a voltage protection module 5. The startup bias module 1 is connected to the reference module 2, the voltage regulator module 3, the voltage adjustment module 4, and the voltage protection module 5.

[0063] The input terminal of the start bias module 1 is connected to the power supply voltage. The first output terminal of the start bias module 1 is connected to the first power supply terminal of the reference module 2 and one end of the voltage regulator module 3. The second output terminal of the start bias module 1 is connected to the power supply terminal of the voltage regulation module 4 and the power supply terminal of the voltage protection module 5. The other end of the voltage regulator module 3 is grounded.

[0064] Optionally, continue to refer to Figure 1 The startup bias module 1 includes one input terminal and two output terminals. The input terminal of startup bias module 1 is connected to the power supply voltage VIN to obtain the electrical energy provided by VIN. The first output terminal of startup bias module 1 is connected to the first power supply terminal of reference module 2 and one end of voltage regulator module 3, respectively. The second output terminal of startup bias module 1 is connected to the power supply terminals of voltage regulation module 4 and voltage protection module 5, respectively. The other end of voltage regulator module 3 is grounded. Specifically, startup bias module 1 provides startup voltage to reference module 2 through its first output terminal and supplies power to voltage regulation module 4 and voltage protection module 5 through its second output terminal. Voltage regulator module 3 is used to stabilize the voltage across startup bias module 1.

[0065] The second power supply terminal of the reference module 2 is connected to the output terminal of the voltage protection module 5, the output terminal of the reference module 2 is connected to the non-inverting input terminal of the voltage regulation module 4, and the ground terminal of the reference module 2 is grounded.

[0066] Optionally, continue to refer to Figure 1 The reference module 2 includes two power supply terminals, one output terminal, and one ground terminal. The second power supply terminal of the reference module 2 is connected to the output terminal of the voltage protection module 5, whereby the output terminal of the voltage protection module 5 outputs a stable reference voltage VOUT. In other words, the second power supply terminal of the reference module 2 is connected to a stable reference voltage VOUT. The output terminal of the reference module 2 is connected to the non-inverting input terminal of the voltage regulation module 4 to output a balanced voltage to the voltage regulation module 4. The ground terminal of the reference module 2 is grounded.

[0067] The inverting input terminal of voltage regulation module 4 is connected to the voltage adjustment port TRIM of the voltage reference source circuit, the output terminal of voltage regulation module 4 is connected to the input terminal of voltage protection module 5, and the ground terminal of voltage regulation module 4 is grounded.

[0068] Optionally, continue to refer to Figure 1 The voltage regulation module 4 includes a non-inverting input terminal, an inverting input terminal, an output terminal, and a ground terminal. The inverting input terminal of the voltage regulation module 4 is connected to the voltage adjustment port TRIM of the voltage reference source circuit. The voltage adjustment port TRIM can be connected to an external resistor to adjust the amplitude of the reference voltage VOUT. The output terminal of the voltage regulation module 4 is connected to the input terminal of the voltage protection module 5 to output the regulated voltage to the voltage protection module 5. The ground terminal of the voltage regulation module 4 is grounded.

[0069] The startup bias module 1 is used to provide a startup voltage to the reference module 2 when the voltage protection module 5 does not output a stable reference voltage, and to supply power to the voltage regulation module 4 and the voltage protection module 5.

[0070] Optionally, continue to refer to Figure 1When the voltage protection module 5 fails to output a stable reference voltage, the start-up bias module 1 provides a start-up voltage to the reference module 2 through its first output terminal. Once the voltage protection module 5 can output a stable reference voltage, the start-up voltage supply to the reference module 2 automatically stops. Furthermore, the start-up bias module 1 continuously supplies power to the voltage regulation module 4 and the voltage protection module 5 through its second output terminal to ensure their normal operation.

[0071] Reference module 2 is used to balance temperature drift and output a balanced voltage when powered by the startup voltage or reference voltage.

[0072] Optionally, when the reference module 2 is powered by the startup voltage provided by the startup bias module 1, it balances the temperature drift to obtain a balanced voltage that is unaffected by temperature after balancing the temperature drift, and outputs it to the non-inverting input terminal of the voltage regulation module 4. Alternatively, when the reference module 2 is powered by the stable reference voltage VOUT output by the voltage protection module 5, it balances the temperature drift to obtain a balanced voltage that is unaffected by temperature drift, and outputs it to the non-inverting input terminal of the voltage regulation module 4.

[0073] Voltage regulation module 4 is used to regulate the balanced voltage. Voltage protection module 5 is used for overcurrent protection and outputs a stable reference voltage.

[0074] Optionally, the voltage regulation module 4 amplifies, follows, or reduces the balanced voltage received at the non-inverting input terminal according to the actual voltage requirement of the reference voltage source, obtains the regulated voltage, and outputs it to the voltage protection module 5 so that the voltage protection module 5 can perform overcurrent protection to prevent the reference chip of the voltage reference source circuit from burning out due to excessive current, and output a stable reference voltage VOUT.

[0075] In this embodiment, the voltage reference source circuit includes a startup bias module, a reference module, a voltage regulator module, a voltage adjustment module, and a voltage protection module. The input terminal of the startup bias module is connected to the power supply voltage. Its first output terminal is connected to the first power supply terminal of the reference module and one end of the voltage regulator module, with the other end of the voltage regulator module grounded. The startup bias module provides a startup voltage to the reference module when the voltage protection module does not output a stable reference voltage. The second output terminal of the startup bias module is connected to the power supply terminals of the voltage adjustment module and the voltage protection module to supply power to both. The second power supply terminal of the reference module is connected to the output terminal of the voltage protection module, and the ground terminal of the reference module is grounded. A stable reference voltage is connected to the second power supply terminal of the reference module, supplying power to the reference module. The output terminal of the reference module is connected to the non-inverting input terminal of the voltage adjustment module to balance temperature drift when powered by the startup voltage or the reference voltage, and to output a balanced voltage to the voltage adjustment module. The inverting input terminal of the voltage adjustment module is connected to the voltage adjustment port of the voltage reference source circuit, where an external resistor can be connected to adjust the amplitude of the reference voltage. The output of the voltage regulation module is connected to the input of the voltage protection module to output a regulated voltage. The grounding terminal of the voltage regulation module is grounded. The voltage regulation module adjusts the balanced voltage received at the non-inverting input to obtain a regulated voltage, which is then output to the voltage protection module for overcurrent protection and to provide a stable reference voltage. The reference module performs temperature drift balancing, outputting a temperature-independent balanced voltage to the voltage regulation module. Through voltage regulation and protection, a temperature-independent reference voltage is obtained. This simplifies the reference circuit structure and improves the stability and reliability of the reference voltage.

[0076] Figure 2 Another schematic diagram of the voltage reference source circuit provided in the embodiments of this application is shown below. Figure 2 As shown, the reference module 2 includes: a startup unit 21, a current maintenance unit 22, and a temperature drift balancing unit 23.

[0077] Optionally, refer to Figure 2 The reference module 2 includes three units: a startup unit 21, a current sustaining unit 22, and a temperature drift balancing unit 23. The startup unit 21 is activated when the startup bias module 1 provides a startup voltage to the reference module 2, enabling the reference module 2 to quickly boost its voltage. This, in conjunction with the current sustaining unit 22 and the temperature drift balancing unit 23, allows for a rapid output of a stable balanced voltage. Specifically, the current sustaining unit 22 provides a stable current to the temperature drift balancing unit 23 in the reference module 2; the current output by the current sustaining unit 22 is always independent of the power supply voltage VIN and is unaffected by it. The temperature drift balancing unit 23 compensates for the temperature coefficient and balances temperature drift, resulting in a stable balanced voltage unaffected by temperature.

[0078] The first output terminal of the current sustaining unit 22 is connected to the first terminal of the temperature drift balancing unit 23, the second output terminal of the current sustaining unit 22 is connected to the second terminal of the temperature drift balancing unit 23 and the first terminal of the starting unit 21, and the power supply terminal of the current sustaining unit 22 is connected to the third terminal of the starting unit 21 and the output terminal of the voltage protection module 5.

[0079] Optionally, continue to refer to Figure 2 The current sustaining unit 22 includes two output terminals and one power supply terminal. The power supply terminal of the current sustaining unit 22 and the third terminal of the starting unit 21 both serve as the second power supply terminal of the reference module 2, connected to the output terminal of the voltage protection module 5, so that the current sustaining unit 22 can obtain electrical energy from a stable reference voltage VOUT. The first output terminal of the current sustaining unit 22 is connected to the first terminal of the temperature drift balancing unit 23, and the second output terminal of the current sustaining unit 22 is connected to both the first terminal of the temperature drift balancing unit 23 and the first terminal of the starting unit 21, to provide a stable current to the temperature drift balancing unit 23.

[0080] The second end of the starting unit 21 is connected to the first output end of the starting bias module 1 and the third end of the temperature drift balancing unit 23.

[0081] Optionally, continue to refer to Figure 2 The second terminal of the startup unit 21 and the third terminal of the temperature drift balancing unit 23 both serve as the first power supply terminals of the reference module 2, and are connected to the first output terminal of the startup bias module 1, so that the startup bias module 1 supplies power to the reference module 2 during the startup phase of the reference module 2. The startup unit 21 operates only during the startup phase of the reference module 2, that is, the startup unit 21 only operates when the startup bias module 1 supplies power to the reference module 2, and the startup unit 21 shuts down when a stable reference voltage VOUT supplies power to the reference module 2.

[0082] The fourth terminal of the temperature drift balancing unit 23 is connected to the non-inverting input terminal of the voltage regulation module 4, and the fifth terminal of the temperature drift balancing unit 23 is grounded.

[0083] Optionally, continue to refer to Figure 2 The fourth terminal of the temperature drift balancing unit 23 serves as the output terminal of the reference module 2 and is connected to the non-inverting input terminal of the voltage regulation module 4. The fifth terminal of the temperature drift balancing unit 23 serves as the ground terminal of the reference module 2 and is grounded. The temperature drift balancing unit 23 balances temperature drift by canceling the temperature coefficient, thereby outputting a stable balanced voltage to the voltage regulation module 4 that is unaffected by temperature.

[0084] In this embodiment, a startup unit, a current sustaining unit, and a temperature drift balancing unit are provided in the reference module. The power supply terminal of the current sustaining unit and the third terminal of the startup unit both serve as the second power supply terminals of the reference module, connected to the output terminal of the voltage protection module, so that the current sustaining unit can obtain power from a stable reference voltage. The first output terminal of the current sustaining unit is connected to the first terminal of the temperature drift balancing unit, and the second output terminal of the current sustaining unit is connected to both the first terminal of the temperature drift balancing unit and the first terminal of the startup unit, providing a stable current to the temperature drift balancing unit. The startup unit starts when the startup bias module provides a startup voltage to the reference module, enabling the reference module to quickly boost its voltage, and then, with the cooperation of the current sustaining unit and the temperature drift balancing unit, quickly output a stable balanced voltage. The startup unit shuts down when a stable reference voltage supplies power to the reference module. The current sustaining unit provides a stable current to the temperature drift balancing unit in the reference module, ensuring that the current output by the current sustaining unit is unaffected by the power supply voltage. The temperature drift balancing unit compensates for the temperature coefficient and balances temperature drift, outputting a stable balanced voltage unaffected by temperature. The accuracy and efficiency of the reference module's output balanced voltage are improved by using the startup unit, current sustaining unit, and temperature drift balancing unit in the reference module.

[0085] It is worth noting that, continuing to refer to Figure 2 The voltage regulator module 3 includes a second Zener diode Z2, which is used to stabilize the voltage across the startup bias module 1 to provide voltage support. For example, the second Zener diode Z2 can be a 6.1V Zener diode.

[0086] Figure 3 This is another schematic diagram of the voltage reference source circuit provided in the embodiments of this application, as shown below. Figure 3 As shown, the current sustaining unit 22 includes: a first resistor R1, a second resistor R2, a first PNP transistor P1, and a second PNP transistor P2.

[0087] Optionally, refer to Figure 3 The current sustaining unit 22 includes two resistors and two PNP transistors, namely a first resistor R1, a second resistor R2, a first PNP transistor P1, and a second PNP transistor P2. The first resistor R1, the second resistor R2, the first PNP transistor P1, and the second PNP transistor P2 constitute a proportional current mirror, which enables proportional control of the current, providing a stable current with a specific ratio independent of the power supply voltage VIN to the temperature drift balancing unit 23.

[0088] One end of the first resistor R1 is connected to one end of the second resistor R2, the output terminal of the voltage protection module 5, and the third terminal of the startup unit 21. The other end of the first resistor R1 is connected to the emitter of the first PNP transistor P1. The other end of the second resistor R2 is connected to the emitter of the second PNP transistor P2.

[0089] Optionally, continue to refer to Figure 3 One end of the first resistor R1 is connected to one end of the second resistor R2, and serves as the power supply terminal of the current sustaining unit 22. It is connected to the output terminal of the voltage protection module 5 and the third terminal of the start-up unit 21, respectively, to obtain the electrical energy provided by the stable reference voltage VOUT output by the voltage protection module 5. The other end of the first resistor R1 is connected to the emitter of the first PNP transistor P1, and the other end of the second resistor R2 is connected to the emitter of the second PNP transistor P2.

[0090] The base of the first PNP transistor P1 is short-circuited to the collector of the second PNP transistor P2, and the base of the first PNP transistor P1 is connected to the base of the second PNP transistor P2. The collector of the first PNP transistor P1 is connected to the first terminal of the temperature drift balancing unit 23. The collector of the second PNP transistor P2 is connected to the second terminal of the temperature drift balancing unit 23 and the first terminal of the start-up unit 21.

[0091] Optionally, continue to refer to Figure 3 The base of the first PNP transistor P1 is connected to the base of the second PNP transistor P2. The first PNP transistor P1 and the second PNP transistor P2 form a common base current mirror by sharing a base. The base and collector of the first PNP transistor P1 are shorted. After shorting the base and collector of the first PNP transistor P1, its collector current will have a specific proportional relationship with its emitter current, thus achieving the current mirror function. The collector of the first PNP transistor P1 also serves as the first output terminal of the current sustaining unit 22, connected to the first terminal of the temperature drift balancing unit 23. The collector of the second PNP transistor P2 serves as the second output terminal of the current sustaining unit 22, connected to the second terminal of the temperature drift balancing unit 23 and the first terminal of the start-up unit 21.

[0092] In this embodiment, a first resistor, a second resistor, a first PNP transistor, and a second PNP transistor are configured in the current sustaining unit to form a proportional current mirror, thereby achieving proportional control of the current and providing a stable current at a specific ratio to the temperature drift balancing unit. One end of the first resistor is connected to one end of the second resistor and serves as the power supply terminal for the current sustaining unit, connected to the output terminal of the voltage protection module and the third terminal of the startup unit, respectively. The other end of the first resistor is connected to the emitter of the first PNP transistor, and the other end of the second resistor is connected to the emitter of the second PNP transistor. The bases of the first and second PNP transistors are connected, forming a current mirror with a shared base. The base and collector of the first PNP transistor are short-circuited, ensuring a specific proportional relationship between their collector current and emitter current to achieve the current mirror function. The collector of the first PNP transistor also serves as the first output terminal of the current sustaining unit, connected to the first terminal of the temperature drift balancing unit. The collector of the second PNP transistor serves as the second output terminal of the current sustaining unit, connected to the second terminal of the temperature drift balancing unit and the first terminal of the startup unit. A proportional current mirror provides the temperature drift balancing unit with a stable current of a specific ratio independent of the power supply voltage.

[0093] As an optional implementation, the startup unit 21 includes a first NPN transistor N1.

[0094] Optionally, continue to refer to Figure 3 The startup unit 21 includes a first NPN transistor N1, which is connected to the current sustaining unit 22, the temperature drift balancing unit 23, the startup bias module 1, and the voltage protection module 5.

[0095] The emitter of the first NPN transistor N1 is connected to the first output terminal of the startup bias module 1 and the third terminal of the temperature drift balancing unit 23. The base of the first NPN transistor N1 is connected to the second output terminal of the current sustaining unit 22 and the second terminal of the temperature drift balancing unit 23. The collector of the first NPN transistor N1 is connected to the power supply terminal of the current sustaining unit 22 and the output terminal of the voltage protection module 5.

[0096] Optionally, continue to refer to Figure 3The base of the first NPN transistor N1 serves as the first terminal of the startup unit 21, and is connected to the second output terminal of the current sustaining unit 22 and the second terminal of the temperature drift balancing unit 23, respectively. The emitter of the first NPN transistor N1 serves as the second terminal of the startup unit 21, and is connected to the first output terminal of the startup bias module 1 and the third terminal of the temperature drift balancing unit 23, respectively. The collector of the first NPN transistor N1 serves as the third terminal of the startup unit 21, and is connected to the power supply terminal of the current sustaining unit 22 and the output terminal of the voltage protection module 5, respectively. The first NPN transistor N1 is turned on only when the startup bias module 1 provides a startup voltage to the reference module 2, for rapid voltage boosting of the reference module 2. The first NPN transistor N1 is turned off when a stable reference voltage VOUT provides a startup voltage to the reference module 2.

[0097] In this embodiment, a first NPN transistor is provided in the startup unit. The base of the first NPN transistor serves as the first terminal of the startup unit, connected to the second output terminal of the current sustaining unit and the second terminal of the temperature drift balancing unit. The emitter of the first NPN transistor serves as the second terminal of the startup unit, connected to the first output terminal of the startup bias module and the third terminal of the temperature drift balancing unit. The collector of the first NPN transistor serves as the third terminal of the startup unit, connected to the power supply terminal of the current sustaining unit and the output terminal of the voltage protection module. The first NPN transistor conducts only when the startup bias module provides a startup voltage to the reference module, for rapid voltage boosting of the reference module. The first NPN transistor is turned off when a stable reference voltage provides a startup voltage to the reference module. During the initial startup phase of the reference module, the first NPN transistor conducts, rapidly boosting the voltage and improving the output efficiency of the balanced voltage.

[0098] Currently, most reference sources employ a bandgap reference structure. This is achieved by scaling and summing the base-emitter voltage (VBE) of a bipolar transistor with a negative temperature coefficient and the base-emitter voltage (VBE) of another bipolar transistor with a positive temperature coefficient, thus compensating for the temperature coefficient. However, this type of bandgap reference source still exhibits a relatively high rate of temperature change, resulting in low accuracy and reliability. The following section discusses... Figure 3 The reference module in the voltage reference source circuit of this application is explained in detail.

[0099] As an optional implementation, the temperature drift balancing unit 23 includes: a second NPN transistor N2, a third NPN transistor N3, a fourth NPN transistor N4, a first Zener diode Z1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a noise reduction port NOISEREDUCTION.

[0100] Optionally, continue to refer to Figure 3The temperature drift balancing unit 23 includes three NPN transistors, four resistors, one Zener diode, and one noise reduction port. These are, respectively, a second NPN transistor N2, a third NPN transistor N3, a fourth NPN transistor N4, a first Zener diode Z1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a noise reduction port (NOISEREDUCTION). The first Zener diode Z1 and the fourth, fifth, and sixth resistors R4, R5, and R6 all have positive temperature coefficients. The VBE of the third NPN transistor N3 and the fourth NPN transistor N4 both have negative temperature coefficients. By utilizing the positive temperature coefficients of the Zener diode and the resistors, as well as the negative temperature coefficients of the NPN transistors, the temperature coefficients cancel each other out, balancing the temperature drift. A stable, temperature-independent balanced voltage is output through the noise reduction port (NOISEREDUCTION). Based on the third NPN transistor N3, the fourth NPN transistor N4, the first Zener diode Z1, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 in the temperature drift balancing unit 23, the stability and reliability of the balancing voltage after temperature drift balancing can be improved, so as to output a more accurate and stable balancing voltage than the bandgap reference structure under different temperature environments.

[0101] For example, the first Zener diode Z1 can be a 6.1V Zener diode.

[0102] The collector of the second NPN transistor N2 is connected to the first output terminal of the current sustaining unit 22. The base of the second NPN transistor N2 is connected to the base of the third NPN transistor N3, the second terminal of the startup unit 21, the first output terminal of the startup bias module 1, and one end of the first Zener diode Z1. The emitter of the second NPN transistor N2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is grounded.

[0103] Optionally, continue to refer to Figure 3The collector of the second NPN transistor N2 serves as the first terminal of the temperature drift balancing unit 23 and is connected to the first output terminal of the current sustaining unit 22 to obtain a stable current provided by the current sustaining unit 22. The base of the second NPN transistor N2 is connected to the base of the third NPN transistor N3. The base of the second NPN transistor N2 and the base of the third NPN transistor N3 form another current mirror through a common base. This common base serves as the third terminal of the temperature drift balancing unit 23 and the first power supply terminal of the reference module 2, and is connected to the second terminal of the startup unit 21, the first output terminal of the startup bias module 1, and one end of the first Zener diode Z1, respectively. The emitter of the second NPN transistor N2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is grounded. The VBE of the second NPN transistor N2 and the VBE of the third NPN transistor N3 have negative temperature coefficients, while the first Zener diode Z1 has a positive temperature coefficient.

[0104] The collector of the third NPN transistor N3 is connected to the second output terminal of the current sustaining unit 22, and the emitter of the third NPN transistor N3 is connected to the collector of the fourth NPN transistor N4 and one end of the noise reduction port NOISEREDUCTION. The other end of the noise reduction port NOISEREDUCTION is connected to the non-inverting input terminal of the voltage regulation module 4.

[0105] Optionally, continue to refer to Figure 3 The collector of the third NPN transistor N3 serves as the second terminal of the temperature drift balancing unit 23 and is connected to the second output terminal of the current sustaining unit 22 to obtain another stable current provided by the current sustaining unit 22. The current obtained by the collector of the third NPN transistor N3 has a specific ratio to the current obtained by the collector of the second NPN transistor N2. The emitter of the third NPN transistor N3 is connected to the collector of the fourth NPN transistor N4 and one end of the noise reduction port NOISEREDUCTION. The other end of the noise reduction port NOISEREDUCTION serves as the fourth terminal of the temperature drift balancing unit 23 and the output terminal of the reference module 2, and is connected to the non-inverting input terminal of the voltage regulation module 4 to output a stable balanced voltage to the voltage regulation module 4 through the noise reduction port NOISEREDUCTION.

[0106] The base of the fourth NPN transistor N4 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6. The emitter of the fourth NPN transistor N4 and the other end of the sixth resistor R6 are grounded. The other end of the fifth resistor R5 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the other end of the first Zener diode Z1.

[0107] Optionally, continue to refer to Figure 3The base of the fourth NPN transistor N4 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, respectively. The emitter of the fourth NPN transistor N4 and the other end of the sixth resistor R6 are grounded. The other end of the fifth resistor R5 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the other end of the first Zener diode Z1. The fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the first Zener diode Z1 have positive temperature coefficients, while the VBE of the fourth NPN transistor N4 has a negative temperature coefficient. The positive temperature coefficients of the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the first Zener diode Z1 cancel out the negative temperature coefficients of the fourth NPN transistor N4 and the third NPN transistor N3, resulting in a balanced output voltage unaffected by temperature.

[0108] Specifically, the sixth resistor R6 is used to support the VBE voltage of the fourth NPN transistor N4. For example, if the balanced voltage output by reference module 2 is VBG, and the VBE voltages of the second NPN transistor N2, the third NPN transistor N3, and the fourth NPN transistor N4 are VBE2, VBE3, and VBE4 respectively, and the voltage across the first Zener diode Z1 is VZ1, then the balanced voltage VBG output by reference module 2 can be calculated based on the following formula:

[0109]

[0110] Among them, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the first Zener diode Z1 have positive temperature coefficients, while the VBE of the fourth NPN transistor N4 and the third NPN transistor N3 have negative temperature coefficients. Based on this, temperature coefficient cancellation is performed to output a balanced voltage VBG that is unaffected by temperature.

[0111] It is worth noting that since the second NPN transistor N2 and the third NPN transistor N3 are current mirrors sharing a common base, VBE2 = VBE3. The balanced voltage VBG output by the reference module 2 can also be calculated based on the following formula:

[0112]

[0113] Among them, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the first Zener diode Z1 have positive temperature coefficients, while the VBE of the fourth NPN transistor N4 and the second NPN transistor N2 have negative temperature coefficients. Based on this, temperature coefficient cancellation is performed to output a balanced voltage VBG that is unaffected by temperature.

[0114] In this embodiment, the temperature drift balancing unit includes a second NPN transistor, a third NPN transistor, a fourth NPN transistor, a first Zener diode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a noise reduction port. The collector of the second NPN transistor is connected to the first output terminal of the current sustaining unit. The base of the second NPN transistor is connected to the base of the third NPN transistor, the second terminal of the startup unit, the first output terminal of the startup bias module, and one end of the first Zener diode. The emitter of the second NPN transistor is connected to one end of the third resistor, and the other end of the third resistor is grounded. The collector of the third NPN transistor is connected to the second output terminal of the current sustaining unit. The emitter of the third NPN transistor is connected to the collector of the fourth NPN transistor and one end of the noise reduction port (NOISEREDUCTION). The other end of the noise reduction port (NOISEREDUCTION) is connected to the non-inverting input terminal of the voltage regulation module. The base of the fourth NPN transistor is connected to one end of the fifth resistor and one end of the sixth resistor. The emitter of the fourth NPN transistor and the other end of the sixth resistor are grounded. The other end of the fifth resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the other end of the first Zener diode. The first Zener diode, the fourth resistor, the fifth resistor, and the sixth resistor all have positive temperature coefficients. The VBE of the third NPN transistor and the fourth NPN transistor both have negative temperature coefficients. By using the positive temperature coefficients of the first Zener diode and the fourth, fifth, and sixth resistors, and the negative temperature coefficients of the VBE of the third and fourth NPN transistors, the temperature coefficients cancel each other out, balancing the temperature drift. A stable, temperature-independent balanced voltage is output through the noise reduction port. This reduces the complexity of the temperature drift balancing unit in the reference module and improves the temperature drift balancing effect and the stability of the balanced voltage.

[0115] Figure 4 This is another schematic diagram of the voltage reference source circuit provided in the embodiments of this application, as shown below. Figure 4 As shown, the voltage regulation module 4 includes a voltage regulation unit 41 and a reference voltage divider unit 42.

[0116] Optionally, refer to Figure 4 The voltage regulation module 4 includes two units: a voltage regulation unit 41 and a reference voltage divider unit 42. The voltage regulation unit 41 is connected to the reference module 2 to regulate the balanced voltage output by the reference module 2. The reference voltage divider unit 42 adjusts the voltage value output to the voltage protection module 5 through voltage division to improve the accuracy of the reference voltage OUT output.

[0117] The power supply terminal of voltage regulation unit 41 is connected to the second output terminal of startup bias module 1. The non-inverting input terminal of voltage regulation unit 41 is connected to the output terminal of reference module 2. The inverting input terminal of voltage regulation unit 41 is connected to the first terminal of reference voltage divider unit 42. The output terminal of voltage regulation unit 41 is connected to the second terminal of reference voltage divider unit 42 and the input terminal of voltage protection module 5. The third terminal of reference voltage divider unit 42 is connected to the voltage adjustment port TRIM, and the fourth terminal of reference voltage divider unit 42 is grounded.

[0118] Optionally, continue to refer to Figure 4 The voltage regulation unit 41 includes a non-inverting input, an inverting input, and a power supply terminal. The power supply terminal of the voltage regulation unit 41 serves as the power supply terminal for the voltage regulation module 4 and is connected to the second output terminal of the start-up bias module 1 to receive the electrical energy provided by the start-up bias module 1. The non-inverting input terminal of the voltage regulation unit 41 serves as the non-inverting input terminal of the voltage regulation module 4 and is connected to the output terminal of the reference module 2 to receive the temperature-independent balanced voltage output by the reference module 2. The inverting input terminal of the voltage regulation unit 41 is connected to the first terminal of the reference voltage divider unit 42. The third terminal of the reference voltage divider unit 42 serves as the inverting input terminal of the voltage regulation module 4 and is connected to the voltage adjustment port TRIM. The fourth terminal of the reference voltage divider unit 42 serves as the ground terminal of the voltage regulation module 4. The voltage regulation unit 41 regulates the temperature-independent balanced voltage output by the reference module 2, and the reference voltage divider unit 42 outputs the voltage value to the voltage protection module 5 through voltage division regulation.

[0119] In this embodiment, a voltage regulation unit and a reference voltage divider unit are included in the voltage regulation module. The power supply terminal of the voltage regulation unit is connected to the second output terminal of the start-up bias module. The non-inverting input terminal of the voltage regulation unit is connected to the output terminal of the reference module. The inverting input terminal of the voltage regulation unit is connected to the first terminal of the reference voltage divider unit. The output terminal of the voltage regulation unit is connected to the second terminal of the reference voltage divider unit and the input terminal of the voltage protection module. The third terminal of the reference voltage divider unit is connected to the voltage adjustment port, and the fourth terminal of the reference voltage divider unit is grounded. The voltage regulation unit adjusts the balanced voltage, and the reference voltage divider unit divides and adjusts the voltage value output to the voltage protection module, thereby improving the accuracy of the reference voltage output.

[0120] As an optional implementation, the voltage regulation unit 41 includes an operational amplifier A1.

[0121] Optionally, continue to refer to Figure 4 The voltage regulation unit 41 includes an operational amplifier A1, which includes a non-inverting input, an inverting input, and a power supply terminal.

[0122] The power supply terminal of operational amplifier A1 is connected to the second output terminal of the startup bias module 1. The non-inverting input terminal of operational amplifier A1 is connected to the output terminal of reference module 2. The inverting input terminal of operational amplifier A1 is connected to the first terminal of reference voltage divider unit 42. The output terminal of operational amplifier A1 is connected to the second terminal of reference voltage divider unit 42 and the input terminal of voltage protection module 5.

[0123] Optionally, continue to refer to Figure 4 The power supply terminal of operational amplifier A1 serves as the power supply terminal for voltage regulation unit 41 and voltage regulation module 4, and is connected to the second output terminal of startup bias module 1 to receive the electrical energy provided by startup bias module 1. The non-inverting input terminal of operational amplifier A1 serves as the non-inverting input terminal for voltage regulation unit 41 and voltage regulation module 4, and is connected to the output terminal of reference module 2 to receive the temperature-independent balanced voltage output by reference module 2. The inverting input terminal of operational amplifier A1 is connected to the first terminal of reference voltage divider unit 42. The output terminal of operational amplifier A1 serves as the power supply terminal for voltage regulation unit 41 and the output terminal of voltage regulation module 4, and is connected to the second terminal of reference voltage divider unit 42 and the input terminal of voltage protection module 5, respectively. Operational amplifier A1 is used to adjust the balanced voltage output by reference module 2, making the adjusted voltage output by operational amplifier A1 more consistent with the requirements of reference voltage VOUT.

[0124] In this embodiment, an operational amplifier is incorporated into the voltage regulation unit. The power supply terminal of the operational amplifier is connected to the second output terminal of the startup bias module. The non-inverting input terminal of the operational amplifier is connected to the output terminal of the reference module. The inverting input terminal of the operational amplifier is connected to the first terminal of the reference voltage divider unit. The output terminal of the operational amplifier is connected to the second terminal of the reference voltage divider unit and the input terminal of the voltage protection module. By adjusting the balanced voltage output by the reference module through the operational amplifier, the adjusted voltage output by the operational amplifier better meets the requirements of the reference voltage.

[0125] As an optional implementation, the reference voltage divider unit 42 includes: a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9.

[0126] Optionally, continue to refer to Figure 4 The reference voltage divider unit 42 includes three resistors: the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9. These three resistors are voltage divider resistors used to adjust the voltage value output to the voltage protection module 5, making the final output reference voltage VOUT more accurate.

[0127] One end of the seventh resistor R7 is connected to the output terminal of the voltage regulation unit 41 and the input terminal of the voltage protection module 5. The other end of the seventh resistor R7 is connected to the inverting input terminal of the voltage regulation unit 41, one end of the eighth resistor R8, and one end of the ninth resistor R9. The other end of the ninth resistor R9 is connected to the voltage adjustment port TRIM, and the other end of the eighth resistor R8 is grounded.

[0128] Optionally, continue to refer to Figure 4 One end of the seventh resistor R7 serves as the second end of the reference voltage divider unit 42, connected to the output terminal of the voltage regulation unit 41 and the input terminal of the voltage protection module 5. The other end of the seventh resistor R7 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9, and serves as the first end of the reference voltage divider unit 42, connected to the inverting input terminal of the voltage regulation unit 41. The other end of the ninth resistor R9 serves as the third end of the reference voltage divider unit 42 and the inverting input terminal of the voltage regulation module 4, connected to the voltage adjustment port TRIM, so as to adjust the amplitude of the reference voltage VOUT through the resistor connected to the voltage adjustment port TRIM. The other end of the eighth resistor R8 serves as the fourth end of the reference voltage divider unit 42 and the ground terminal of the voltage regulation module 4, grounded.

[0129] In this embodiment, a seventh resistor, an eighth resistor, and a ninth resistor are provided in the reference voltage divider unit. One end of the seventh resistor is connected to the output terminal of the voltage regulation unit and the input terminal of the voltage protection module. The other end of the seventh resistor is connected to the inverting input terminal of the voltage regulation unit, one end of the eighth resistor, and one end of the ninth resistor. The other end of the ninth resistor is connected to the voltage adjustment port to adjust the amplitude of the reference voltage through the resistor connected externally to the voltage adjustment port. The other end of the eighth resistor is grounded. By using the seventh, eighth, and ninth resistors in the reference voltage divider unit to adjust the voltage value output to the voltage protection module, the accuracy of the reference voltage output is improved.

[0130] As an optional implementation, the voltage reference source circuit also includes a first capacitor C1.

[0131] Optionally, continue to refer to Figure 4 The voltage reference source circuit also includes a first capacitor C1, which can be a silicon nitride capacitor. The first capacitor C1 improves the phase margin of the reference voltage VOUT and reduces the impact of voltage fluctuations on circuit performance.

[0132] One end of the first capacitor C1 is connected to the output terminal of the voltage regulation module 4 and the input terminal of the voltage protection module 5. The other end of the first capacitor C1 is connected to the output terminal of the voltage protection module 5.

[0133] Optionally, continue to refer to Figure 4One end of the first capacitor C1 is connected to the output terminal of the voltage regulation module 4 and the input terminal of the voltage protection module 5, respectively, and the other end is connected to the output terminal of the voltage protection module 5. That is, the first capacitor C1 is connected in parallel with the voltage protection module 5 to improve the phase margin of the reference voltage VOUT, so as to reduce the impact of voltage fluctuations on circuit performance and improve the overall stability and reliability of the reference source circuit.

[0134] In this embodiment, a first capacitor is included in the voltage reference source circuit. One end of the first capacitor is connected to the output terminal of the voltage regulation module and the input terminal of the voltage protection module, respectively, and the other end is connected to the output terminal of the voltage protection module. By connecting the first capacitor in parallel with the voltage protection module, the phase margin of the reference voltage is improved, the impact of voltage fluctuations on circuit performance is reduced, the overall stability and reliability of the reference source circuit are improved, and thus the output quality of the reference voltage is enhanced.

[0135] This application also provides a reference chip, which includes the voltage reference source circuit described in the foregoing embodiments.

[0136] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A voltage reference source circuit, characterized in that, include: Start-up bias module, reference module, voltage regulator module, voltage regulation module and voltage protection module; The input terminal of the startup bias module is connected to the power supply voltage. The first output terminal of the startup bias module is connected to the first power supply terminal of the reference module and one end of the voltage regulator module. The second output terminal of the startup bias module is connected to the power supply terminal of the voltage regulation module and the power supply terminal of the voltage protection module. The other end of the voltage regulator module is grounded. The second power supply terminal of the reference module is connected to the output terminal of the voltage protection module, the output terminal of the reference module is connected to the non-inverting input terminal of the voltage regulation module, and the ground terminal of the reference module is grounded. The inverting input terminal of the voltage regulation module is connected to the voltage adjustment port of the voltage reference source circuit, the output terminal of the voltage regulation module is connected to the input terminal of the voltage protection module, and the ground terminal of the voltage regulation module is grounded. The startup bias module is used to provide a startup voltage to the reference module when the voltage protection module does not output a stable reference voltage, and to supply power to the voltage regulation module and the voltage protection module. The reference module is used to balance temperature drift and output a balanced voltage when powered by the start-up voltage or the reference voltage. The voltage regulation module is used to regulate the balanced voltage; The voltage protection module is used for overcurrent protection and outputs a stable reference voltage.

2. The circuit according to claim 1, characterized in that, The reference module includes: a startup unit, a current maintenance unit, and a temperature drift balancing unit; The first output terminal of the current sustaining unit is connected to the first terminal of the temperature drift balancing unit, the second output terminal of the current sustaining unit is connected to the second terminal of the temperature drift balancing unit and the first terminal of the starting unit, and the power supply terminal of the current sustaining unit is connected to the third terminal of the starting unit and the output terminal of the voltage protection module. The second end of the starting unit is connected to the first output end of the starting bias module and the third end of the temperature drift balancing unit; The fourth terminal of the temperature drift balancing unit is connected to the non-inverting input terminal of the voltage regulation module, and the fifth terminal of the temperature drift balancing unit is grounded.

3. The circuit according to claim 2, characterized in that, The current sustaining unit includes: a first resistor, a second resistor, a first PNP transistor, and a second PNP transistor; One end of the first resistor is connected to one end of the second resistor, the output terminal of the voltage protection module, and the third terminal of the startup unit; the other end of the first resistor is connected to the emitter of the first PNP transistor. The other end of the second resistor is connected to the emitter of the second PNP transistor; The base of the first PNP transistor is short-circuited to the collector of the first PNP transistor, and the base of the first PNP transistor is connected to the base of the second PNP transistor. The collector of the first PNP transistor is connected to the first end of the temperature drift balancing unit. The collector of the second PNP transistor is connected to the second terminal of the temperature drift balancing unit and the first terminal of the startup unit.

4. The circuit according to claim 2, characterized in that, The startup unit includes a first NPN transistor; The emitter of the first NPN transistor is connected to the first output terminal of the startup bias module and the third terminal of the temperature drift balancing unit; The base of the first NPN transistor is connected to the second output terminal of the current sustaining unit and the second terminal of the temperature drift balancing unit; The collector of the first NPN transistor is connected to the power supply terminal of the current sustaining unit and the output terminal of the voltage protection module.

5. The circuit according to claim 2, characterized in that, The temperature drift balancing unit includes: a second NPN transistor, a third NPN transistor, a fourth NPN transistor, a first Zener diode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a noise reduction port; The collector of the second NPN transistor is connected to the first output terminal of the current sustaining unit, the base of the second NPN transistor is connected to the base of the third NPN transistor, the second terminal of the startup unit, the first output terminal of the startup bias module, and one end of the first Zener diode, the emitter of the second NPN transistor is connected to one end of the third resistor, and the other end of the third resistor is grounded. The collector of the third NPN transistor is connected to the second output terminal of the current sustaining unit, the emitter of the third NPN transistor is connected to the collector of the fourth NPN transistor and one end of the noise reduction port, and the other end of the noise reduction port is connected to the non-inverting input terminal of the voltage regulation module. The base of the fourth NPN transistor is connected to one end of the fifth resistor and one end of the sixth resistor, and the emitter of the fourth NPN transistor and the other end of the sixth resistor are grounded. The other end of the fifth resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the other end of the first Zener diode.

6. The circuit according to claim 1, characterized in that, The voltage regulation module includes: a voltage regulation unit and a reference voltage divider unit; The power supply terminal of the voltage regulation unit is connected to the second output terminal of the start-up bias module, the non-inverting input terminal of the voltage regulation unit is connected to the output terminal of the reference module, the inverting input terminal of the voltage regulation unit is connected to the first terminal of the reference voltage divider unit, and the output terminal of the voltage regulation unit is connected to the second terminal of the reference voltage divider unit and the input terminal of the voltage protection module. The third terminal of the reference voltage divider unit is connected to the voltage adjustment port, and the fourth terminal of the reference voltage divider unit is grounded.

7. The circuit according to claim 6, characterized in that, The voltage regulation unit includes an operational amplifier; The power supply terminal of the operational amplifier is connected to the second output terminal of the startup bias module; The non-inverting input of the operational amplifier is connected to the output of the reference module; The inverting input terminal of the operational amplifier is connected to the first terminal of the reference voltage divider unit; The output terminal of the operational amplifier is connected to the second terminal of the reference voltage divider unit and the input terminal of the voltage protection module.

8. The circuit according to claim 6, characterized in that, The reference voltage divider unit includes: a seventh resistor, an eighth resistor, and a ninth resistor; One end of the seventh resistor is connected to the output terminal of the voltage regulation unit and the input terminal of the voltage protection module, and the other end of the seventh resistor is connected to the inverting input terminal of the voltage regulation unit, one end of the eighth resistor, and one end of the ninth resistor. The other end of the ninth resistor is connected to the voltage adjustment port, and the other end of the eighth resistor is grounded.

9. The circuit according to claim 1, characterized in that, The circuit also includes a first capacitor; One end of the first capacitor is connected to the output terminal of the voltage regulation module and the input terminal of the voltage protection module; The other end of the first capacitor is connected to the output terminal of the voltage protection module.

10. A reference chip, characterized in that, Includes the voltage reference source circuit as described in any one of claims 1-9.

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