CN114995570A - High-precision low-temperature-drift reference voltage circuit and debugging method thereof - Google Patents
High-precision low-temperature-drift reference voltage circuit and debugging method thereof Download PDFInfo
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- CN114995570A CN114995570A CN202210657049.9A CN202210657049A CN114995570A CN 114995570 A CN114995570 A CN 114995570A CN 202210657049 A CN202210657049 A CN 202210657049A CN 114995570 A CN114995570 A CN 114995570A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
Abstract
The invention relates to a high-precision low-temperature drift reference voltage circuit and a debugging method thereof, and aims to solve the technical problems that an existing reference voltage generating circuit is poor in precision and high in voltage drift value along with temperature change. The input end of the emitter follower in the circuit is connected with an external power supply; the output end of the operational amplifier is connected with the control end of the emitter output device; the negative electrode of the voltage-stabilizing tube is simultaneously connected with the first end of the first adjustable resistor and the non-inverting input end of the operational amplifier, and the other end of the voltage-stabilizing tube is grounded; the first end of the second adjustable resistor is connected with the constant value resistor R1 and the inverting input end of the operational amplifier, and the other end of the second adjustable resistor is grounded. The method comprises the following steps: 1. acquiring a temperature-current curve of a voltage stabilizing tube; 2. determining target current and corresponding reference voltage of a voltage regulator tube; 3. adjusting the first adjustable resistor to enable the voltage regulator tube to output stable reference voltage; and adjusting the second voltage division unit to enable the voltage of the output end of the emitter follower to be the required reference voltage.
Description
Technical Field
The invention relates to a reference voltage circuit and a debugging method, in particular to a high-precision low-temperature drift reference voltage circuit and a debugging method thereof.
Background
The reference voltage generating circuit is a basic module unit in analog circuit design, mixed signal circuit design and digital design, and is used for providing a reference voltage which does not change along with temperature and power supply voltage for a system. In the reference voltage generating circuit, two parameters, namely, a Temperature Coefficient (TC) and a Power Supply Rejection Ratio (PSRR), play a decisive role in the performance of the Power Supply, and the reference voltage generating circuit with high precision, low Power consumption, a high Power Supply Rejection Ratio and a low Temperature Coefficient is very important for the whole circuit. The conventional bandgap reference voltage can be obtained by linearly superposing two voltages with positive and negative temperature coefficients. Because the traditional reference voltage generating circuit only performs linear compensation, the precision is poor, the generated voltage is usually not ideal when the temperature range is changed greatly, and especially in some circuits with higher requirements on voltage precision, the voltage generated after the linear compensation can not meet the requirements far away. Based on the circuit, the invention provides the reference voltage generating circuit with higher precision and low temperature drift.
Disclosure of Invention
The invention aims to solve the technical problems that an existing reference voltage generating circuit is poor in precision and high in voltage drift value along with temperature change, and provides a high-precision low-temperature drift reference voltage circuit and a debugging method thereof.
The technical scheme of the invention is as follows:
a high-precision low-temperature drift reference voltage circuit is characterized in that: comprises an emitter follower, an operational amplifier, a first voltage division unit and a second voltage division unit;
the input end of the emitter output device is connected with an external positive power supply, and the output end of the emitter output device is a reference voltage output end;
the output end of the operational amplifier is connected with the control end of the emitter output device; the positive power input end of the operational amplifier is connected with an external positive power supply, and the negative power input end of the operational amplifier is connected with an external negative power supply;
the first voltage division unit comprises a voltage-regulator tube and a first adjustable resistor which are connected in series; the positive electrode of the voltage-regulator tube is connected with GND, and the negative electrode of the voltage-regulator tube is simultaneously connected with the first end of the first adjustable resistor and the non-inverting input end of the operational amplifier; the second end of the first adjustable resistor is connected with the output end of the emitter follower;
the second voltage division unit comprises a second adjustable resistor and a fixed resistor R1 which are connected in series, wherein the first end of the second adjustable resistor is connected with GND, and the second end of the second adjustable resistor is connected with the first end of the constant value resistor R1 and the inverting input end of the operational amplifier; the second terminal of the fixed resistor R1 is connected to the output terminal of the emitter follower.
Furthermore, the voltage-stabilizing tube comprises a silicon voltage-stabilizing tube and a silicon diode, and the silicon voltage-stabilizing tube and the silicon diode are reversely connected in series.
Further, the output voltage of the voltage stabilizing tube is 6.2V-6.5V.
Further, the first adjustable resistor comprises an adjustable resistor RA and a fixed resistor R2 which are connected in series;
the adjustable resistor RA comprises an adjustable resistor RA1 and an adjustable resistor RA2 which are connected in parallel;
the adjustable resistor RA1 and the adjustable resistor RA2 both meet the temperature coefficient of less than 15 PPM/DEG C, and the precision is less than 0.1%.
Further, the second adjustable resistor comprises an adjustable resistor RB and a fixed resistor R3 which are connected in parallel;
the adjustable resistor RB comprises an adjustable resistor RB1 and an adjustable resistor RB2 which are connected in series;
the adjustable resistor RB1 and the adjustable resistor RB2 both meet the temperature coefficient of less than 15 PPM/DEG C, and the precision is less than 0.1%.
Furthermore, the device also comprises a triode with reverse bias, wherein the collector of the triode is connected with the output end of the operational amplifier, and the emitter and the base of the triode are both connected with the inverting input end of the operational amplifier.
Furthermore, the device also comprises a reverse biased diode, wherein the anode of the diode is connected with GND, and the cathode of the diode is connected with the output end of the emitter follower.
Further, the high-voltage power supply further comprises a first capacitor C1 and a second capacitor C2, wherein one end of the first capacitor C1 is connected with the positive end of the power supply input of the operational amplifier, and the other end of the first capacitor C1 is connected with GND; one end of the second capacitor C2 is connected to the negative power input terminal of the operational amplifier, and the other end is connected to GND.
Meanwhile, the invention also provides a debugging method of the high-precision low-temperature-drift reference voltage circuit, which is based on the high-precision low-temperature-drift reference voltage circuit and comprises the following steps:
s1, obtaining a temperature-current curve of the voltage-stabilizing tube;
s2, determining the target current of the voltage regulator tube and the corresponding reference voltage according to the temperature and the temperature-current curve of the voltage regulator tube;
s3, establishing a reference voltage circuit, adjusting a first adjustable resistor according to the target current, and enabling the output of a voltage stabilizing tube to be stable in reference voltage, wherein the reference voltage is the same as the voltage of the non-inverting input end of the operational amplifier;
and S4, adjusting the second adjustable resistor to realize the adjustment of the voltage of the inverting input terminal of the operational amplifier, so that the voltage of the output terminal of the emitter follower is the required reference voltage.
Further, in step S3, the reference voltage is 6.2V to 6.5V.
The invention has the beneficial effects that:
1. according to the invention, the reference voltage source is formed by the voltage-regulator tube and the first adjustable resistor which are connected in series, so that the stability of the output reference voltage of the voltage-regulator tube is ensured, and further, the stability of the reference voltage formed by the high-precision low-temperature drift reference voltage circuit is ensured.
2. According to the method, the current with the minimum temperature correlation is determined as the target current by constructing the temperature-current curve of the voltage regulator tube, so that the first adjustable resistor is adjusted to ensure stable reference voltage output, and the drift amplitude of the reference voltage output by the reference voltage circuit along with the temperature change is reduced.
3. The invention prevents the circuit from realizing automatic regulation when the operational amplifier outputs negative voltage by arranging the reverse biased triode in the circuit, thereby ensuring the normal operation of the reference voltage circuit.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a high-precision low-temperature-drift reference voltage circuit according to the present invention;
FIG. 2 is a simplified circuit diagram according to an embodiment of the present invention.
The reference numbers are as follows:
the circuit comprises a 1-emitter follower, a 2-operational amplifier, a 3-voltage regulator tube, a 4-triode, a 5-diode, a 6-first adjustable resistor and a 7-second adjustable resistor.
Detailed Description
Referring to fig. 1, the present embodiment provides a high-precision low-temperature drift reference voltage circuit, which includes an emitter follower 1, an operational amplifier 2, a first voltage dividing unit, a second voltage dividing unit, a transistor 4, a diode 5, a first capacitor C1, and a second capacitor C2.
The input end of the emitter follower 1 is connected with an external positive power supply, and the output end of the emitter follower is a reference voltage output end; the output end of the operational amplifier 2 is connected with the control end of the emitter follower 1, the positive power input end of the operational amplifier 2 is connected with an external positive power supply, and the negative power input end is connected with an external negative power supply.
The first voltage division unit comprises a voltage regulator tube 3 and a first adjustable resistor 6 which are connected in series; the voltage-stabilizing tube 3 comprises a silicon voltage-stabilizing tube and a silicon diode which are reversely connected in series; the positive pole of the voltage-regulator tube 3 is connected with GND, and the negative pole of the voltage-regulator tube 3 is connected with the first end of the first adjustable resistor 6 and the non-inverting input end of the operational amplifier 2; the second end of the first adjustable resistor 6 is connected with the output end of the emitter follower 1; the voltage-regulator tube 3 and the first adjustable resistor 6 form a reference voltage source, and the stability of the output voltage of the voltage-regulator tube 3 determines the stability of the output voltage of the finally formed reference voltage circuit. Specifically, the first adjustable resistor 6 comprises an adjustable resistor RA and a fixed resistor R2 which are connected in series; the adjustable resistor RA comprises an adjustable resistor RA1 and an adjustable resistor RA2 which are connected in parallel, the adjustable resistor RA1 and the adjustable resistor RA2 both meet the condition that the temperature coefficient is less than 15 PPM/DEG C, and the precision is less than 0.1%.
The second voltage division unit comprises a second adjustable resistor 7 and a fixed resistor R1 which are connected in series, wherein a first end of the second adjustable resistor 7 is connected with GND, and a second end of the second adjustable resistor 7 is connected with a first end of a constant-value resistor R1 and an inverting input end of the operational amplifier 2; the second terminal of the fixed resistor R1 is connected to the output terminal of the emitter follower 1. Specifically, the second adjustable resistor 7 comprises an adjustable resistor RB and a fixed-value resistor R3 which are connected in parallel; the adjustable resistor RB comprises an adjustable resistor RB1 and an adjustable resistor RB2 which are connected in series, the adjustable resistor RB1 and the adjustable resistor RB2 both meet the condition that the temperature coefficient is less than 15 PPM/DEG C, and the precision is less than 0.1%.
The collector of the triode 4 is connected with the output end of the operational amplifier 2, and the emitter and the base of the triode 4 are both connected with the inverting input end of the operational amplifier 2.
A first terminal of the diode 5 is connected to GND, and a second terminal of the diode 5 is connected to the output terminal of the emitter follower 1.
One end of the first capacitor C1 is connected with the positive end of the power supply input of the operational amplifier 2, and the other end is connected with GND; one end of the second capacitor C2 is connected with the negative power input end of the operational amplifier 2, and the other end is connected with GND; the first capacitor C1 and the second capacitor C2 are used for filtering.
The debugging method of the high-precision low-temperature drift reference voltage circuit comprises the following steps:
s1, acquiring a temperature-current curve of the voltage-stabilizing tube 3;
s2, determining the target current of the voltage regulator tube 3 and the corresponding reference voltage according to the current temperature and the temperature-current curve of the voltage regulator tube 3;
s3, establishing a reference voltage circuit, adjusting the first adjustable resistor 6 according to the target current, and enabling the output of the voltage-stabilizing tube 3 to be stable to obtain a reference voltage, wherein the reference voltage is the same as the voltage of the in-phase input end of the operational amplifier 2;
s4, adjusting the second adjustable resistor 7 to realize the adjustment of the voltage V-of the inverting input end of the operational amplifier 2, so that the output end voltage of the emitter follower 1 is the required reference voltage.
To further explain the high-precision low-temperature drift reference voltage circuit, a reference voltage with an output of 10V is specifically explained as an example.
Referring to fig. 1, a reference voltage source is formed by the voltage regulator tube 3, the adjustable resistor RA1, the adjustable resistor RA2 and the fixed resistor R2; the working voltage (i.e., reverse breakdown voltage) of the voltage-regulator tube 3 changes with the change of temperature, and even if the working current is constant, the voltage fluctuates, generally, the voltage-regulator tube 3 higher than 5V has a positive temperature coefficient, and the voltage-regulator tube 3 lower than 5V has a negative temperature coefficient. In the voltage-stabilizing tube 3 in the embodiment, a 5.5V silicon voltage-stabilizing tube and a silicon diode are connected in series in a reverse direction, when the voltage-stabilizing tube works, the silicon voltage-stabilizing tube is in reverse breakdown, the silicon diode works in forward conduction, the silicon voltage-stabilizing tube shows certain forward change, the silicon diode shows certain negative change, the two changes are approximately offset, so that the total voltage is almost unchanged, and particularly stable reference voltage output is obtained. The output reference voltage of the voltage stabilizing tube 3 is generally 6.2V-6.5V, and the stability of the reference voltage determines the stability of the finally formed +10.00V reference voltage.
Before the voltage-stabilizing tube 3 is assembled into a circuit, measuring a temperature-current curve of the voltage-stabilizing tube 3, and selecting a current corresponding to the highest voltage stability as a target current and a corresponding voltage as a reference voltage according to the temperature-current curve of the voltage-stabilizing tube 3; in the embodiment, the target current of the voltage regulator tube 3 is 1mA, and the voltage regulator tube works on the current, so that the reference voltage obtained in the full-temperature range is more stable, and the voltage variation range is as low as 0-2 mV.
And a reference voltage circuit is established, and the circuit power supply voltage E of the voltage-regulator tube 3 must be sufficiently stable according to the selected optimal working current 1mA of the voltage-regulator tube 3, the reference voltage 6.2V and the like, otherwise, the working current cannot be ensured to be stable. Calculating the equivalent resistance of the first adjustable resistor 6: r ═ 3.8K Ω/1mA ═ 10V-6.2V; adjusting the adjustable resistor RA1 and the adjustable resistor RA2 to meet the equivalent resistance value of the first adjustable resistor 6; the adjustable resistor RA1, the adjustable resistor RA2 and the fixed resistor R2 are all high-temperature resistors, namely resistors with small temperature coefficients, generally requiring the temperature coefficient to be less than 15 PPM/DEG C and the precision to be less than 0.1%.
The V + of the operational amplifier 2 is 6.20V, the V-of the operational amplifier 2 is 6.20V, the operating voltage drop of the emitter follower 1 itself in the present embodiment is 0.5V, the second adjustable resistor 7 is adjusted to make the output voltage of the operational amplifier 2 10.5V, and therefore the voltage output through the emitter follower 1 is stabilized at +10V, that is, the reference voltage V 0 Is 10V.
When the 10V reference voltage circuit works normally, the triode 4 and the diode 5 are in reverse bias and are not conducted, namely, the triode 4 and the diode 5 are not available, so that the circuit is considered to be open. When the circuit enters an abnormal state, i.e., the output voltage of the operational amplifier 2 is-13V (saturated output), the emitter follower 1 is caused to turn off. Reference voltage V 0 When V + is 0 and V-is 0, the output voltage of the operational amplifier 2 stays at-13V, and the circuit is no longer closed loop since the emitter follower 1 remains off. This abnormal state is overcome by the addition of a reverse biased transistor 4. After the transistor 4 is reversely biased, when the output voltage of the operational amplifier 2 jumps to-13V, the transistor 4 is conducted, the V-of the operational amplifier 2 is pulled low, V-<V + and the output voltage of the operational amplifier 2 is instantly converted into positive voltage, the triode 4 is not conducted, the emitter follower 1 is conducted, and the reference voltage V 0 Enters into positive voltage and ensures V +>V-, the output voltage of the operational amplifier 2 is positive, so that the emitter follower 1 continues to be in an amplified state, and the whole power is suppliedThe circuit is in closed loop and reference voltage V 0 Is adjusted to + 10V.
The 10V reference voltage source adopts a voltage-regulator tube 3 to form a high-stability reference voltage source which passes through an operational amplifier 2 (composed of+15V public power supply), the emitter follower 1 outputs +10.00V reference voltage with standard stability and enough load capacity; the 10.00V reference voltage is at full temperature (0-135℃)
Internal change<+5mV and has sufficient loading capacity.
Referring to fig. 2, the 10V reference voltage circuit is simplified. The emitter follower 1 can make the output voltage of the operational amplifier 2 not change with the change of the load, and the voltage stabilizing principle of the reference voltage circuit is as follows: when the load is heavy, the reference voltage V 0 It is lowered, in which case V + of the operational amplifier 2 is not changed, and V-of the operational amplifier 2 is lowered, resulting in an increase in the output of the emitter follower 1, so that the reference voltage V is set 0 Increase, the end result being a reference voltage V 0 The stability is basically kept; on the contrary, if the load becomes light, the reference voltage V 0 The increasing trend is followed, and the V-of the operational amplifier 2 is increased, which causes the output of the emitter follower 1 to decrease, thereby causing the reference voltage V 0 Decrease, the final resulting reference voltage V 0 Remains substantially stable, so that the reference voltage V 0 Is automatically stabilized. This is a DC voltage-stabilizing negative feedback circuit, because the operational amplifier 2 works in open loop, the voltage gain is very large, and the reference voltage V 0 A high degree of stability is obtained.
V of emitter follower 1 be The voltage drop, even if changed, will not affect the reference voltage V 0 Because the operational amplifier 2 works in an open-loop state, the voltage gain is very large (≈ infinity), the voltage division ratio between the second adjustable resistor 7 and the fixed resistor R1 of the second voltage division unit must be highly stable, a precise high-temperature resistor is needed, the temperature coefficient is generally required to be less than 15 PPM/degree centigrade, and the precision is less than 0.1%.
The operational amplifier 2 works in open loop, the voltage gain is very large, so V + is approximately equal to V-, which is equivalent to virtual short circuit. The input current of the V + end of the operational amplifier 2 is very small, and the reference power supply is nearly no-load; reference voltage of 10VV 0 Besides being used for circuits of temperature measurement, pressure measurement and the like of the three-parameter plate, the working current of the voltage-stabilizing tube 3 is stabilized.
Claims (10)
1. A high-precision low-temperature drift reference voltage circuit is characterized in that: comprises an emitter follower (1), an operational amplifier (2), a first voltage division unit and a second voltage division unit;
the input end of the emitter follower (1) is connected with an external positive power supply, and the output end of the emitter follower is a reference voltage output end;
the output end of the operational amplifier (2) is connected with the control end of the emitter follower (1); the positive end of the power supply input of the operational amplifier (2) is connected with an external positive power supply, and the negative end of the power supply input is connected with an external negative power supply;
the first voltage division unit comprises a voltage regulator tube (3) and a first adjustable resistor (6) which are connected in series; the positive electrode of the voltage regulator tube (3) is connected with GND, and the negative electrode of the voltage regulator tube (3) is simultaneously connected with the first end of the first adjustable resistor (6) and the non-inverting input end of the operational amplifier (2); the second end of the first adjustable resistor (6) is connected with the output end of the emitter follower (1);
the second voltage division unit comprises a second adjustable resistor (7) and a fixed resistor R1 which are connected in series, wherein the first end of the second adjustable resistor (7) is connected with GND, and the second end of the second adjustable resistor (7) is simultaneously connected with the first end of the fixed resistor R1 and the inverting input end of the operational amplifier (2); the second terminal of the fixed resistor R1 is connected to the output terminal of the emitter follower (1).
2. The high-precision low-temperature-drift reference voltage circuit according to claim 1, characterized in that:
the voltage-stabilizing tube (3) comprises a silicon voltage-stabilizing tube and a silicon diode, and the silicon voltage-stabilizing tube and the silicon diode are reversely connected in series.
3. The high-precision low-temperature-drift reference voltage circuit according to claim 2, characterized in that:
the output voltage of the voltage-stabilizing tube (3) is 6.2V-6.5V.
4. The high-precision low-temperature-drift reference voltage circuit according to claim 3, characterized in that:
the first adjustable resistor (6) comprises an adjustable resistor RA and a fixed resistor R2 which are connected in series;
the adjustable resistor RA comprises an adjustable resistor RA1 and an adjustable resistor RA2 which are connected in parallel;
the adjustable resistor RA1 and the adjustable resistor RA2 both meet the temperature coefficient of less than 15 PPM/DEG C, and the precision is less than 0.1%.
5. The high-precision low-temperature-drift reference voltage circuit according to claim 4, wherein:
the second adjustable resistor (7) comprises an adjustable resistor RB and a fixed-value resistor R3 which are connected in parallel;
the adjustable resistor RB comprises an adjustable resistor RB1 and an adjustable resistor RB2 which are connected in series;
the adjustable resistor RB1 and the adjustable resistor RB2 both meet the temperature coefficient of less than 15 PPM/DEG C, and the precision is less than 0.1%.
6. A high accuracy low temperature drift reference voltage circuit according to any one of claims 1-5, characterized in that:
the power amplifier further comprises a reverse bias triode (4), wherein a collector of the triode (4) is connected with the output end of the operational amplifier (2), and an emitter and a base of the triode (4) are both connected with the inverting input end of the operational amplifier (2).
7. The high-precision low-temperature-drift reference voltage circuit according to claim 6, characterized in that:
the emitter follower further comprises a reverse bias diode (5), the anode of the diode (5) is connected with GND, and the cathode of the diode (5) is connected with the output end of the emitter follower (1).
8. The high-precision low-temperature-drift reference voltage circuit according to claim 7, characterized in that:
the high-voltage power supply further comprises a first capacitor C1 and a second capacitor C2, wherein one end of the first capacitor C1 is connected with the positive end of the power supply input of the operational amplifier (2), and the other end of the first capacitor C1 is connected with GND; one end of the second capacitor C2 is connected with the negative end of the power input of the operational amplifier (2), and the other end is connected with GND.
9. A debugging method of a high-precision low-temperature drift reference voltage circuit is based on the high-precision low-temperature drift reference voltage circuit of any one of claims 1-8, and comprises the following steps:
s1, acquiring a temperature-current curve of the voltage-stabilizing tube (3);
s2, determining the target current and the corresponding reference voltage of the voltage regulator tube (3) according to the temperature and the temperature-current curve of the voltage regulator tube (3);
s3, establishing a reference voltage circuit, adjusting a first adjustable resistor (6) according to the target current, and enabling the output of a voltage regulator tube (3) to be stable as a reference voltage, wherein the reference voltage is the same as the voltage of the non-inverting input end of the operational amplifier (2);
and S4, adjusting the voltage of the inverting input end of the operational amplifier (2) by adjusting the second adjustable resistor (7), so that the voltage of the output end of the emitter output device (1) is the required reference voltage.
10. The method for debugging a high-precision low-temperature-drift reference voltage circuit according to claim 9, comprising:
in step S3, the reference voltage is 6.2V to 6.5V.
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| CN202210657049.9A CN114995570A (en) | 2022-06-10 | 2022-06-10 | High-precision low-temperature-drift reference voltage circuit and debugging method thereof |
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| CN202210657049.9A CN114995570A (en) | 2022-06-10 | 2022-06-10 | High-precision low-temperature-drift reference voltage circuit and debugging method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494900A (en) * | 2022-09-22 | 2022-12-20 | 上海概伦电子股份有限公司 | Reference voltage extension method, system, device, and computer-readable storage medium |
| CN116995906A (en) * | 2023-07-11 | 2023-11-03 | 江苏展芯半导体技术有限公司 | Peak voltage suppression circuit |
-
2022
- 2022-06-10 CN CN202210657049.9A patent/CN114995570A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494900A (en) * | 2022-09-22 | 2022-12-20 | 上海概伦电子股份有限公司 | Reference voltage extension method, system, device, and computer-readable storage medium |
| CN115494900B (en) * | 2022-09-22 | 2024-02-06 | 上海概伦电子股份有限公司 | Reference voltage expansion method, system, apparatus, and computer-readable storage medium |
| CN116995906A (en) * | 2023-07-11 | 2023-11-03 | 江苏展芯半导体技术有限公司 | Peak voltage suppression circuit |
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