CN114326890B - Voltage regulating circuit - Google Patents
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- CN114326890B CN114326890B CN202011053533.8A CN202011053533A CN114326890B CN 114326890 B CN114326890 B CN 114326890B CN 202011053533 A CN202011053533 A CN 202011053533A CN 114326890 B CN114326890 B CN 114326890B
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Abstract
The invention relates to the technical field of electronic circuits, and provides a voltage regulating circuit for supplying power to a chip internal circuit, which comprises: an error amplifier connected between the supply terminal and ground, the error amplifier having a first output terminal and a second output terminal for providing a first control signal via the first output terminal or a second control signal via the second output terminal based on a comparison of a reference voltage and a feedback voltage; the first transistor is connected between the power supply end and the output end of the voltage regulating circuit, and the control end of the first transistor is connected with the first output end of the error amplifier; the second transistor is connected in parallel with two ends of the first transistor, and the control end of the second transistor is connected with the second output end of the error amplifier; and a feedback control module for providing the feedback voltage. Therefore, the circuit response speed of the chip during power-on can be improved, and the high precision of the circuit is ensured.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a voltage regulating circuit.
Background
The voltage regulating circuit is very widely applied, and particularly in a high-voltage product, the voltage regulating circuit is almost adopted to convert high voltage into low voltage for supplying power to a chip, so most circuits in the chip can be built by adopting low-voltage devices, the cost can be saved, the precision can be improved, and the reliability can be higher. However, some chips have an indication function, and a correct indication can be given by powering on the chip, but the voltage regulation circuit usually has a setup time, which is equivalent to a time period when no voltage source is provided inside the chip, so that a correct indication cannot be given, and a short indication error occurs when the chip is powered on.
Referring to fig. 1, a voltage regulation circuit 100 disclosed in the prior art includes: the operational amplifier 110 and the field effect transistor Mp3 connected between the input terminal and the signal ground, the first resistor R11, and the second resistor R12, specifically, the operational amplifier 110 includes: the field-effect transistor Mp1, the field-effect transistor Mp2, the field-effect transistor Mn1, the field-effect transistor Mn2 and the current source I1, the source electrodes of the field-effect transistor Mp1 and the field-effect transistor Mp2 are connected to the input end together, the input signal VIN is accessed, the grid electrodes are connected to the drain electrode of the field-effect transistor Mp1 together, the drain electrode of the field-effect transistor Mp1 is connected to the drain electrode of the field-effect transistor Mn1, the drain electrode of the field-effect transistor Mp2 is connected to the drain electrode of the field-effect transistor Mn2, the source electrode of the field-effect transistor Mn1 is connected to the source electrode of the field-effect transistor Mn2 and is connected to the signal ground through the current source I1, wherein the grid electrode of the field-effect transistor Mn2 is used as the first input end of the operational amplifier 110 and is connected to the reference voltage Vref, and the grid electrode of the field-effect transistor Mn1 is used as the second input end of the operational amplifier 110 and is connected to the feedback voltage VFB provided by the connection node between the first resistor R11 and the second resistor R12; the connection node of the fet Mp2 and the fet Mn2 serves as the output terminal Vout0 of the operational amplifier 110, while the gate of the fet Mp3 is connected to the output terminal of the operational amplifier 110 and the source is connected to the input terminal VIN; one end of the first resistor R11 is connected with the drain electrode of the field effect transistor Mp3, and the other end of the first resistor R11 is connected with the second resistor R12; a second resistor R12 connected between the first resistor R11 and signal ground; the connection node between the first resistor R11 and the drain of the fet Mp3 serves as the output terminal of the voltage regulating circuit 100 to provide the voltage Vreg. In addition, the voltage regulating circuit 100 further includes a zener diode ZD connected between the output terminal of the voltage regulating circuit 100 and the signal ground.
The voltage regulating circuit 100 adopts the operational amplifier 110 and works in a negative feedback loop, so that Vref = VFB, the reference voltage Vref is provided by a bandgap reference source, VFB is an output feedback voltage, and Vreg is an output voltage of the voltage regulating circuit 100, and is used for supplying power to the internal circuit of the chip, and according to the relationship, the following steps can be obtained: verg = Vref (R11 + R12)/R12. The circuit has a simple structure and high precision, but the band-gap reference source and the voltage regulating circuit need certain establishing time after the chip is electrified, and the time is equivalent to that no voltage source exists in the chip, so that the situation of transient indication errors during the chip electrification is easily caused.
Disclosure of Invention
In order to solve the technical problem, the invention provides a voltage regulating circuit which can improve the circuit response speed when a chip is powered on and ensure high precision of the circuit.
According to the present invention, there is provided a voltage regulating circuit for supplying power to a chip internal circuit, comprising:
the error amplifier is connected between the power supply end and the ground, is provided with a first output end and a second output end, and is used for providing a first control signal through the first output end or providing a second control signal through the second output end according to the comparison result of the reference voltage and the feedback voltage;
a first transistor connected between a power supply terminal and an output terminal of the voltage regulator circuit, a control terminal of the first transistor being connected to a first output terminal of the error amplifier;
a second transistor connected in parallel to both ends of the first transistor, a control end of the second transistor being connected to a second output end of the error amplifier;
and the feedback control module is connected between the output end of the voltage regulating circuit and the ground and is used for providing the feedback voltage.
Preferably, the aforementioned error amplifier can be switched between:
a start-up mode in which the reference voltage does not reach a predetermined voltage reference value, and the error amplifier controls the second transistor to be in a conduction state according to the generated second control signal;
and an operation mode in which the reference voltage reaches the predetermined voltage reference value, and the error amplifier controls the first transistor to be in an on state and controls the second transistor to be in an off state according to the generated first control signal.
Preferably, the error amplifier includes:
the first end of the third transistor is connected with the power supply end, the control end of the third transistor is connected with the second end of the third transistor, the control end of the fourth transistor is used as the inverting input end of the error amplifier and connected with the feedback control module, and the feedback voltage is accessed;
a fifth transistor and a sixth transistor connected in series between a power supply terminal and the first current source, a first terminal of the fifth transistor being connected to a first terminal of the third transistor, a control terminal of the fifth transistor being connected to a control terminal of the third transistor, a connection node of the fifth transistor and the sixth transistor serving as a first output terminal of the error amplifier, and a control terminal of the sixth transistor serving as a non-inverting input terminal of the error amplifier and receiving the reference voltage;
and a seventh transistor and a first resistor connected in series between a power supply terminal and a ground, wherein a first terminal of the seventh transistor is connected to a first terminal of the third transistor, a control terminal of the seventh transistor is connected to a control terminal of the third transistor, a second terminal of the seventh transistor is connected to one terminal of the first resistor, and a connection node of the seventh transistor and the first resistor serves as a second output terminal of the error amplifier.
Preferably, the voltage regulating circuit further comprises:
and the output end of the band-gap reference voltage generator is connected with the control end of the fourth transistor and used for providing the reference voltage, and the preset voltage reference value is greater than or equal to the breakover voltage of the fourth transistor.
Preferably, the feedback control module comprises:
and the connection node of the second resistor and the third resistor is connected with the control end of the second transistor and used for providing the feedback voltage.
Preferably, the voltage regulating circuit further comprises:
and the voltage stabilizing device is connected between the output end of the voltage regulating circuit and the ground.
Preferably, the voltage regulator device is any one selected from a capacitor and a diode.
Preferably, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all metal oxide semiconductor field effect transistors.
Preferably, the first transistor, the third transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all P-type metal oxide semiconductor field effect transistors.
Preferably, the second transistor and the fourth transistor are both N-type metal oxide semiconductor field effect transistors.
The beneficial effects of the invention are: the invention provides a voltage regulating circuit for supplying power to a chip internal circuit, which comprises: an error amplifier connected between the supply terminal and ground, the error amplifier having a first output terminal and a second output terminal for providing a first control signal via the first output terminal or a second control signal via the second output terminal based on a comparison of a reference voltage and a feedback voltage; the first transistor is connected between the power supply end and the output end of the voltage regulating circuit, and the control end of the first transistor is connected with the first output end of the error amplifier; the second transistor is connected in parallel with two ends of the first transistor, and the control end of the second transistor is connected with the second output end of the error amplifier; and a feedback control module connected between the output terminal of the voltage regulating circuit and ground for providing the feedback voltage, so that when the reference voltage does not reach a predetermined voltage reference value, the error amplifier is in a start-up mode, and the second transistor is controlled to be in a conducting state according to the generated second control signal; when the reference voltage reaches the preset voltage reference value, the error amplifier is in a stable working mode, the first transistor is controlled to be in a conducting state and the second transistor is controlled to be in a cut-off state according to the generated first control signal, so that the voltage regulating circuit can quickly respond to the power-on of the chip, can provide voltage for the internal circuit of the chip in time before the reference voltage is not established along with the rise of the input signal (Vin), and can stabilize the output on a set value to obtain a high-precision output voltage (Vreg) after the reference voltage is stably established.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a voltage regulation circuit of the prior art;
fig. 2 is a schematic diagram illustrating a voltage regulation circuit according to an embodiment of the present invention;
FIG. 3 illustrates timing diagrams of the operation of various voltage signals in the voltage regulating circuit of FIG. 2;
FIG. 4 is an equivalent circuit diagram of the error amplifier in the start-up mode of the voltage regulation circuit of FIG. 2;
fig. 5 is an equivalent circuit diagram of the error amplifier in the voltage regulating circuit of fig. 2 in an operating mode.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 2 is a schematic structural diagram of a voltage regulating circuit according to an embodiment of the present invention.
Referring to fig. 2, a voltage regulating circuit 200 for supplying power to a circuit inside a chip according to an embodiment of the present invention may be used as a voltage regulator device of an electronic device. The electronic device may be a tablet, smartphone, smartwatch, or any suitable device, and may be powered by a battery (not shown) in some applications.
In this embodiment, the voltage regulating circuit 200 includes, but is not limited to: an error amplifier 210, a transistor Q6, a transistor Q7, and a feedback control module 220.
The error amplifier 210 is connected between the power supply terminal and the ground, and has a first output terminal and a second output terminal, and is configured to provide a first control signal Vout0 through the first output terminal or provide a second control signal Vout1 through the second output terminal according to a comparison result between the reference voltage Vref and the feedback voltage VFB; a transistor Q6 is connected between the power supply terminal and the output terminal of the voltage regulating circuit 200, a control terminal of the transistor Q6 is connected to the first output terminal of the error amplifier 210, a transistor Q7 is connected in parallel to two terminals of the transistor Q6, and a control terminal of the transistor Q7 is connected to the second output terminal of the error amplifier 210; the feedback control module 220 is connected between the output terminal of the voltage regulating circuit 200 and ground for providing the aforementioned feedback voltage VFB.
Further, the error amplifier 210 may be switched between:
a start-up mode, in which the reference voltage Vref does not reach a predetermined voltage reference value, and the error amplifier 210 controls the transistor Q7 to be in a conducting state according to the generated second control signal Vout1;
in the operation mode, the reference voltage Vref reaches the predetermined voltage reference value, and the error amplifier 210 controls the transistor Q6 to be in the on state and controls the transistor Q7 to be in the off state according to the generated first control signal Vout 0.
Further, error amplifier 210 may include a differential input stage having a differential input pair coupled to receive reference voltage Vref and feedback voltage VFB, and having a first tail, which may include current source I1. In this embodiment, the differential input stage comprises:
a transistor Q1, a transistor Q3 and the aforementioned current source I1 connected in series between the power supply terminal and the ground, wherein a first terminal of the transistor Q1 is connected to the power supply terminal for receiving the input signal Vin, a control terminal is connected to a second terminal of the transistor Q3, and the control terminal of the transistor Q3 is connected to the feedback control module 220 as an inverting input terminal of the error amplifier 210 and is connected to the feedback voltage VFB;
a transistor Q2 and a transistor Q4 connected in series between the power supply terminal and the current source I1, wherein a first terminal of the transistor Q2 is connected to the first terminal of the transistor Q1, a control terminal is connected to the control terminal of the transistor Q1, a second terminal of the transistor Q2 is connected to the second terminal of the transistor Q4, a connection node of the transistor Q2 and the transistor Q4 serves as a first output terminal of the error amplifier 210, the control terminal of the transistor Q4 serves as a non-inverting input terminal of the error amplifier 210 and is connected to a reference voltage Vref, and the first terminal is connected to the ground through the current source I1;
a transistor Q5 and a resistor R23 connected in series between the power supply terminal and the ground, wherein a first terminal of the transistor Q5 is connected to the first terminal of the transistor Q1, a control terminal is connected to the control terminal of the transistor Q1, a second terminal is connected to one terminal of the resistor R23, the other terminal of the resistor R23 is grounded, and a connection node of the transistor Q5 and the resistor R23 serves as a second output terminal of the error amplifier 210.
Further, the voltage regulating circuit 200 further includes a bandgap reference voltage generator (not shown), an output terminal of the bandgap reference voltage generator is connected to the control terminal of the transistor Q3 for providing the reference voltage Vref, and the predetermined voltage reference value is greater than or equal to the turn-on voltage value of the transistor Q4.
In this embodiment, the feedback control module 220 includes: the resistor R21 and the resistor R22, specifically, the resistor R21 and the resistor R22 are connected in series between the output terminal of the voltage regulating circuit 200 and the ground, and the connection node of the resistor R21 and the resistor R22 is connected to the control terminal of the transistor Q7 for providing the feedback voltage VFB.
Further, the voltage regulating circuit 200 further includes a voltage stabilizing device connected between the output terminal of the voltage regulating circuit 200 and ground.
Further, the voltage regulator device is any one selected from a capacitor and a diode, and in the present embodiment, the voltage regulator device is, for example, a voltage regulator diode ZD, as shown in fig. 2.
In this embodiment, the transistors Q6, Q7, Q1, Q3, Q2, Q4, and Q5 are all Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), which are abbreviated as MOS transistors.
Specifically, the transistor Q6, the transistor Q1, the transistor Q2, the transistor Q4, and the transistor Q5 are P-type MOS transistors, and the transistor Q7 and the transistor Q3 are N-type MOS transistors.
Fig. 3 is a timing diagram showing operation of respective voltage signals in the voltage regulating circuit shown in fig. 2, fig. 4 is an equivalent circuit diagram showing the error amplifier in the voltage regulating circuit shown in fig. 2 in a start-up mode, and fig. 5 is an equivalent circuit diagram showing the error amplifier in the voltage regulating circuit shown in fig. 2 in an operation mode.
Referring to fig. 3 to fig. 5, the operation principle of the voltage regulating circuit 200 according to the embodiment of the present invention will be further described.
As shown in fig. 3, at time t1, the chip starts to power up, the reference voltage Vref (as a fixed regulated voltage value output from the bandgap reference voltage generator) is not yet stabilized due to the switching delay of the transistors in the bandgap reference voltage generator, and is not immediately available, that is, the reference voltage value does not reach the predetermined reference voltage value (the predetermined voltage reference value is greater than or equal to the on voltage value of the transistor Q4), so the transistor Q4 is in the off state, the first control signal Vout0 at this time is equal to the input signal Vin, the on voltage of the transistor Q6 is not reached, the transistor Q6 is in the off state, the output voltage Vreg of the voltage regulating circuit 200 is in the low level state, the error amplifier 210 in the voltage regulating circuit 200 operates in the start-up mode, the circuit structure thereof is simplified to obtain the circuit shown in fig. 4, and the second control signal Vout1 is connected to the ground through the circuit R21.
When the level of the input signal Vin gradually rises as the chip starts to be powered on and reaches the turn-on voltage of the transistor Q7, the transistor Q7 is turned on, and the output voltage Vreg of the voltage regulating circuit 200 is pulled to the potential of the input signal Vin by the transistor Q7.
As the input signal Vin continues to rise, the feedback voltage VFB also increases with the increase of the output voltage Vreg, when the feedback voltage VFB reaches the on voltage of the transistor Q2 (assuming that w is Vth), the transistor Q2 is turned on, and at this time, the voltage regulating circuit 200 forms a negative feedback closed loop circuit including the transistor Q6, and according to the circuit connection relationship at this time, the following steps are obtained:
VFB＝Vth (1)
Vreg＝Vth*(R21+R22)/R22 (2)
when the reference voltage Vref is established at time t2, that is, when the reference voltage Vref reaches a predetermined reference voltage value (the predetermined voltage reference value is greater than or equal to the on-state voltage value of the transistor Q4), at this time, the transistor Q4 is in an on state, the first control signal Vout0 is pulled to be equal to the value of the input signal Vin, the transistor Q6 is turned on, by reasonably setting the resistance value of the resistor R23 and the current mirror ratio of the transistor Q1 and the transistor Q5, the level of the second control signal Vout1 can be raised to be approximately equal to the input signal Vin, so that the transistor Q7 is turned off, at this time, the error amplifier 210 in the voltage regulating circuit 200 is in a stable operating mode, the circuit structure is simplified to obtain the circuit shown in fig. 5, so that the voltage regulating circuit 200 forms a negative feedback closed loop circuit including the transistor Q6, so that:
VFB＝Vref (3)
Vreg＝Vref*(R21+R22)/R22 (4)
thus, when the chip is powered on, the voltage regulating circuit 200 responds quickly before the reference voltage Vref is not established, and follows the rising of the input signal Vin, so as to provide voltage for the internal circuit of the chip in time, and after the reference voltage Vref is established, the voltage regulating circuit 200 can stably output the value set by the formula (4), thereby obtaining the high-precision output voltage Vreg.
In summary, the voltage regulator circuit 200 for providing an output voltage Vreg to the chip according to the embodiment of the present invention includes: an error amplifier 210 connected between the power supply terminal and ground, the error amplifier 210 having a first output terminal and a second output terminal for providing a first control signal Vout0 through the first output terminal or a second control signal Vout1 through the second output terminal according to a comparison result of the reference voltage Vref and the feedback voltage VFB; a transistor Q6 connected between the power supply terminal and the output terminal of the voltage regulating circuit 200, wherein a control terminal of the transistor Q6 is connected to the first output terminal of the error amplifier 210; a transistor Q7 connected in parallel to both ends of the transistor Q6, wherein a control end of the transistor Q7 is connected to the second output end of the error amplifier 210; and a feedback control module 220 connected between the output terminal of the voltage regulating circuit 200 and ground for providing a feedback voltage VFB, so that when the reference voltage Vref does not reach a predetermined voltage reference value, the error amplifier 210 is in a start-up mode, and controls the transistor Q7 to be in a conducting state according to the generated second control signal Vout1; when the reference voltage Vref reaches a predetermined voltage reference value, the error amplifier 210 is in a stable operating mode, the transistor Q6 is controlled to be in a conducting state and the transistor Q7 is controlled to be in a blocking state at the same time according to the generated first control signal Vout0, so that the voltage regulating circuit 200 can quickly respond to the power-on of the chip, can provide the output voltage Vreg to the internal circuit of the chip in time before the reference voltage Vref is not established along with the rise of the input signal Vin, and can stabilize the output on a set value by the voltage regulating circuit 200 after the reference voltage Vref is stably established to obtain the output voltage Vreg with higher precision, thereby improving the response speed of the voltage regulating circuit 200 when the chip is powered on one hand, and ensuring the high precision of the voltage regulating circuit 200 on the other hand, and avoiding the situation that the internal circuit of the chip has a short indication error in the period of time due to the non-establishment of the reference voltage at the initial stage of the power-on of the chip.
It should be noted that in the description of the present invention, it should be understood that the terms "upper", "lower", "inner", etc. indicate orientation or positional relationship only for convenience in describing the present invention and simplifying description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Further, in this document, the contained terms "include", "contain" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (9)
1. A voltage regulation circuit for powering on-chip circuitry, wherein the voltage regulation circuit comprises:
the error amplifier is connected between the power supply end and the ground, is provided with a first output end and a second output end, and is used for providing a first control signal through the first output end or providing a second control signal through the second output end according to the comparison result of the reference voltage and the feedback voltage;
a first transistor connected between a power supply terminal and an output terminal of the voltage regulating circuit, a control terminal of the first transistor being connected to a first output terminal of the error amplifier;
the second transistor is connected in parallel with two ends of the first transistor, and the control end of the second transistor is connected with the second output end of the error amplifier;
a feedback control module connected between the output terminal of the voltage regulating circuit and ground for providing the feedback voltage,
wherein the error amplifier includes:
the first end of the third transistor is connected with the power supply end, the control end of the third transistor is connected with the second end of the third transistor, the control end of the fourth transistor is used as the inverting input end of the error amplifier and connected with the feedback control module, and the feedback voltage is accessed;
a fifth transistor and a sixth transistor connected in series between a power supply terminal and the first current source, a first terminal of the fifth transistor being connected to the first terminal of the third transistor, a control terminal of the fifth transistor being connected to the control terminal of the third transistor, a connection node of the fifth transistor and the sixth transistor serving as a first output terminal of the error amplifier, and a control terminal of the sixth transistor serving as a non-inverting input terminal of the error amplifier to which the reference voltage is applied;
and the first end of the seventh transistor is connected with the first end of the third transistor, the control end of the seventh transistor is connected with the control end of the third transistor, the second end of the seventh transistor is connected with one end of the first resistor, and the connection node of the seventh transistor and the first resistor is used as the second output end of the error amplifier.
2. The voltage regulation circuit of claim 1, wherein the error amplifier is switchable between:
a start-up mode in which the reference voltage does not reach a predetermined voltage reference value, and the error amplifier controls the second transistor to be in a conduction state according to the generated second control signal;
and in the working mode, the reference voltage reaches the preset voltage reference value, and the error amplifier controls the first transistor to be in a conducting state and controls the second transistor to be in a stopping state at the same time according to the generated first control signal.
3. The voltage regulation circuit of claim 2, wherein the voltage regulation circuit further comprises:
and the output end of the band-gap reference voltage generator is connected with the control end of the fourth transistor and used for providing the reference voltage, and the preset voltage reference value is greater than or equal to the conduction voltage of the fourth transistor.
4. The voltage regulation circuit of claim 3, wherein the feedback control module comprises:
and the second resistor and the third resistor are connected between the output end of the voltage regulating circuit and the ground in series, and the connecting node of the second resistor and the third resistor is connected with the control end of the second transistor so as to provide the feedback voltage.
5. The voltage regulation circuit of claim 4, wherein the voltage regulation circuit further comprises:
and the voltage stabilizing device is connected between the output end of the voltage regulating circuit and the ground.
6. The voltage regulating circuit according to claim 5, wherein the voltage stabilizing device is any one selected from a capacitor and a diode.
7. The voltage regulating circuit of claim 2, wherein the first, second, third, fourth, fifth, sixth, and seventh transistors are all metal oxide semiconductor field effect transistors.
8. The voltage regulation circuit of claim 7 wherein the first, third, fifth, sixth, and seventh transistors are all P-type metal oxide semiconductor field effect transistors.
9. The voltage regulation circuit of claim 8, wherein the second and fourth transistors are both N-type metal oxide semiconductor field effect transistors.
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| TWI825698B (en) * | 2022-04-29 | 2023-12-11 | 瑞昱半導體股份有限公司 | Voltage regulator and signal amplifying circuit |
| CN115328244B (en) * | 2022-08-04 | 2023-11-07 | 骏盈半导体(上海)有限公司 | Clamping circuit on operational amplifier |
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