CN116880656B - JFET high-voltage stabilizing circuit with constant current feedback - Google Patents
JFET high-voltage stabilizing circuit with constant current feedback Download PDFInfo
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- CN116880656B CN116880656B CN202310920157.5A CN202310920157A CN116880656B CN 116880656 B CN116880656 B CN 116880656B CN 202310920157 A CN202310920157 A CN 202310920157A CN 116880656 B CN116880656 B CN 116880656B
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- 238000000034 method Methods 0.000 description 13
- 238000002955 isolation Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
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Abstract
The application provides a JFET high voltage stabilizing circuit of area constant current feedback, its characterized in that, the circuit includes: the high-voltage JFET comprises a high-voltage JFET tube, an input mismatch operational amplifier, a voltage dividing resistor string and a Wilson current mirror, wherein the drain electrode of the high-voltage JFET tube is connected with a high-voltage input end, the source stage of the high-voltage JFET tube is used as an output end, the source stage of the high-voltage JFET tube is connected with a first end of the voltage dividing resistor string, and the grid electrode of the high-voltage JFET tube is connected with the input end of the input mismatch operational amplifier; the second end of the voltage dividing resistor string is connected with the first end of the Wilson current mirror, the voltage dividing resistor string is connected with the output end of the input mismatch operational amplifier, and the second end of the Wilson current mirror is grounded.
Description
Technical Field
The invention relates to the field of integrated circuits, in particular to a JEFT high-voltage stabilizing circuit with constant current feedback.
Background
In a power management integrated circuit, an upper power supply is usually a high-voltage power supply, and a logic control circuit and a reference part for processing signals internally are composed of low-voltage devices, so that the devices are ensured to work in a safe working area, and stable low-voltage power supply is required to be provided for the devices. In the power management circuit, a high voltage Junction Field-Effect Transistor (JFET) is generally used as a high voltage withstand and power supply device, and then a zener diode clamps a Gate (Gate) end of a medium voltage tube output by the JFET, and the medium voltage tube is an isolation tube to provide power for a low voltage part and serve as high voltage isolation to obtain a stable low voltage power supply.
In the existing mode, a high-voltage JFET is generally adopted as a high-voltage withstand voltage and power supply device, then a clamping is carried out on the Gate end of a medium-voltage tube output by the high-voltage withstand voltage and power supply device through a zener tube, the medium-voltage tube is an isolation tube, and a power supply is provided for a low-voltage part and is used as high-voltage isolation at the same time, so that a stable low-voltage power supply is obtained. This approach requires the use of non-conventional device zener diodes, which adds cost to the chip process, and the zener voltage is stabilized by the zener breakdown characteristics of the device itself, without feedback in the system, and the output voltage is shifted as the process drifts.
Disclosure of Invention
The invention provides a JFET high-voltage stabilizing circuit with constant current feedback, in particular to a high-voltage power supply and a high-voltage starting part of a power management chip.
In view of this, the first aspect of the present application provides a JFET high voltage stabilizing circuit with constant current feedback, characterized in that the circuit comprises: the high-voltage JFET comprises a high-voltage JFET tube, an input mismatch operational amplifier, a voltage dividing resistor string and a Wilson current mirror, wherein the drain electrode of the high-voltage JFET tube is connected with a high-voltage input end, the source stage of the high-voltage JFET tube is used as an output end, the source stage of the high-voltage JFET tube is connected with a first end of the voltage dividing resistor string, and the grid electrode of the high-voltage JFET tube is connected with the input end of the input mismatch operational amplifier; the second end of the voltage dividing resistor string is connected with the first end of the Wilson current mirror, the voltage dividing resistor string is connected with the output end of the input mismatch operational amplifier, and the second end of the Wilson current mirror is grounded.
Optionally, with reference to the first aspect, in a possible implementation manner, the voltage dividing resistor string includes a resistor R1, a resistor R2, and a resistor R3 connected in series; the first end of the resistor R1 is the first end of the voltage dividing resistor string, the second end of the resistor string is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the first end of the resistor R3, and the second end of the resistor R3 is the second end of the voltage dividing resistor string; and a first end of the resistor R2 is connected with a negative output end of the input mismatch operational amplifier, and a second end of the resistor R3 is connected with a positive output end of the input mismatch operational amplifier.
Optionally, with reference to the first aspect, in a possible implementation manner, the wilson current mirror includes: triode Q0, triode Q1, resistance R0, triode Q0's base with triode Q1's base links to each other, triode Q0's projecting pole links to each other with resistance R0's first end, triode Q1's projecting pole links to each other with resistance R0's second end, just triode Q1's projecting pole ground.
Optionally, with reference to the first aspect, in a possible implementation manner, a collector of the transistor Q0 is connected to an input mismatch op-amp, a base of the transistor Q0 is connected to the second end of the voltage dividing resistor string, and a collector of the transistor Q1 is connected to the second end of the voltage dividing resistor string.
Optionally, with reference to the first aspect, in a possible implementation manner, the wilson current mirror includes: MOS pipe Q2, MOS pipe Q3, resistance R4, MOS pipe Q2's grid with MOS pipe Q3's grid links to each other, MOS pipe Q2's source is connected with resistance R4's first end, MOS pipe Q3's source links to each other with resistance R4's second end, just MOS pipe Q4's source ground.
Optionally, with reference to the first aspect, in one possible implementation manner, a drain of the MOS transistor Q2 is connected to the mismatch op-amp, a gate of the MOS transistor Q2 is connected to a second end of the voltage dividing resistor string, and a drain of the MOS transistor Q3 is connected to the second end of the voltage dividing resistor string.
Optionally, with reference to the first aspect, in one possible implementation manner, the high-voltage JFET tube has a low-voltage conducting characteristic, and provides an operating voltage for a circuit, the operating points of the input mismatch op-amp and the voltage dividing resistor string start to operate normally along with the voltage rise, the input mismatch op-amp starts to collect a voltage difference of an input end and feeds back the voltage difference to a gate end of the high-voltage JFET tube to adjust the operating point of the high-voltage JFET, so as to adjust an output voltage VDDL of an output end, and the output voltage VDDL is fed back to the input mismatch op-amp through a voltage dividing value of the voltage dividing resistor string, so as to maintain voltage stability of the JFET high-voltage stabilizing circuit with constant current feedback.
Optionally, with reference to the first aspect, in a possible implementation manner, when the output voltage VDDL is smaller than a preset value, that is, the voltage division of the resistor R2 is low, the input mismatch op-amp output is inverted to be positive, so as to increase the output voltage VDDL of the high-voltage JFET tube, so that the output voltage VDDL returns to the preset value.
Optionally, with reference to the first aspect, in a possible implementation manner, when the output voltage VDDL is greater than a preset value, that is, the voltage division of the resistor R2 is greater, the input mismatch op-amp output is negative, so as to reduce the output voltage VDDL of the high-voltage JFET tube, so that the output voltage VDDL returns to the preset value.
The utility model provides a take JFET high voltage stabilizing circuit of constant current feedback utilizes the low pressure conduction characteristic of high voltage JFET pipe itself at the start-up stage, for the circuit provides coarse operating voltage, the operating point of input mismatch fortune is put and bleeder resistor cluster is established along with the voltage rising, the input mismatch fortune begins to gather the voltage difference of input to the Gate end adjustment high voltage JFET pipe of feedback to JFET, thereby adjusted the voltage VDDL of output, output voltage VDDL feeds back to the input mismatch fortune through bleeder resistor cluster bleeder value again, thereby maintain the stability of system. In the circuit, the feedback system can enable the input end of the input mismatch operational amplifier to obtain a stable voltage difference, the current of the branch is the input mismatch operational amplifier input difference Vos/R2, so that relatively stable branch current is obtained, the branch current provides stable Vbe bias for the triode, stable bias current is obtained through the Wilson current mirror, and stable working current is provided for the input mismatch operational amplifier.
Drawings
Fig. 1 is a schematic structural diagram of a JFET high-voltage stabilizing circuit with constant current feedback in an embodiment of the present application;
FIG. 2 is a schematic diagram of a two-way auto-traceable intermediate input mismatch op-amp of a trimming integrated circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a JFET high-voltage stabilizing circuit with constant current feedback in the embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The term "and/or" appearing in the present application may be an association relationship describing an associated object, meaning that there may be three relationships, for example, a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules that are expressly listed or inherent to such process, method, article, or apparatus.
In a power management integrated circuit, an upper power supply is usually a high-voltage power supply, and a logic control circuit and a reference part for processing signals internally are composed of low-voltage devices, so that the devices are ensured to work in a safe working area, and stable low-voltage power supply is required to be provided for the devices. In the power management circuit, a high voltage Junction Field-Effect Transistor (JFET) is generally used as a high voltage withstand and power supply device, and then a zener diode clamps a Gate (Gate) end of a medium voltage tube output by the JFET, and the medium voltage tube is an isolation tube to provide power for a low voltage part and serve as high voltage isolation to obtain a stable low voltage power supply.
In the existing mode, a high-voltage JFET is generally adopted as a high-voltage withstand voltage and power supply device, then a clamping is carried out on the Gate end of a medium-voltage tube output by the high-voltage withstand voltage and power supply device through a zener tube, the medium-voltage tube is an isolation tube, and a power supply is provided for a low-voltage part and is used as high-voltage isolation at the same time, so that a stable low-voltage power supply is obtained. This approach requires the use of non-conventional device zener diodes, which adds cost to the chip process, and the zener voltage is stabilized by the zener breakdown characteristics of the device itself, without feedback in the system, and the output voltage is shifted as the process drifts.
In order to solve the above problems, the present application provides a JFET high-voltage stabilizing circuit with constant current feedback, in a starting stage, by using the low-voltage conduction characteristic of the high-voltage JFET tube, a rough working voltage is provided for the circuit, the working points of an input mismatch operational amplifier and a voltage dividing resistor string are established along with the voltage rise, the input mismatch operational amplifier starts to collect the voltage difference of an input end, and the voltage difference is fed back to the Gate end of the JFET to adjust the working point of the high-voltage JFET tube, so that the output voltage VDDL is adjusted, and the output voltage VDDL is fed back to the input mismatch operational amplifier through the voltage dividing value of the voltage dividing resistor string, thereby maintaining the stability of the system. In the circuit, the feedback system can enable the input end of the input mismatch operational amplifier to obtain a stable voltage difference, the current of the branch is the input mismatch operational amplifier input difference Vos/R2, so that relatively stable branch current is obtained, the branch current provides stable Vbe bias for the triode, stable bias current is obtained through the Wilson current mirror, and stable working current is provided for the input mismatch operational amplifier.
Referring to fig. 1, a circuit structure provided in the present application may include:
a high-voltage JFET tube, an input mismatch operational amplifier, a voltage dividing resistor string and a Wilson current mirror,
the drain electrode of the high-voltage JFET tube is connected with a high-voltage input end, the source electrode of the high-voltage JFET tube is used as an output end, the source electrode of the high-voltage JFET tube is connected with a first end of a voltage dividing resistor string, and the grid electrode of the high-voltage JFET tube is connected with the input end of the input mismatch operational amplifier; the second end of the voltage dividing resistor string is connected with the first end of the Wilson current mirror, the voltage dividing resistor string is connected with the output end of the input mismatch operational amplifier, and the second end of the Wilson current mirror is grounded.
With continued reference to fig. 1, the voltage dividing resistor string includes a resistor R1, a resistor R2, and a resistor R3 connected in series; the first end of the resistor R1 is the first end of the voltage dividing resistor string, the second end of the resistor string is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the first end of the resistor R3, and the second end of the resistor R3 is the second end of the voltage dividing resistor string; and a first end of the resistor R2 is connected with a negative output end of the input mismatch operational amplifier, and a second end of the resistor R3 is connected with a positive output end of the input mismatch operational amplifier.
The wilson current mirror includes: triode Q0, triode Q1, resistance R0, triode Q0's base with triode Q1's base links to each other, triode Q0's projecting pole links to each other with resistance R0's first end, triode Q1's projecting pole links to each other with resistance R0's second end, just triode Q1's projecting pole ground.
The collector of the triode Q0 is connected with the input mismatch operational amplifier, the base of the triode Q0 is connected with the second end of the voltage dividing resistor string, and the collector of the triode Q1 is connected with the second end of the voltage dividing resistor string.
It should be noted that, the specific circuit structure of the input mismatch op-amp described in fig. 1 may be understood with reference to fig. 2, and will not be described herein.
In one implementation, the wilson current mirror may be referred to in fig. 1 and is composed of a transistor Q0, a transistor Q1, and a resistor R0. In another implementation, the wilson current mirror may be composed of a MOS transistor Q2, a MOS transistor Q3, and a resistor R4. Please refer to fig. 3 in detail. It can be understood that the JFET high voltage regulator circuit with constant current feedback shown in fig. 3 is different from the JFET high voltage regulator circuit with constant current feedback shown in fig. 1 only in the wilson current mirror portion, and the rest portions are the same.
Specifically, referring to fig. 3, the wilson current mirror includes:
MOS pipe Q2, MOS pipe Q3, resistance R4, MOS pipe Q2's grid with MOS pipe Q3's grid links to each other, MOS pipe Q2's source is connected with resistance R4's first end, MOS pipe Q3's source links to each other with resistance R4's second end, just MOS pipe Q4's source ground.
The drain electrode of the MOS tube Q2 is connected with the mismatched operational amplifier, the grid electrode of the MOS tube Q2 is connected with the second end of the voltage dividing resistor string, and the drain electrode of the MOS tube Q3 is connected with the second end of the voltage dividing resistor string.
In the above two implementation manners, the high-voltage JFET tube has a low-voltage conduction characteristic, and provides a working voltage for a circuit, the working points of the input mismatch op-amp and the voltage dividing resistor string start to work normally along with the voltage rise, the input mismatch op-amp starts to collect the voltage difference of the input end and feeds back to the gate end of the high-voltage JFET tube to adjust the working point of the high-voltage JFET, so that the output voltage VDDL of the output end is adjusted, and the output voltage VDDL is fed back to the input mismatch op-amp through the voltage dividing value of the voltage dividing resistor string to maintain the voltage stability of the high-voltage stabilizing circuit with the constant current feedback.
When the output voltage VDDL is smaller than a preset value, that is, the voltage division of the resistor R2 is low, the output of the input mismatch op-amp is reversed to be positive, so as to increase the output voltage VDDL of the high-voltage JFET tube, so that the output voltage VDDL returns to the preset value. Here, a single-ended output operational amplifier is used, and the voltage division of the resistor R2 is low, that is, the input inverting terminal of the input mismatch operational amplifier is low, and the output is positive.
When the output voltage VDDL is greater than a preset value, that is, the voltage division of the resistor R2 is larger, the output direction of the input mismatch op-amp is negative, so as to reduce the output voltage VDDL of the high-voltage JFET tube, so that the output voltage VDDL returns to the preset value. Here, a single-ended output operational amplifier is used, and the voltage division of the resistor R2 is larger, that is, the input reverse end of the input mismatch operational amplifier is higher, and the output is negative.
The utility model provides a take JFET high voltage stabilizing circuit of constant current feedback utilizes the low pressure conduction characteristic of high voltage JFET pipe itself at the start-up stage, for the circuit provides coarse operating voltage, the operating point of input mismatch fortune is put and bleeder resistor cluster is established along with the voltage rising, the input mismatch fortune begins to gather the voltage difference of input to the Gate end adjustment high voltage JFET pipe of feedback to JFET, thereby adjusted the voltage VDDL of output, output voltage VDDL feeds back to the input mismatch fortune through bleeder resistor cluster bleeder value again, thereby maintain the stability of system. In the circuit, the feedback system can enable the input end of the input mismatch operational amplifier to obtain a stable voltage difference, the current of the branch is the input mismatch operational amplifier input difference Vos/R2, so that relatively stable branch current is obtained, the branch current provides stable Vbe bias for the triode, stable bias current is obtained through the Wilson current mirror, and stable working current is provided for the input mismatch operational amplifier.
The invention is applied to an integrated circuit, for a system needing external high-voltage power supply, the system can directly obtain stable low-voltage power supply without using a Zener diode, the feedback system also does not need to start a circuit, the obtained low-voltage power supply is stable and reliable, and the stable low-voltage power supply can provide stable output power supply under the conditions of light load and heavy load at any time through the adjustment of the feedback system. The system is characterized in that an extra LDO is not needed to generate a low-voltage power supply for the system, and a JFET high-voltage stabilizing circuit with constant current feedback can obtain a stabilized voltage power supply with stabilized feedback without using a Zener.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the embodiments provided herein, it should be understood that the disclosed methods may be implemented in other ways without exceeding the spirit and scope of the present application. The present embodiments are merely illustrative examples and should not be considered limiting, as the specific disclosure given should not be limiting for the purposes of this application. For example, some features may be omitted, or not performed.
The technical means disclosed in the present application are not limited to the technical means disclosed in the above embodiments, but also include technical means composed of any combination of the above technical features. It should be noted that modifications and adaptations to the principles of the present application may occur to one skilled in the art and are intended to be comprehended within the scope of the present application.
The foregoing describes in detail a JEFT high voltage regulator circuit with constant current feedback provided in the embodiments of the present application, and specific examples are applied herein to illustrate the principles and embodiments of the present application, where the foregoing description of the embodiments is only for helping to understand the methods and core ideas of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (4)
1. A JFET high voltage regulator circuit with constant current feedback, the circuit comprising:
a high-voltage JFET tube, an input mismatch operational amplifier, a voltage dividing resistor string and a Wilson current mirror,
the drain electrode of the high-voltage JFET tube is connected with a high-voltage input end, the source electrode of the high-voltage JFET tube is used as an output end, the source electrode of the high-voltage JFET tube is connected with a first end of a voltage dividing resistor string, and the grid electrode of the high-voltage JFET tube is connected with the output end of the input mismatch operational amplifier;
the second end of the voltage dividing resistor string is connected with the first end of the Wilson current mirror, the voltage dividing resistor string is connected with the input end of the input mismatch operational amplifier, and the second end of the Wilson current mirror is grounded; the voltage dividing resistor string comprises a resistor R1, a resistor R2 and a resistor R3 which are connected in series;
the first end of the resistor R1 is the first end of the voltage dividing resistor string, the second end of the resistor R1 is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the first end of the resistor R3, and the second end of the resistor R2 is the second end of the voltage dividing resistor string;
the first end of the resistor R2 is connected with the negative input end of the input mismatch operational amplifier, and the second end of the resistor R3 is connected with the positive input end of the input mismatch operational amplifier;
the wilson current mirror includes:
the transistor comprises a transistor Q0, a transistor Q1 and a resistor R0, wherein the base electrode of the transistor Q0 is connected with the base electrode of the transistor Q1, the emitter electrode of the transistor Q0 is connected with the first end of the resistor R0, the emitter electrode of the transistor Q1 is connected with the second end of the resistor R0, and the emitter electrode of the transistor Q1 is grounded;
the collector of the triode Q0 is connected with an input mismatch operational amplifier, the base of the triode Q0 is connected with the second end of the voltage dividing resistor string, and the collector of the triode Q1 is connected with the second end of the voltage dividing resistor string;
or the wilson current mirror comprises:
the MOS transistor Q2, the MOS transistor Q3 and the resistor R4, wherein the grid electrode of the MOS transistor Q2 is connected with the grid electrode of the MOS transistor Q3, the source electrode of the MOS transistor Q2 is connected with the first end of the resistor R4, the source electrode of the MOS transistor Q3 is connected with the second end of the resistor R4, and the source electrode of the MOS transistor Q3 is grounded;
the drain electrode of the MOS tube Q2 is connected with the input mismatch operational amplifier, the grid electrode of the MOS tube Q2 is connected with the second end of the voltage dividing resistor string, and the drain electrode of the MOS tube Q3 is connected with the second end of the voltage dividing resistor string.
2. The JFET high voltage regulator circuit with constant current feedback of claim 1,
the high-voltage JFET tube has the characteristic of low-voltage conduction, and provides working voltage for a circuit, the working points of the input mismatch operational amplifier and the voltage dividing resistor string start to work normally along with the voltage rise, the input mismatch operational amplifier starts to collect the voltage difference of an input end and feeds back the voltage difference to the grid end of the high-voltage JFET tube so as to adjust the working point of the high-voltage JFET tube, and therefore the output voltage VDDL of an output end is adjusted, and the output voltage VDDL is fed back to the input mismatch operational amplifier through the voltage dividing value of the voltage dividing resistor string so as to maintain the voltage stability of the JFET high-voltage stabilizing circuit with constant current feedback.
3. The JFET high voltage regulator circuit with constant current feedback of claim 2,
when the output voltage VDDL is smaller than a preset value, that is, the voltage division of the resistor R2 is low, the output of the input mismatch op-amp is reversed to be positive, so as to increase the output voltage VDDL of the high-voltage JFET tube, so that the output voltage VDDL returns to the preset value.
4. The JFET high voltage regulator circuit with constant current feedback of claim 2,
when the output voltage VDDL is greater than a preset value, that is, the voltage division of the resistor R2 is larger, the output direction of the input mismatch op-amp is negative, so as to reduce the output voltage VDDL of the high-voltage JFET tube, so that the output voltage VDDL returns to the preset value.
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| CN202310920157.5A CN116880656B (en) | 2023-07-25 | 2023-07-25 | JFET high-voltage stabilizing circuit with constant current feedback |
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| CN202310920157.5A CN116880656B (en) | 2023-07-25 | 2023-07-25 | JFET high-voltage stabilizing circuit with constant current feedback |
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| US20210286394A1 (en) * | 2020-03-14 | 2021-09-16 | Vidatronic, Inc. | Current reference circuit with current mirror devices having dynamic body biasing |
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| US5023543A (en) * | 1989-09-15 | 1991-06-11 | Gennum Corporation | Temperature compensated voltage regulator and reference circuit |
| JP2009199501A (en) * | 2008-02-25 | 2009-09-03 | Seiko Instruments Inc | Voltage regulator |
| CN102262414A (en) * | 2010-05-29 | 2011-11-30 | 比亚迪股份有限公司 | Band-gap reference source generating circuit |
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