CN106094966A - A kind of linear voltage regulator of wideband high PSRR - Google Patents
A kind of linear voltage regulator of wideband high PSRR Download PDFInfo
- Publication number
- CN106094966A CN106094966A CN201610725193.6A CN201610725193A CN106094966A CN 106094966 A CN106094966 A CN 106094966A CN 201610725193 A CN201610725193 A CN 201610725193A CN 106094966 A CN106094966 A CN 106094966A
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- voltage
- voltage regulator
- ripple
- linear voltage
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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
- G05F1/569—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 protection
- G05F1/571—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 protection with overvoltage detector
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Abstract
The invention discloses the linear voltage regulator of a kind of wideband high PSRR, it is characterised in that this linear voltage regulator includes power supply ripple preprocessor and low pressure difference linear voltage regulator LDO；The output of described power supply ripple preprocessor is connected with low-dropout regulator LDO input power；Described power supply ripple preprocessor is for producing the DC voltage VP1 of wideband Ripple Suppression；Described low pressure difference linear voltage regulator LDO is used for producing VD VOUT；Described power-supply ripple preprocessor includes resistor voltage divider circuit, low pass filter and voltage follower；Described resistor voltage divider circuit, low pass filter, voltage follower are sequentially connected；By the voltage buffer level using stable Ripple Suppression voltage VG1 and depletion mode transistor to constitute, reduce the ripple of low pressure difference linear voltage regulator LDO input power.The present invention has wideband height PSRR loading range, system stability is affected little, current efficiency high.
Description
Technical field
The invention belongs to high performance analog IC design technical field, be specifically related to a kind of wideband high PSRR
Linear voltage regulator.
Background technology
Low pressure difference linear voltage regulator (LDO), owing to having that circuit structure is simple, transient response speed fast, low cost etc. excellent
Point is used widely.The DC high voltage of input can be converted to the low stricture of vagina needed for electronic equipment by low pressure difference linear voltage regulator
Ripple, the DC low-voltage of low noise.Generally, the input dc power of low pressure difference linear voltage regulator presses, can superposition broadband
AC ripple, equipment and the stability of circuit and circuit performance can be affected.When needs high-performance power supply, nonideal group
Part and parasitic capacitance can change the ideal characterisitics of linear voltage regulator, reduce the inhibitory action to mains fluctuations.Power supply suppresses
Weigh than this index is that manostat suppression is superimposed upon the ability of the AC signal that normal input dc power presses.Power supply suppresses
More maximum than when low frequency, the ability of suppression mains fluctuations is relatively strong, and when high frequency, this ability just reduces.Actual low
The design of pressure reduction linear voltage regulator, its PSRR from 1kHz to 10kHz in the range of begin to decline.
Along with user's raising to the requirement of power supply ripple rejection ability, low noise, high PSRR linear voltage regulator
Require that it still has the good PSRR of 60dB when at 100kHz.When more than 100kHz, PSRR is mainly subject to
Output capacitance, parasitic element and the impact of the upper leakage current of adjustment pipe.
PSRR is the Key Performance Indicator of linear voltage regulator, and PSRR is often depending on the essence of band-gap reference
Degree and the open-loop gain in linear voltage regulator error amplifier loop.Under normal circumstances, linear voltage regulator is higher in order to obtain
PSRR, just use the open-loop gain that bigger error signal is amplified, or increase the coupling electric capacity of outfan, fall
The bandwidth of low linear voltage regulator.Use bigger error to amplify open-loop gain, bigger challenge can be brought to circuit design.And increase
The mode of big outfan coupling electric capacity, can increase again the area of chip, increase production cost.
Summary of the invention
According to above the deficiencies in the prior art, the technical problem to be solved is to propose a kind of wideband height power supply to press down
The linear voltage regulator of ratio processed, has wideband high PSRR characteristic, system stability is affected little, the high spy of current efficiency
Point.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is: the line of a kind of wideband high PSRR
Property manostat, it is characterised in that this linear voltage regulator includes power supply ripple preprocessor and low pressure difference linear voltage regulator LDO；Institute
State the output of power supply ripple preprocessor to be connected with low-dropout regulator LDO input power；Described power supply ripple preprocessor is used for
Produce the DC voltage VP1 of wideband Ripple Suppression；Described low pressure difference linear voltage regulator LDO is used for producing VD
VOUT；Described power-supply ripple preprocessor includes resistor voltage divider circuit, low pass filter and voltage follower；Described electric resistance partial pressure
Circuit, low pass filter, voltage follower are sequentially connected；Described resitstance voltage divider produces one by resistor voltage divider circuit and is less than
Reference voltage V R1 of supply voltage；Described low pass filter, for filtering the power supply disturbance on VR1 and noise, obtains ripple and presses down
Voltage VG1 processed；Described voltage follower is for producing the DC voltage VP1 of Ripple Suppression.Described resistor voltage divider circuit is by dividing
Pressure obtains reference voltage V R1 of slightly below supply voltage.Described resistor voltage divider circuit is series resistance bleeder circuit.
Described voltage follower connects into power supply buffer stage for employing depletion mode transistor M1, depletion mode transistor M1, stricture of vagina
Ripple suppression voltage VG1 delivers to the grid of depletion mode transistor M1, the source electrode at M1 obtain close to Ripple Suppression voltage VG1 with
With voltage VP1.
Described low pressure difference linear voltage regulator LDO includes band-gap reference circuit VBG, error amplifier AMP, adjusts pipe, feedback
Resistor network, output coupling capacitor and bias current adjust circuit I BIAS；Described band-gap reference circuit VBG, bias current adjust
Circuit I BIAS connects with error amplifier AMP respectively.
Described band-gap reference circuit VBG provides reference voltage VREF for low pressure difference linear voltage regulator；Biased electrical is miscarried
Raw circuit I BIAS controls the size of reference current IB；The difference of reference voltage VREF and feedback voltage V FB is through amplifying
After, it is connected to adjust the grid of pipe M2, output voltage VO UT is controlled；Resistance R5 and R6 constitutes feedback network, by dividing potential drop
VFB feeds back to the positive polarity input of error amplifier AMP.
Fluctuate owing to reducing the input power of low pressure difference linear voltage regulator LDO through the DC voltage VP1 of Ripple Suppression,
Obtain the VD VOUT of wideband high PSRR.
The medicine have the advantages that the electricity by using stable Ripple Suppression voltage VG1 and depletion mode transistor to constitute
Pressure buffer stage, it is possible to obtain the DC voltage VP1 of relatively stable wideband Ripple Suppression, reduces low pressure difference linear voltage regulator
The ripple of LDO input power.The output of voltage buffer level inputs as the power supply of low pressure difference linear voltage regulator, finally gives and has
Output voltage VO UT of wideband high PSRR, improves the precision of electrical equipment.The present invention has wideband height PSRR and loads model
Enclose, system stability is affected little, current efficiency high.
Accompanying drawing explanation
Below the content expressed by this specification accompanying drawing and the labelling in figure are briefly described:
Fig. 1 is the linear voltage regulator system construction drawing of the wideband high PSRR of the detailed description of the invention of the present invention.
Fig. 2 is the schematic diagram of the wideband high PSRR linear voltage-stabilizing circuit of the detailed description of the invention of the present invention.
Detailed description of the invention
Below against accompanying drawing, by the description to embodiment, each component that the detailed description of the invention of the present invention is the most involved
Shape, structure, mutual alignment between each several part and annexation, the effect of each several part and operation principle, manufacturing process and
Operate with method etc., be described in further detail, to help those skilled in the art to the inventive concept of the present invention, technology
Scheme has more complete, accurate and deep understanding.
The invention discloses a kind of linear voltage regulator with wideband high PSRR, use the structure of two-stage voltage stabilizing,
Obtain wideband high PSRR characteristic.Its complete circuit is steady by primary power source ripple preprocessor and one-level low pressure difference linearity
Depressor forms.Wherein, power supply ripple preprocessor is composed in series by resistor voltage divider circuit, low pass filter, voltage follower.Logical
Cross resistor voltage divider circuit and produce reference voltage V R1 less than supply voltage, through low pass filter, filter power supply disturbance and
Noise, obtains having relatively high stability Ripple Suppression voltage VG1.The direct current close with VG1 numerical value is obtained by voltage follower
Voltage VP1, VP1 eventually serve as the power supply of low pressure difference linear voltage regulator, and low pressure difference linear voltage regulator is controlled by loop, for
Load provides stable voltage output VOUT, thus realizes wideband Ripple Suppression.Technical scheme sees Fig. 1.
As in figure 2 it is shown, in order to make linear voltage regulator obtain high PSRR, have employed the pretreatment skill of power supply ripple
Art.Wherein, first order power supply ripple preprocessor is made up of resistor voltage divider circuit, low pass filter and voltage follower.Second
Level is a low pressure difference linear voltage regulator LDO.Wherein, low pressure difference linear voltage regulator LDO comprise again band-gap reference circuit (VBG),
Error amplifier (AMP), adjustment pipe, feedback resistive network, output coupling capacitor, bias current adjust circuit (IBIAS) composition.
In first order power supply ripple preprocessor, by the bleeder circuit being made up of resistance R1 and R2 and low pass filter
LPF, it is thus achieved that a relatively stable d. c. voltage signal VG1.The resistor voltage divider circuit using resistance R1 and R2 composition produces one
Individual reference voltage V R1 less than supply voltage, it is also possible to provided this reference voltage V R1 by other kinds of circuit.This benchmark electricity
VR1 is again through low pass filter for pressure, it is achieved filtering of high-frequency noise, obtains stable Ripple Suppression voltage VG1.Ripple Suppression electricity
Pressure VG1 is less than power source supplying voltage, and its magnitude of voltage is determined by the load of mu balanced circuit.Depletion mode transistor M1 connects into
Power supply buffer stage, Ripple Suppression voltage VG1 delivers to the grid of depletion mode transistor M1, and the source electrode at M1 can obtain close to stricture of vagina
The more stable of ripple suppression voltage VG1 follows voltage VP1, and VP1 inputs as the power supply of low-dropout linear voltage-regulating circuit LDO, tool
There is less power supply ripple.
Band-gap reference circuit VBG provides the reference voltage VREF of a 1.2V for low pressure difference linear voltage regulator.Biasing
Current generating circuit IBIAS can control the size of reference current IB, and then controls the static merit of error amplifier AMP work
Consumption.Resistance R3 and R4 constitutes feedback network, and dividing potential drop VFB feeds back to the positive polarity input of error amplifier AMP.Reference
The difference of voltage VREF and feedback voltage V FB, after amplifying, is connected to adjust the grid of pipe M2, carries out output voltage VO UT
Control.Fluctuate owing to reducing the input power of low pressure difference linear voltage regulator LDO through the DC voltage VP1 of Ripple Suppression,
The VD VOUT of wideband high PSRR can be obtained eventually.So that the linear voltage regulator of the present invention is supplied to bear
The output voltage carried has the characteristic of wideband height Ripple Suppression.
Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that the present invention implements not by aforesaid way
Restriction, as long as have employed the method design of the present invention and the improvement of various unsubstantialities that technical scheme is carried out, or without changing
Enter and design and the technical scheme of the present invention are directly applied to other occasion, all within protection scope of the present invention.This
Bright protection domain should be as the criterion with the protection domain that claims are limited.
Claims (8)
1. the linear voltage regulator of a wideband high PSRR, it is characterised in that this linear voltage regulator includes that power supply ripple is pre-
Processor and low pressure difference linear voltage regulator LDO；
The output of described power supply ripple preprocessor is connected with low-dropout regulator LDO input power；
Described power supply ripple preprocessor is for producing the DC voltage VP1 of wideband Ripple Suppression；
Described low pressure difference linear voltage regulator LDO is used for producing VD VOUT.
The linear voltage regulator of wideband high PSRR the most according to claim 1, it is characterised in that described power-supply ripple
Preprocessor includes resistor voltage divider circuit, low pass filter and voltage follower；
Described resistor voltage divider circuit, low pass filter, voltage follower are sequentially connected；
Described resitstance voltage divider produces reference voltage V R1 less than supply voltage by resistor voltage divider circuit；
Described low pass filter, for filtering the power supply disturbance on VR1 and noise, obtains Ripple Suppression voltage VG1；
Described voltage follower is for producing the DC voltage VP1 of Ripple Suppression.
The linear voltage regulator of wideband high PSRR the most according to claim 2, it is characterised in that described electric resistance partial pressure
Circuit obtains reference voltage V R1 of slightly below supply voltage by dividing potential drop.
The linear voltage regulator of wideband high PSRR the most according to claim 3, it is characterised in that described electric resistance partial pressure
Circuit is series resistance bleeder circuit.
The linear voltage regulator of wideband high PSRR the most according to claim 2, it is characterised in that described voltage follow
Device is for using depletion mode transistor M1, depletion mode transistor M1 to connect into power supply buffer stage, and Ripple Suppression voltage VG1 delivers to exhaust
The grid of transistor npn npn M1, the source electrode at M1 obtains following voltage VP1 close to Ripple Suppression voltage VG1.
The linear voltage regulator of wideband high PSRR the most according to claim 1, it is characterised in that described low voltage difference line
Property manostat LDO include band-gap reference circuit VBG, error amplifier AMP, adjust pipe, feedback resistive network, output coupling capacitor
Circuit I BIAS is adjusted with bias current；Described band-gap reference circuit VBG, bias current adjust circuit I BIAS and put with error respectively
Big device AMP connects.
The linear voltage regulator of wideband high PSRR the most according to claim 6, it is characterised in that described band-gap reference
Circuit VBG provides reference voltage VREF for low pressure difference linear voltage regulator；Bias current generating circuit IBIAS controls benchmark electricity
The size of stream IB；The difference of reference voltage VREF and feedback voltage V FB, after amplifying, is connected to adjust the grid of pipe M2
Pole, is controlled output voltage VO UT；Resistance R5 and R6 constitutes feedback network, and dividing potential drop VFB feeds back to error amplifier AMP
Positive polarity input.
The linear voltage regulator of wideband high PSRR the most according to claim 6, it is characterised in that due to through ripple
The DC voltage VP1 of suppression reduces the input power fluctuation of low pressure difference linear voltage regulator LDO, it is thus achieved that wideband high PSRR
VD VOUT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610725193.6A CN106094966B (en) | 2016-08-25 | 2016-08-25 | A kind of linear voltage regulator of wideband high PSRR |
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| CN201610725193.6A CN106094966B (en) | 2016-08-25 | 2016-08-25 | A kind of linear voltage regulator of wideband high PSRR |
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| CN106094966A true CN106094966A (en) | 2016-11-09 |
| CN106094966B CN106094966B (en) | 2019-08-16 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632658A (en) * | 2017-10-30 | 2018-01-26 | 杭州洪芯微电子科技有限公司 | The low pressure difference linear voltage regulator of high PSRR |
| CN108988616A (en) * | 2018-07-31 | 2018-12-11 | 矽力杰半导体技术(杭州)有限公司 | Ripple generative circuit, control circuit and switch converters |
| CN110780187A (en) * | 2019-12-12 | 2020-02-11 | 苏州市运泰利自动化设备有限公司 | Small-size DMM test board card and PCBA test system |
| CN111221373A (en) * | 2020-01-16 | 2020-06-02 | 东南大学 | Low dropout power supply ripple suppression linear voltage regulator |
| CN112152437A (en) * | 2020-11-16 | 2020-12-29 | 深圳市芯天下技术有限公司 | Method and circuit for inhibiting ripples and charge pump |
| CN113064460A (en) * | 2021-03-24 | 2021-07-02 | 成都瓴科微电子有限责任公司 | Low dropout regulator circuit with high power supply rejection ratio |
| TWI811974B (en) * | 2022-01-26 | 2023-08-11 | 大陸商星宸科技股份有限公司 | Low-dropout regulator having bidirectional current adjustment |
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| US8125204B2 (en) * | 2007-01-29 | 2012-02-28 | Richtek Technology Corporation | Two-stage power supply with feedback adjusted power supply rejection ratio |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107632658A (en) * | 2017-10-30 | 2018-01-26 | 杭州洪芯微电子科技有限公司 | The low pressure difference linear voltage regulator of high PSRR |
| CN108988616A (en) * | 2018-07-31 | 2018-12-11 | 矽力杰半导体技术(杭州)有限公司 | Ripple generative circuit, control circuit and switch converters |
| CN108988616B (en) * | 2018-07-31 | 2020-06-02 | 矽力杰半导体技术(杭州)有限公司 | Ripple generation circuit, control circuit and switching converter |
| CN110780187A (en) * | 2019-12-12 | 2020-02-11 | 苏州市运泰利自动化设备有限公司 | Small-size DMM test board card and PCBA test system |
| CN111221373A (en) * | 2020-01-16 | 2020-06-02 | 东南大学 | Low dropout power supply ripple suppression linear voltage regulator |
| CN111221373B (en) * | 2020-01-16 | 2022-03-11 | 东南大学 | Low dropout power supply ripple suppression linear voltage regulator |
| CN112152437A (en) * | 2020-11-16 | 2020-12-29 | 深圳市芯天下技术有限公司 | Method and circuit for inhibiting ripples and charge pump |
| CN113064460A (en) * | 2021-03-24 | 2021-07-02 | 成都瓴科微电子有限责任公司 | Low dropout regulator circuit with high power supply rejection ratio |
| TWI811974B (en) * | 2022-01-26 | 2023-08-11 | 大陸商星宸科技股份有限公司 | Low-dropout regulator having bidirectional current adjustment |
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| CN106094966B (en) | 2019-08-16 |
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