CN206096995U - Wide band high power supply rejection ratio's linear voltage regulator - Google Patents
Wide band high power supply rejection ratio's linear voltage regulator Download PDFInfo
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- CN206096995U CN206096995U CN201620942569.4U CN201620942569U CN206096995U CN 206096995 U CN206096995 U CN 206096995U CN 201620942569 U CN201620942569 U CN 201620942569U CN 206096995 U CN206096995 U CN 206096995U
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Abstract
The utility model discloses a wide band high power supply rejection ratio's linear voltage regulator, its characterized in that, this linear voltage regulator include the poor linear voltage regulator LDO of power supply ripple preprocessor and low pressure, the output of power supply ripple preprocessor links to each other with low -dropout regulator LDO input power, power supply ripple preprocessor is used for producing the DC voltage VP1 that the wide band ripple restraines, low dropout regulator LDO is used for producing direct current output voltage VOUT, power supply ripple preprocessor includes resistive voltage divider circuit, low pass filter and voltage follower, resistive voltage divider circuit, low pass filter, voltage follower are consecutive, through the voltage buffering level of using stable ripple clamping voltage VG1 and depletion type transister to constitute, the ripple of low dropout regulator LDO input power has been reduced. The utility model has the characteristics of the high PSRR load range of wide band, to system stability influence is little, current efficiency is high.
Description
Technical field
This utility model belongs to high performance analog IC design technical field, and in particular to a kind of high power supply suppression of wideband
The linear voltage regulator of ratio processed.
Background technology
Low pressure difference linear voltage regulator (LDO), due to circuit structure it is simple, transient response speed is fast, cost is low excellent
Point is used widely.The DC high voltage of input can be converted to low pressure difference linear voltage regulator the low stricture of vagina needed for electronic equipment
The DC low-voltage of ripple, low noise.Generally, on the input direct voltage of low pressure difference linear voltage regulator, broadband can be superimposed
AC ripple, the stability and circuit performance of equipment and circuit can be affected.When high-performance power supply is needed, nonideal group
Part and parasitic capacitance can change the ideal characterisiticses of linear voltage regulator, reduce the inhibitory action to mains fluctuations.Power supply suppresses
What is weighed than this index is ability that manostat suppresses the AC signal being superimposed upon on normal input direct voltage.Power supply suppresses
It is more maximum than in low frequency, suppress the ability of mains fluctuations stronger, and in high frequency, this ability is just reduced.It is actual low
The design of pressure reduction linear voltage regulator, its PSRR from 1kHz to 10kHz in the range of begin to decline.
With the raising of requirement of the user to power supply ripple rejection ability, low noise, high PSRR linear voltage regulator
It is required which still has the good PSRR of 60dB when in 100kHz.In more than 100kHz, PSRR is mainly received
The impact of output capacitance, parasitic element and 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, the open-loop gain just amplified using larger error signal, or the coupled capacitor of increase outfan, drop
The bandwidth of low linear voltage regulator.Open-loop gain is amplified using larger error, larger challenge can be brought to circuit design.And increase
The mode of big outfan coupled capacitor, can increase the area of chip again, increase production cost.
The content of the invention
According to above the deficiencies in the prior art, technical problem to be solved in the utility model is to propose a kind of high electricity of wideband
The linear voltage regulator of source rejection ratio, affect little, current efficiency high with wideband high PSRR characteristic, on system stability etc.
Feature.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is：A kind of wideband high PSRR
Linear voltage regulator, it is characterised in that the linear voltage regulator includes power supply ripple preprocessor and low pressure difference linear voltage regulator
LDO；The power supply ripple preprocessor output is connected with low-dropout regulator LDO input powers；The power supply ripple pretreatment
Device is used for the DC voltage VP1 for producing wideband Ripple Suppression；The low pressure difference linear voltage regulator LDO is used to produce direct current output electricity
Pressure VOUT；The power-supply ripple preprocessor includes resistor voltage divider circuit, low pass filter and voltage follower；The resistance point
Volt circuit, low pass filter, voltage follower are sequentially connected；The resitstance voltage divider is low by resistor voltage divider circuit generation one
In reference voltage V R1 of supply voltage；The low pass filter is used to filter the power supply disturbance and noise on VR1, obtains ripple
Suppress voltage VG1；The voltage follower is used for the DC voltage VP1 for producing Ripple Suppression.The resistor voltage divider circuit passes through
Partial pressure obtains reference voltage V R1 for being slightly below supply voltage.The resistor voltage divider circuit is series resistance bleeder circuit.
The voltage follower is that, using depletion mode transistor M1, depletion mode transistor M1 connects into power supply buffer stage, stricture of vagina
Ripple suppresses voltage VG1 to deliver to the grid of depletion mode transistor M1, the source electrode of M1 obtain close to Ripple Suppression voltage VG1 with
With voltage VP1.
The low pressure difference linear voltage regulator LDO includes band-gap reference circuit VBG, error amplifier AMP, adjustment pipe, feedback
Resistor network, output coupling capacitor and bias current adjustment circuit IBIAS；The band-gap reference circuit VBG, bias current adjustment
Circuit I BIAS connects with error amplifier AMP respectively.
The 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
Afterwards, the grid of adjustment pipe M2 is connected to, output voltage VO UT is controlled；Resistance R5 and R6 constitute feedback network, by partial pressure
VFB feeds back to the positive polarity input of error amplifier AMP.
As the DC voltage VP1 through Ripple Suppression reduces the input power fluctuation of low pressure difference linear voltage regulator LDO,
Obtain the VD VOUT of wideband high PSRR.
This utility model beneficial effect is:Constituted by using stable Ripple Suppression voltage VG1 and depletion mode transistor
Voltage buffer level, it is possible to obtain the DC voltage VP1 of relatively stable wideband Ripple Suppression, reduce low pressure difference linearity voltage stabilizing
The ripple of device LDO input powers.Power input of the output of voltage buffer level as low pressure difference linear voltage regulator, finally gives tool
There is output voltage VO UT of wideband high PSRR, improve the precision of electrical equipment.This utility model has the high PSRR of wideband
Loading range, on system stability affect it is little, current efficiency is high the features such as.
Description of the drawings
Below the labelling in the content and figure expressed by this specification accompanying drawing is briefly described：
Fig. 1 is the linear voltage regulator system structure of the wideband high PSRR of specific embodiment of the present utility model
Figure.
Fig. 2 is the schematic diagram of the wideband high PSRR linear voltage-stabilizing circuit of specific embodiment of the present utility model.
Specific embodiment
Below against accompanying drawing, by the description to embodiment, specific embodiment of the present utility model is each as involved by
The shape of component, the mutual alignment between construction, each several part and annexation, the effect of each several part and operation principle, manufacture work
Skill and operate with method etc., are described in further detail, to help those skilled in the art to invention of the present utility model
Design, technical scheme have more complete, accurate and deep understanding.
The utility model discloses a kind of linear voltage regulator with wideband high PSRR, using the knot of two-stage voltage stabilizing
Structure, obtains wideband high PSRR characteristic.Its complete circuit is by primary power source ripple preprocessor and one-level low voltage difference line
Property manostat composition.Wherein, power supply ripple preprocessor is by resistor voltage divider circuit, low pass filter, voltage follower concatenation group
Into.One reference voltage V R1 less than supply voltage is produced by resistor voltage divider circuit, through low pass filter, power supply is filtered
Interference and noise, obtain with compared with high stability Ripple Suppression voltage VG1.Obtain being close to VG1 numerical value by voltage follower
DC voltage VP1, VP1 eventually serves as the power supply of low pressure difference linear voltage regulator, and low pressure difference linear voltage regulator passes through loop
Control, provides stable voltage output VOUT for load, so as to realize wideband Ripple Suppression.Technical scheme is referring to Fig. 1.
As shown in Fig. 2 in order that linear voltage regulator acquisition high PSRR, employs 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 again comprising band-gap reference circuit (VBG),
Error amplifier (AMP), adjustment pipe, feedback resistive network, output coupling capacitor, bias current adjustment circuit (IBIAS) composition.
In first order power supply ripple preprocessor, by the bleeder circuit that is made up of resistance R1 and R2 and low pass filter
LPF, obtains a relatively stable d. c. voltage signal VG1.One is produced using the resistor voltage divider circuit that resistance R1 and R2 are constituted
Individual reference voltage V R1 less than supply voltage, it is also possible to provide this reference voltage V R1 by other kinds of circuit.The benchmark electricity
VR1 is again through low pass filter for pressure, realizes filtering for 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 is connected into
Power supply buffer stage, Ripple Suppression voltage VG1 deliver to the grid of depletion mode transistor M1, can obtain close to stricture of vagina in the source electrode of M1
Ripple suppresses more stable follow the voltage VP1, power inputs of the VP1 as low-dropout linear voltage-regulating circuit LDO of voltage VG1 to have
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 control the static work(of error amplifier AMP work
Consumption.Resistance R3 and R4 constitute feedback network, and partial pressure VFB is fed back to the positive polarity input of error amplifier AMP.Reference
The difference of voltage VREF and feedback voltage V FB after amplification is connected to the grid of adjustment pipe M2, output voltage VO UT is carried out
Control.As the DC voltage VP1 through Ripple Suppression reduces the input power fluctuation of low pressure difference linear voltage regulator LDO, most
The VD VOUT of wideband high PSRR can be obtained eventually.So that linear voltage regulator of the present utility model is provided
There is the characteristic of the high Ripple Suppression of wideband to the output voltage of load.
This utility model is exemplarily described above in conjunction with accompanying drawing, it is clear that this utility model is implemented not to be received
The restriction of aforesaid way, as long as employing changing for the various unsubstantialities that method design of the present utility model and technical scheme are carried out
Enter, or it is not improved by it is of the present utility model design and technical scheme directly apply to other occasions, in this utility model
Protection domain within.The protection domain that protection domain of the present utility model should be limited by claims is defined.
Claims (8)
1. a kind of linear voltage regulator of wideband high PSRR, it is characterised in that the linear voltage regulator includes that power supply ripple is pre-
Processor and low pressure difference linear voltage regulator LDO；
The power supply ripple preprocessor output is connected with low-dropout regulator LDO input powers；
The power supply ripple preprocessor is used for the DC voltage VP1 for producing wideband Ripple Suppression；
The low pressure difference linear voltage regulator LDO is used to produce VD VOUT.
2. the linear voltage regulator of wideband high PSRR according to claim 1, it is characterised in that the power-supply ripple
Preprocessor includes resistor voltage divider circuit, low pass filter and voltage follower；
The resistor voltage divider circuit, low pass filter, voltage follower are sequentially connected；
The resitstance voltage divider produces reference voltage V R1 less than supply voltage by resistor voltage divider circuit；
The low pass filter is used to filter the power supply disturbance and noise on VR1, obtains Ripple Suppression voltage VG1；
The voltage follower is used for the DC voltage VP1 for producing Ripple Suppression.
3. the linear voltage regulator of wideband high PSRR according to claim 2, it is characterised in that the electric resistance partial pressure
Circuit obtains reference voltage V R1 for being slightly below supply voltage by partial pressure.
4. the linear voltage regulator of wideband high PSRR according to claim 3, it is characterised in that the electric resistance partial pressure
Circuit is series resistance bleeder circuit.
5. the linear voltage regulator of wideband high PSRR according to claim 2, it is characterised in that the voltage follow
Device is that, using depletion mode transistor M1, depletion mode transistor M1 connects into power supply buffer stage, and Ripple Suppression voltage VG1 is delivered to and exhausted
The grid of transistor npn npn M1, obtains following voltage VP1 close to Ripple Suppression voltage VG1 in the source electrode of M1.
6. the linear voltage regulator of wideband high PSRR according to claim 1, it is characterised in that the low voltage difference line
Property manostat LDO include band-gap reference circuit VBG, error amplifier AMP, adjustment pipe, feedback resistive network, output coupling capacitor
With bias current adjustment circuit IBIAS；The band-gap reference circuit VBG, bias current adjustment circuit IBIAS are put with error respectively
Big device AMP connections.
7. the linear voltage regulator of wideband high PSRR according to claim 6, it is characterised in that the band-gap reference
Circuit VBG provides reference voltage VREF for low pressure difference linear voltage regulator；Bias current generating circuit IBIAS control benchmark electricity
The size of stream IB；The difference of reference voltage VREF and feedback voltage V FB is connected to the grid of adjustment pipe M2 after amplification
Pole, is controlled to output voltage VO UT；Resistance R5 and R6 constitute feedback network, and partial pressure VFB is fed back to error amplifier AMP
Positive polarity input.
8. the linear voltage regulator of wideband high PSRR 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, obtains wideband high PSRR
VD VOUT.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620942569.4U CN206096995U (en) | 2016-08-25 | 2016-08-25 | Wide band high power supply rejection ratio's linear voltage regulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620942569.4U CN206096995U (en) | 2016-08-25 | 2016-08-25 | Wide band high power supply rejection ratio's linear voltage regulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783534A (en) * | 2021-09-15 | 2021-12-10 | 武汉市聚芯微电子有限责任公司 | Feedback type audio power amplifying circuit, audio amplifying device and electronic device |
-
2016
- 2016-08-25 CN CN201620942569.4U patent/CN206096995U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783534A (en) * | 2021-09-15 | 2021-12-10 | 武汉市聚芯微电子有限责任公司 | Feedback type audio power amplifying circuit, audio amplifying device and electronic device |
| CN113783534B (en) * | 2021-09-15 | 2022-05-17 | 武汉市聚芯微电子有限责任公司 | Feedback type audio power amplifying circuit, audio amplifying device and electronic device |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 1401~1403, building 4, Outsourcing Industrial Park, No. 717 South Zhongshan Road, Wuhu hi tech Zone, Anhui Patentee after: Huang Jipo Address before: 201100 Shanghai City, Minhang District Minhang District Gumei road 377 Lane 18, room 801 Patentee before: Huang Jipo |
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| CP02 | Change in the address of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190125 Address after: Room 1401, 1402 and 1403 on the north side of 14th floor of No. 4 Building of Service Outsourcing Industrial Park, Yijiang District, Wuhu City, Anhui Province Patentee after: Anhui saiteng Microelectronics Co. Ltd. Address before: Building 1401-1403, No. 4, Outsourcing Industrial Park, No. 717 Zhongshan South Road, Wuhu High-tech Zone, Anhui Province Patentee before: Huang Jipo |
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| TR01 | Transfer of patent right |