CN106774577A - A kind of power supply circuit for improving PSRR - Google Patents
A kind of power supply circuit for improving PSRR Download PDFInfo
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- CN106774577A CN106774577A CN201611252053.8A CN201611252053A CN106774577A CN 106774577 A CN106774577 A CN 106774577A CN 201611252053 A CN201611252053 A CN 201611252053A CN 106774577 A CN106774577 A CN 106774577A
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- Prior art keywords
- power supply
- transistor
- circuit
- low pressure
- pressure difference
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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
Abstract
A kind of power supply circuit for improving PSRR, including, low pressure difference linear voltage regulator and output noise isolation circuit, wherein, the output noise isolation circuit, including, the first transistor, filter resistance, filter capacitor, one end of the filter resistance, the drain electrode of the first transistor, and low pressure difference linear voltage regulator output are connected；One end of the other end connection filter capacitor of the filter resistance and the grid of the first transistor；The other end ground connection of the filter capacitor；The circuit sensitive to power supply noise outside the source electrode connection of the first transistor.Power supply circuit of the invention, is combined by both low pressure difference linear voltage regulator and output noise isolation circuit, is effectively improved the PSRR of IC system, and influence of the power supply noise to system has been dramatically reduced.
Description
Technical field
The present invention relates to integrated circuit fields, more particularly to a kind of power supply circuit for improving PSRR.
Background technology
With the further development of IC system integrated technology, PMU（Power Management Unit, power supply pipe
Reason unit）As the important component of influence systematic function, the requirement more and more higher to system power supply power supply stability.It is unstable
Fixed supply voltage will certainly influence the waveform of output signal, and the amplitude for influenceing then depends on PSRR.
LDO is a kind of low pressure difference linear voltage regulator, and the output through overregulating is produced using the power tube for being operated in linear zone
Voltage, quiescent current is small, low cost, using simple, generally with relatively low own noise and PSRR higher（Power
Supply Rejection Ratio, PSRR）.In the application systems such as radio frequency, audio, ADC conversions, PSRR
It is a critically important parameter, embodies the anti-noise ability of LDO, PSRR values are higher, and LDO output ripples is lower.Fig. 1 is existing low
Pressure difference linear voltage regulator application scheme, as shown in figure 1, tradition LDO application schemes, its output is directly connected to sensitive to power supply noise
Circuit, by taking voltage controlled oscillator VCO as an example.During practical application, influenceed by power supply ripple, noise etc. so that the output of LDO has
Larger noise, can be directly coupled to follow-up voltage controlled oscillator VCO circuit, reduce the PSRR of system, influence systematic function.
The content of the invention
In order to solve the deficiency of prior art presence, it is an object of the invention to provide a kind of confession for improving PSRR
Circuit, can be with the influence of less cost reduction power supply noise.
To achieve the above object, the present invention provides a kind of power supply circuit for improving PSRR, including, low pressure difference linearity
Voltage-stablizer and output noise isolation circuit, it is characterised in that the output noise isolation circuit, including, the first transistor, filtering
Resistance, filter capacitor, wherein,
One end of the filter resistance, the drain electrode of the first transistor, and low pressure difference linear voltage regulator output are connected
Connect；One end of the other end connection filter capacitor of the filter resistance and the grid of the first transistor；The filter capacitor
The other end ground connection；The circuit sensitive to power supply noise outside the source electrode connection of the first transistor.
The power supply circuit for improving PSRR of the invention, has technical effect that, the letter of output noise isolation circuit structure
Influence of the output noise of isolation low pressure difference linear voltage regulator to subsequent conditioning circuit module is singly can be very good, by low pressure difference linearity
Both voltage-stablizer and output noise isolation circuit are combined, and simply and effectively improve the PSRR of IC system, significantly
Reduce influence of the power supply noise to system degree.
Other features and advantages of the present invention will be illustrated in the following description, also, the partly change from specification
Obtain it is clear that or being understood by implementing the present invention.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for specification, and with it is of the invention
Embodiment together, for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is existing low pressure difference linear voltage regulator application scheme schematic diagram；
Fig. 2 is the power supply circuit embodiment schematic diagram according to raising PSRR of the invention.
Specific embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that preferred reality described herein
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Fig. 2 is the power supply circuit embodiment schematic diagram according to raising PSRR of the invention, as shown in Fig. 2 this hair
The power supply circuit of bright raising PSRR, including low pressure difference linear voltage regulator 201 and output noise isolation circuit 202, its
In
Described basic low pressure difference linear voltage regulator 201, including, error amplifier AMP, buffer BUF, power tube MP, first
Resistance R1, second resistance R2With load capacitance CL.The inverting input connection outside input reference voltage of error amplifier AMP
VREF；The normal phase input end input low pressure difference linear voltage regulator LDO output voltages V of error amplifier AMPOUTPartial pressure；Error is put
The input of the output connection buffer BUF of big device AMP；The output driving power tube M of buffer BUFPGrid；Power tube MP
Source electrode connection input signal VIN；Power tube MPDrain electrode as low pressure difference linear voltage regulator LDO output, connect first resistor
R1One end and load capacitance CLOne end；First resistor R1Other end connection second resistance R2One end；Second resistance R2's
The other end and load capacitance CLThe other end be grounded.
Described output noise isolation circuit 201, including filter resistance R3, filter capacitor C and the first transistor M1.It is described
Low pressure difference linear voltage regulator 201 output end VOUTConnection filter resistance R3One end and the first transistor M1Drain electrode；Filtering
Resistance R3Other end connection filter capacitor C one end and the first transistor M1Grid；The other end ground connection of filter capacitor C；The
One transistor M1Source electrode connection transistor seconds M2Drain electrode；Transistor seconds M2Grid connection external control signal VCTL；
Transistor seconds M2Source electrode connect follow-up voltage controlled oscillator VCO circuit, for voltage controlled oscillator VCO circuit provides power supply.
The power supply circuit for improving PSRR of the invention, its operation principle is as follows：
The error amplifier AMP of low pressure difference linear voltage regulator 201 detects the difference of two ends input voltage, using power tube MP,
One resistance R1With second resistance R2The feedback network of composition is clamped to anti-phase input by error amplifier AMP positive input voltage values
Reference voltage VREF, the output connection noise isolation circuit of low pressure difference linear voltage regulator 201, by filter resistance R3With filter capacitor C
The filter network isolation low pressure difference linear voltage regulator 201 of composition exports the noise for passing to subsequent conditioning circuit.
Although power input voltage will not be mutated, the ac small signal from power end, particularly some high-frequency noises
The PSRR of influence, low pressure difference linear voltage regulator 201 can be produced to embody the output of low pressure difference linear voltage regulator 201
The suppression situation of noise during output voltage is to input power in certain frequency range.Increase output noise isolation circuit simultaneously, enter
The influence of one step reduction power supply noise, realizes the overall lifting of system power supply rejection ratio.
One of ordinary skill in the art will appreciate that：The foregoing is only the preferred embodiments of the present invention, and without
In the limitation present invention, although being described in detail to the present invention with reference to the foregoing embodiments, for those skilled in the art
For, it can still be modified to the technical scheme that foregoing embodiments are recorded, or which part technical characteristic is entered
Row equivalent.All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., all should include
Within protection scope of the present invention.
Claims (1)
1. a kind of power supply circuit for improving PSRR, including, low pressure difference linear voltage regulator and output noise isolation circuit, its
It is characterised by, the output noise isolation circuit, including, the first transistor, filter resistance, filter capacitor, wherein,
One end of the filter resistance, the drain electrode of the first transistor, and low pressure difference linear voltage regulator output are connected
Connect；One end of the other end connection filter capacitor of the filter resistance and the grid of the first transistor；The filter capacitor
The other end ground connection；The circuit sensitive to power supply noise outside the source electrode connection of the first transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611252053.8A CN106774577A (en) | 2016-12-30 | 2016-12-30 | A kind of power supply circuit for improving PSRR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611252053.8A CN106774577A (en) | 2016-12-30 | 2016-12-30 | A kind of power supply circuit for improving PSRR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106774577A true CN106774577A (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611252053.8A Pending CN106774577A (en) | 2016-12-30 | 2016-12-30 | A kind of power supply circuit for improving PSRR |
Country Status (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613949A (en) * | 2017-10-05 | 2019-04-12 | 原相科技股份有限公司 | Low dropout voltage regulator |
| WO2019157991A1 (en) * | 2018-02-13 | 2019-08-22 | 杭州芯元微电子有限公司 | Low quiescent current, high psrr, low-dropout linear regulator circuit |
| CN111399583A (en) * | 2020-03-16 | 2020-07-10 | 西安理工大学 | L DO circuit with high power supply rejection ratio in wide load range |
| CN112650348A (en) * | 2020-12-31 | 2021-04-13 | 成都瓴科微电子有限责任公司 | Low dropout regulator |
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| US20090085534A1 (en) * | 2007-09-28 | 2009-04-02 | Qualcomm Incorporated | Wideband low dropout voltage regulator |
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| CN103455076A (en) * | 2013-09-12 | 2013-12-18 | 福建一丁芯光通信科技有限公司 | High power supply rejection LDO voltage stabilizer based on native NMOS transistor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613949A (en) * | 2017-10-05 | 2019-04-12 | 原相科技股份有限公司 | Low dropout voltage regulator |
| WO2019157991A1 (en) * | 2018-02-13 | 2019-08-22 | 杭州芯元微电子有限公司 | Low quiescent current, high psrr, low-dropout linear regulator circuit |
| CN111399583A (en) * | 2020-03-16 | 2020-07-10 | 西安理工大学 | L DO circuit with high power supply rejection ratio in wide load range |
| CN112650348A (en) * | 2020-12-31 | 2021-04-13 | 成都瓴科微电子有限责任公司 | Low dropout regulator |
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Application publication date: 20170531 |