CN108227801A - A kind of low pressure difference linear voltage regulator of high PSRR - Google Patents
A kind of low pressure difference linear voltage regulator of high PSRR Download PDFInfo
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- CN108227801A CN108227801A CN201611133325.2A CN201611133325A CN108227801A CN 108227801 A CN108227801 A CN 108227801A CN 201611133325 A CN201611133325 A CN 201611133325A CN 108227801 A CN108227801 A CN 108227801A
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- low pressure
- pressure difference
- difference linear
- voltage regulator
- 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
- G05F1/561—Voltage to current converters
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- General Physics & Mathematics (AREA)
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- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The present invention provides a kind of low pressure difference linear voltage regulators of high PSRR.The low pressure difference linear voltage regulator includes filter capacitor, filter resistance, feed-forward amplifier, error amplifier, conduction pipe, feedback resistance and load capacitance, it is characterized in that, filter capacitor and filter resistance form high-pass filter, and it is connected with feed-forward amplifier, feed-forward amplifier is connected with error amplifier by compensating electric capacity, when frequency is below 1KHZ, feed-forward amplifier disconnects low pressure difference linear voltage regulator loop, when frequency is more than 1KHZ, feed-forward amplifier connection low pressure difference linear voltage regulator loop；The present invention offsets access to build a new noise channel using the feed-forward noise that high-pass filter and feed-forward amplifier are formed, the noise channel that resistance introduces between noise channel and MOS conduction pipe source and drain that the new noise channel introduced can effectively be brought with low pressure difference linear voltage regulator loop offsets so that the performance of PSRR improves about 10dB decibels in the range of 100KHZ.
Description
Technical field
The present invention relates to the low of ic power managing chip technical field more particularly to a kind of high PSRR
Pressure difference linear voltage regulator.
Background technology
Nowadays smart home device has been directed to the every aspect of our lives.Power management chip of good performance will
The promotion of smart machine performance can be greatly facilitated, in addition, have become must not in people's daily life for portable electronic product
The part lacked, mobile phone, all from not power management chip in these products of tablet computer.Power management chip is set in electronics
The transformation to electric energy, distribution, detection and other functions are shouldered in standby.Low pressure difference linear voltage regulator（Low Dropout
Linear Regulator, low pressure difference linear voltage regulator）It is a kind of vital device of power management chip, low pressure difference linearity
Voltage-stablizer can provide one not by external environmental interference, the output of stable power supply for system, thus be power management chip
Core component.Power supply rejection ratio (the Power of PSR (Primary Side Regulation, primary side are reconciled) power supply
Supply Rejection Ratio, PSRR) index be low pressure difference linear voltage regulator a main performance index, usually electricity
The interference generated on source can have an impact the output of voltage-stablizer, and power supply rejection ratio is higher, the output of low pressure difference linear voltage regulator
Voltage is more stable.Under normal conditions, the PSRR of PSR power supplys can be with frequency（frequency）Raising and be deteriorated, be in frequency
Already less than 35dB during 100KHZ, thus it is guaranteed that low pressure difference linear voltage regulator exports stable voltage just in the band limits
It is problematic.
It is existing low pressure difference linear voltage regulator, i.e. series voltage regulator referring to Fig. 1.The series voltage regulator is anti-by resistance
It presents network and forms a negative feedback closed loop system, when low pressure difference linear voltage regulator output end voltage increases, pass through resistance feedback
Network provides feedback signal, and error amplifier noninverting input voltage rises, and passes through and error amplifier reverse input end
Reference voltage is compared, the output signal of alignment error amplifier, is increased the gate voltage of power tube, is reduced the low pressure difference linearity
The output voltage of voltage-stablizer；Conversely, when low pressure difference linear voltage regulator output end voltage declines, provided by resistance-feedback network
Feedback signal, error amplifier noninverting input voltage declines, and passes through the reference voltage with error amplifier reverse input end
It is compared, the output signal of alignment error amplifier, reduces the gate voltage of power tube, raise the defeated of low pressure difference linear voltage regulator
Go out voltage.
It is the existing low pressure difference linear voltage regulator with four noise channels referring to Fig. 2.Wherein, first is low pressure
The noise channel that difference linear constant voltage regulator loop is brought, Article 2 are the noise channels that the resistance between MOS conduction pipe source and drain introduces,
Article 3 is the noise channel of error amplifier Ae thereins, and Article 4 is the noise channel for having reference data VREF to introduce.
It can be obtained according to following PSRR calculation formula：
Above-mentioned PSRR calculation formula can obtain：PSRR is smaller, i.e. the dB decibel values of PSRR are bigger, and stability is better, anti-interference
Ability is stronger.
As shown in figure 3, four contrast curves between noise channel and frequency for existing low pressure difference linear voltage regulator.
In the low frequency stage, access Path1, access Path2, the PSRR performances of access Path3, access Path4 are all relatively good, with frequency
Increase, the influence very little of 4 two accesses of access Path 3 and access Path, and by access Path1 and access Path 2 two
The influence that access is brought is so that the PSRR indexs of low differential voltage linear voltage stabilizer circuit are deteriorated.In practical applications, low pressure difference linearity
Voltage-stablizer is often connected on after DC-DC Switching regulators, and DC-DC Switching regulators are due to the shadow by switching frequency
It rings, output voltage can carry very big ripple, if if the PSRR poor-performings of low pressure difference linear voltage regulator, can cause final
Power supply output is unstable.Critical issue therefore, it is necessary to solution is to design a low pressure difference linear voltage regulator so that it is more
There is better PSRR values, as shown in figure 4, being the low pressure difference linearity voltage stabilizing of existing low power supply rejection ratio in high frequency range
Device, function are that the supply voltage of 3.3V is converted to the power supply output of a stable 1.55V.The low pressure difference linear voltage regulator
PSRR in 10KHZ about 50dB decibels, and the PSRR values in 100KHZ are down to 34dB decibels, but the low pressure
The drawbacks of difference linear constant voltage regulator is exactly that PSRR indexs in the range of 100KHZ are poor, constrains low pressure difference linear voltage regulator output
Stability.
Invention content
In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide one kind to carry feed-forward amplifier noise
Offset the low pressure difference linear voltage regulator of access so that premise of the load current of low pressure difference linear voltage regulator in the range of 100mA
Under, the PSRR values in the range of 1 ~ 100KHZ are held in 48dB decibels or more, and the PSRR values in the range of 10KHZ can reach
To 60dB decibels or more so that low pressure difference linear voltage regulator can export stable voltage in the band limits.
In order to reach above-mentioned technical purpose, the technical solution adopted in the present invention is：
A kind of low pressure difference linear voltage regulator of high PSRR, including filter capacitor, filter resistance, feed-forward amplifier, error
Amplifier, conduction pipe, feedback resistance and load capacitance, which is characterized in that filter capacitor and filter resistance form high-pass filter,
And be connected with feed-forward amplifier, feed-forward amplifier is connected with error amplifier by compensating electric capacity, is 1KHZ in frequency
When following, feed-forward amplifier is not turned on low pressure difference linear voltage regulator loop, and when frequency is more than 1KHZ, feed-forward amplifier access is low
Pressure difference linear voltage regulator loop；
When, there are one during positive power-supply fluctuation, so that low pressure difference linearity is steady on the input voltage VCC of low pressure difference linear voltage regulator
The output voltage Vout of depressor has increased trend, meanwhile, the positive power-supply fluctuation of low pressure difference linear voltage regulator input voltage VCC
The input terminal voltage of feed-forward amplifier can be caused to increase, the grid voltage increase of conduction pipe, so that low pressure difference linear voltage regulator
Output voltage Vout has the tendency that reduction, the output voltage Vout increase tendencies and its output voltage of low pressure difference linear voltage regulator
Vout reduces cancelling out each other for trend so that the output voltage Vout of low pressure difference linear voltage regulator keeps stablizing.
Preferably, in the low pressure difference linear voltage regulator, feed-forward amplifier and error amplifier are all folded using high-gain
Formula cascode structure.
It is new to build one that the feed-forward noise that the present invention is formed using high-pass filter and feed-forward amplifier offsets access
Noise channel, the advantageous effect obtained be, the new noise channel of introducing can effectively with low pressure difference linear voltage regulator loop
The noise channel that resistance introduces between the noise channel and MOS conduction pipe source and drain brought offsets so that the performance of PSRR exists
About 10dB decibels is improved in the range of 100KHZ.
The present invention will be further described with reference to the accompanying drawings and detailed description.
Description of the drawings
Fig. 1 is existing low differential voltage linear voltage stabilizer circuit figure.
Fig. 2 is the existing low differential voltage linear voltage stabilizer circuit figure with four noise channels.
Fig. 3 is four contrast curves between noise channel and frequency of existing low pressure difference linear voltage regulator.
Fig. 4 is the low differential voltage linear voltage stabilizer circuit figure of existing low power supply rejection ratio.
Fig. 5 is low dropout linear regulator structure figure of the present invention specific implementation with high PSRR.
Fig. 6 is the amplifier circuit configuration figure that the present invention is embodied.
Fig. 7 is the low differential voltage linear voltage stabilizer circuit figure that the present invention has small-signal model feed-forward noise access.
Fig. 8 is the four of low pressure difference linear voltage regulator correlation curves between noise channel and frequency that the present invention is embodied
Figure.
Specific embodiment
Referring to Fig. 5, for low dropout linear regulator structure figure of the present invention specific implementation with high PSRR.This is low
Pressure difference linear voltage regulator has feed-forward noise access, which includes filter capacitor Cf, filter resistance Rf, preceding
Amplifier AFF, error amplifier AFB, conduction pipe Mp, feedback resistance R1, feedback resistance R2 and load capacitance CL are presented, wherein, filter
Wave capacitance Cf and filter resistance Rf forms high-pass filter, and feed-forward amplifier AFF and error amplifier AFB form amplifier electricity
Road, high-pass filter are connected with feed-forward amplifier AFF, and feed-forward amplifier AFF and error amplifier AFB passes through compensating electric capacity Cc
It connects.Feed-forward amplifier AFF and error amplifier AFB uses high-gain Foldable cascade structure.
As shown in fig. 6, the amplifier circuit configuration figure being embodied for the present invention.Amplifier circuit is by feed-forward amplifier
AFF and error amplifier AFB compositions, when frequency is below 1KHZ, feed-forward amplifier AFF is not turned on low pressure difference linear voltage regulator
Loop, when frequency is more than 1KHZ, feed-forward amplifier AFF access low pressure difference linear voltage regulator loops；Outer power voltage passes through
The output voltage VCCB obtained after current-limiting protection module OCP, when switching to the input voltage of low pressure difference linear voltage regulator 3.3V, this
When, the 3.3V input voltages VCC of low pressure difference linear voltage regulator can cause low pressure difference linear voltage regulator there are one positive power-supply fluctuation
Output voltage Vout have increased trend, meanwhile, the positive power-supply fluctuation of low pressure difference linear voltage regulator input voltage VCC can make
The input terminal voltage increase of feed-forward amplifier AFF is obtained, the grid voltage of conduction pipe Mp increases, so that low pressure difference linear voltage regulator
Output voltage Vout has the tendency that reduction, the output voltage Vout increase tendencies and its output voltage of low pressure difference linear voltage regulator
Vout reduces trend and cancels out each other, so that the output voltage Vout stable of low pressure difference linear voltage regulator is in 1.55V, and protects
Higher value can be reached within the scope of 100KHZ by holding the PSRR values of low pressure difference linear voltage regulator.
It is how to improve PSRR values to further quantify to introduce after feed-forward noise access, now analysis has small-signal model
The low pressure difference linear voltage regulator of feed-forward noise access, as shown in fig. 7, there is the low of small-signal model feed-forward noise access for the present invention
Pressure difference linear regulator circuit figure.The PSRR of low pressure difference linear voltage regulator that can obtain the present invention by small-signal model analysis can
To be calculated as following formula, wherein being the output pole of Wo low pressure difference linear voltage regulators, LG is loop gain,,
Above-mentioned formula shows that the raising of the PSRR performances of the invention has direct relationship with feedforward gain.As feed-forward amplifier AFF
With inverse it is roughly equal when, it is ensured that the PSRR performances of low pressure difference linear voltage regulator are best.
The results are shown in Figure 8 for actual emulation, and the four of low pressure difference linear voltage regulator noises being embodied for the present invention lead to
Contrast curve between road and frequency.In 1KHZ, the value of PSRR is at least 60.96dB, and in 10KHZ, the value of PSRR is 60.3
DB, in 100KHZ, the value of PSRR is at least 48.5dB decibels, than before without the low voltage difference line of progress feed-forward noise counteracting
Property voltage-stablizer, the PSRR values in the range of 1 ~ 100KHZ increase about 10dB decibels or so.
The present invention is not limited to embodiment discussed above, more than the description of specific embodiment is intended to retouch
It states and illustrates technical solution of the present invention.The obvious transformation or replacement enlightened based on the present invention should also be as being considered
Fall into protection scope of the present invention；Above specific embodiment is used for disclosing the best implementation of the present invention, so that this
The those of ordinary skill in field can apply numerous embodiments of the invention and a variety of alternatives to reach the present invention's
Purpose.
Claims (2)
1. a kind of low pressure difference linear voltage regulator of high PSRR, including filter capacitor, filter resistance, feed-forward amplifier, mistake
Poor amplifier, conduction pipe, feedback resistance and load capacitance, which is characterized in that filter capacitor and filter resistance form high-pass filtering
Device, and be connected with feed-forward amplifier, feed-forward amplifier is connected with error amplifier by compensating electric capacity, is in frequency
During below 1KHZ, feed-forward amplifier disconnects low pressure difference linear voltage regulator loop, when frequency is more than 1KHZ, feed-forward amplifier connection
Low pressure difference linear voltage regulator loop；
When, there are one during positive power-supply fluctuation, so that low pressure difference linearity is steady on the input voltage VCC of low pressure difference linear voltage regulator
The output voltage Vout of depressor has increased trend, meanwhile, the positive power-supply fluctuation of low pressure difference linear voltage regulator input voltage VCC
The input terminal voltage of feed-forward amplifier can be caused to increase, the grid voltage increase of conduction pipe, so that low pressure difference linear voltage regulator
Output voltage Vout has the tendency that reduction, the output voltage Vout increase tendencies and its output voltage of low pressure difference linear voltage regulator
Vout reduces cancelling out each other for trend so that the output voltage Vout of low pressure difference linear voltage regulator keeps stablizing.
2. low pressure difference linear voltage regulator as described in claim 1, which is characterized in that preceding in the low pressure difference linear voltage regulator
It presents amplifier and error amplifier and all uses high-gain Foldable cascade structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611133325.2A CN108227801A (en) | 2016-12-10 | 2016-12-10 | A kind of low pressure difference linear voltage regulator of high PSRR |
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| CN201611133325.2A CN108227801A (en) | 2016-12-10 | 2016-12-10 | A kind of low pressure difference linear voltage regulator of high PSRR |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149962A (en) * | 2018-09-03 | 2019-01-04 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Method and apparatus based on voltage reference signal compensating direct current power supply system stability |
| CN109240401A (en) * | 2018-09-05 | 2019-01-18 | 光梓信息科技（上海）有限公司 | Low-dropout linear voltage-regulating circuit |
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| CN102591393A (en) * | 2012-02-24 | 2012-07-18 | 电子科技大学 | Low-dropout linear regulator |
| CN103389769A (en) * | 2013-07-24 | 2013-11-13 | 东南大学 | Band-gap reference voltage source with high power supply rejection ratio |
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| US20160308497A1 (en) * | 2015-04-20 | 2016-10-20 | Freescale Semiconductor, Inc. | Low drop out voltage regulator and method therefor |
| CN106055012A (en) * | 2016-07-15 | 2016-10-26 | 上海璜域光电科技有限公司 | High-speed LDO (Low Dropout Regulator) circuit capable of increasing power supply rejection ratio |
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Patent Citations (7)
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| CN102591393A (en) * | 2012-02-24 | 2012-07-18 | 电子科技大学 | Low-dropout linear regulator |
| CN103389769A (en) * | 2013-07-24 | 2013-11-13 | 东南大学 | Band-gap reference voltage source with high power supply rejection ratio |
| CN104391533A (en) * | 2014-11-12 | 2015-03-04 | 记忆科技(深圳)有限公司 | High-PSRR (power supply rejection ratio) LDO (low dropout regulator) circuit |
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| CN106055012A (en) * | 2016-07-15 | 2016-10-26 | 上海璜域光电科技有限公司 | High-speed LDO (Low Dropout Regulator) circuit capable of increasing power supply rejection ratio |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149962A (en) * | 2018-09-03 | 2019-01-04 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Method and apparatus based on voltage reference signal compensating direct current power supply system stability |
| CN109240401A (en) * | 2018-09-05 | 2019-01-18 | 光梓信息科技（上海）有限公司 | Low-dropout linear voltage-regulating circuit |
| CN109240401B (en) * | 2018-09-05 | 2020-10-27 | 光梓信息科技（上海）有限公司 | Low dropout linear voltage stabilizing circuit |
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| CB02 | Change of applicant information |
Address after: 100083 18 floor, West Tower, block D, Tongfang science and Technology Plaza, 1 Wang Zhuang Road, Wudaokou, Haidian District, Beijing. Applicant after: Purple light co core Microelectronics Co., Ltd. Address before: 100083 18 floor, West Tower, block D, Tongfang science and Technology Plaza, 1 Wang Zhuang Road, Wudaokou, Haidian District, Beijing. Applicant before: Beijing Tongfang Microelectronics Company |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180629 |