CN105807830B - A kind of system for reducing linear voltage regulator crosstalk - Google Patents
A kind of system for reducing linear voltage regulator crosstalk Download PDFInfo
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- CN105807830B CN105807830B CN201410844397.2A CN201410844397A CN105807830B CN 105807830 B CN105807830 B CN 105807830B CN 201410844397 A CN201410844397 A CN 201410844397A CN 105807830 B CN105807830 B CN 105807830B
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Abstract
The present invention relates to technical field of electronic communication, and in particular to a kind of power-supply management system.A kind of system for reducing linear voltage regulator crosstalk, the system powered applied to same power supply chip, including, one first linear voltage regulator, it is set-up function module for power supply in the presence of one first control signal, and working condition is adjusted in the presence of a drive signal in imposing a condition down；One second linear voltage regulator, is set-up function module for power supply in the presence of one second control signal, while producing drive signal；Control unit, for producing the first control signal and the second control signal, the second control signal has the delay of a setting time compared to the first control signal.The present invention produces a drive signal by the second linear voltage regulator, so that while the unlatching of the second linear voltage regulator, first linear voltage regulator bias current of whole circuit in the presence of drive signal is doubled, so as to increase the gain of operation amplifier unit, improve PSRR, reduce the crosstalk between linear voltage regulator.
Description
Technical field
The present invention relates to technical field of electronic communication, and in particular to a kind of power-supply management system.
Background technology
Multiple low pressure difference linear voltage regulators are generally set in portable set to meet multiple functional units such as audio, photograph
The need for electricity of bright, communication etc., connects multiple low pressure difference linear voltage regulators to realize portable set respectively by a power supply chip
Standby power management, but in the prior art, as depicted in figs. 1 and 2, when a low voltage difference line for being connected to same power supply chip
Property voltage-stablizer when opening, interference can be produced to the low pressure difference linear voltage regulator that is working, the normal work of system is had influence on.
The content of the invention
It is an object of the present invention to provide a kind of system for reducing linear voltage regulator crosstalk, solves above technical problem；
Technical problem solved by the invention can be realized using following technical scheme：
A kind of system for reducing linear voltage regulator crosstalk, the system powered applied to same power supply chip, wherein, including,
One first linear voltage regulator, is connected with the power supply chip, is setting work(in the presence of one first control signal
Energy module for power supply, and adjust working condition in the presence of a drive signal in imposing a condition down；
One second linear voltage regulator, is connected with the power supply chip, is setting work(in the presence of one second control signal
Energy module for power supply, while producing the drive signal；
One control unit, is connected with first linear voltage regulator and second linear voltage regulator, for producing respectively
First control signal and second control signal, second control signal have one to set compared to first control signal
The delay fixed time.
The system of the reduction linear voltage regulator crosstalk of the present invention, first linear voltage regulator and/or described second linear
Voltage-stablizer includes operation amplifier unit, and the operation amplifier unit includes,
One Differential Input unit；A first input end and one second input are connected, for extracting the first input end
With the differential signal of second input；
One first bias current unit, is connected between an operating voltage end and the Differential Input unit, including,
First PMOS, is connected between an operating voltage and the Differential Input unit, in one first bias voltage
Effect is lower to be turned on to produce the first bias current；
Second PMOS, is parallel to the two ends of first PMOS, in the presence of the drive signal, selectively
Worked asynchronously with first PMOS, to increase the size of first bias current.
The system of the reduction linear voltage regulator crosstalk of the present invention, the Differential Input unit includes,
3rd PMOS, its grid connection first input end, source electrode is connected with the drain electrode of first PMOS；
4th PMOS, its grid connects the second input, and source electrode is connected with the source electrode of the 3rd PMOS.
The system of the reduction linear voltage regulator crosstalk of the present invention, the operation amplifier unit includes,
Second bias current unit, is connected between the Differential Input unit and power supply ground, including,
First NMOS tube, its drain electrode is connected with the drain electrode of the 3rd PMOS, source electrode connection power supply, it is inclined in one second
Put and turn on to produce the second bias current in the presence of voltage；
Second NMOS tube, is parallel to the two ends of first NMOS tube, in the presence of the drive signal, selectively
Worked asynchronously with first NMOS tube, to increase the size of second bias current.
The system of the reduction linear voltage regulator crosstalk of the present invention, the second bias current unit, second biased electrical
Stream unit also includes,
3rd NMOS tube, its drain electrode is connected with the drain electrode of the 4th PMOS, source electrode connection power supply, in described second
Turn on to produce the second bias current in the presence of bias voltage；
4th NMOS tube, is parallel to the two ends of the 3rd NMOS tube, in the presence of the drive signal, selectively
Worked asynchronously with the 3rd NMOS tube, to increase the size of second bias current.
The system of the reduction linear voltage regulator crosstalk of the present invention, the power supply chip uses BUCK chips.
The system of the reduction linear voltage regulator crosstalk of the present invention, the operation amplifier unit uses Differential Input Single-end output
Cascode structure.
The present invention also provides a kind of portable set, includes the system of above-mentioned reduction linear voltage regulator crosstalk.
Beneficial effect：Due to using above technical scheme, the present invention produces a drive signal by the second linear voltage regulator
S21 so that while the second linear voltage regulator is opened, the first linear voltage regulator bias current in the presence of drive signal S21
Increase so that the bias current of whole circuit is doubled, so as to increase the gain of operation amplifier unit, improve PSRR, subtract
Crosstalk between small linear voltage regulator.
Brief description of the drawings
Fig. 1 is the system structure diagram of prior art；
Fig. 2 is the control signal and output voltage waveform of prior art；
Fig. 3 is system structure diagram of the invention；
Fig. 4 is the circuit diagram of the operation amplifier unit of the present invention；
Fig. 5 is the oscillogram of the coherent signal of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combination.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
Reference picture 3, Fig. 4, a kind of system of reduction linear voltage regulator crosstalk, be applied to what same power supply chip 1 was powered
System, wherein, including,
One first linear voltage regulator 2, is connected with power supply chip 1, is setting work(in the presence of one first control signal S1
Energy module for power supply, and adjust working condition in the presence of a drive signal S21 in imposing a condition down；
One second linear voltage regulator 3, is connected with power supply chip 1, is setting work(in the presence of one second control signal S2
Energy module for power supply, while producing drive signal；
One control unit 4, is connected with the first linear voltage regulator 2 and the second linear voltage regulator 3 respectively, is controlled for producing first
Signal S1 processed and the second control signal S2, the second control signal S2 have the delay of a setting time compared to the first control signal S1.
In the prior art, the first linear voltage regulator 2 is opened in advance in the presence of one first control signal S1, when the second line
Property voltage-stablizer 3 when one postpones that the second control signal S2 effects in the first control signal S1 signal are lower to open, it is easy to the
One linear voltage regulator 2 produces influence.The present invention is produced with drive signal S21 by the second linear voltage regulator 3 so that second is linear
While voltage-stablizer 3 is opened, the first linear voltage regulator 2 bias current in the presence of drive signal is increased so that whole circuit
Bias current double, increase operation amplifier unit gain, improve PSRR, reduce LDO between crosstalk.
The system of the reduction linear voltage regulator crosstalk of the present invention, the first linear voltage regulator 2 and/or the second linear voltage regulator 3
Including operation amplifier unit, operation amplifier unit includes,
One Differential Input unit；A first input end and one second input are connected, for extracting first input end and
The differential signal of two inputs；
One first bias current unit, is connected between an operating voltage end VDD and Differential Input unit, including,
First PMOS M11, is connected between an operating voltage VDD and Differential Input unit, in one first bias voltage
Turn on to produce the first bias current in the presence of Vb5；
Second PMOS M12, is parallel to the first PMOS M11 two ends, in the presence of drive signal S21, may be selected
Ground works asynchronously with the first PMOS M11, to increase the size of the first bias current.
The the second PMOS M12 and the first PMOS M11 of the present invention is turned on, as input drive signal S21, with first
PMOS M11 works asynchronously, and increases bias current.
The system of the reduction linear voltage regulator crosstalk of the present invention, Differential Input unit can include,
3rd PMOS M1, its grid connection first input end, source electrode is connected with the first PMOS M11 drain electrode；
4th PMOS M2, its grid connects the second input, and source electrode is connected with the source electrode of the 3rd PMOS.
The system of the reduction linear voltage regulator crosstalk of the present invention, operation amplifier unit can include,
Second bias current unit, is connected between Differential Input unit and power supply ground, including,
First NMOS tube M5, its drain electrode is connected with the 3rd PMOS M1 drain electrode, source electrode connection power supply, it is inclined in one second
Put and turn on to produce the second bias current in the presence of voltage Vb4；
Second NMOS tube M13, is parallel to the first NMOS tube M5 two ends, in the presence of drive signal S21, selectively
Worked asynchronously with the first NMOS tube M5, to increase the size of the second bias current.
The system of the reduction linear voltage regulator crosstalk of the present invention, the second bias current unit can also include,
3rd NMOS tube M6, its drain electrode is connected with the 4th PMOS M2 drain electrode, source electrode connection power supply, in the second biasing
Turn on to produce the second bias current in the presence of voltage Vb4；
4th NMOS tube M14, is parallel to the 3rd NMOS tube M6 two ends, in the presence of drive signal S21, selectively
Worked asynchronously with the 3rd NMOS tube, to increase the size of the second bias current.
Shown in reference picture 5, using technical scheme so that the second linear voltage regulator 3 is in the second control signal S2
While unlatching, drive signal S21 is produced, bias current Iea increases in the presence of drive signal S21 so as to First Line
The influence of property voltage-stablizer 2 is as small as possible.
The system of the reduction linear voltage regulator crosstalk of the present invention, operation amplifier unit is total to using Differential Input Single-end output
Source common gate structure.The output stage and amplifying stage of the operation amplifier unit of the present invention can use the circuit realiration of prior art,
This is not repeated.
The system of the reduction linear voltage regulator crosstalk of the present invention, power supply chip 1 can use BUCK chips, linear to provide
The operating voltage VDD of voltage-stablizer need of work.
The present invention also provides a kind of portable set, includes the system of above-mentioned reduction linear voltage regulator crosstalk.Each line
Property voltage-stablizer can respectively give portable set functional unit, such as respectively provide audio, illumination, communication, equipment control respectively
The operating voltage of functional unit, with expanding of system function the need for, can also be powered to other various options, such as camera mould
Block, bluetooth, WiFi and other link blocks.
Preferred embodiments of the present invention are the foregoing is only, embodiments of the present invention and protection model is not thereby limited
Enclose, to those skilled in the art, should can appreciate that made by all utilization description of the invention and diagramatic content
Scheme obtained by equivalent substitution and obvious change, should be included in protection scope of the present invention.
Claims (7)
1. a kind of system for reducing linear voltage regulator crosstalk, the system powered applied to same power supply chip, it is characterised in that bag
Include,
One first linear voltage regulator, is connected with the power supply chip, is set-up function mould in the presence of one first control signal
Block is powered, and adjusts working condition in the presence of a drive signal in imposing a condition down；
One second linear voltage regulator, is connected with the power supply chip, is set-up function mould in the presence of one second control signal
Block is powered, while producing the drive signal；
One control unit, is connected with first linear voltage regulator and second linear voltage regulator respectively, described for producing
First control signal and second control signal, when second control signal has a setting compared to first control signal
Between delay；
First linear voltage regulator and/or second linear voltage regulator include operation amplifier unit, the operation amplifier list
Member includes,
One Differential Input unit；A first input end and one second input are connected, for extracting the first input end and institute
State the differential signal of the second input；
One first bias current unit, is connected between an operating voltage end and the Differential Input unit, including,
First PMOS, is connected between an operating voltage and the Differential Input unit, in the effect of one first bias voltage
It is lower to turn on to produce the first bias current；
Second PMOS, is parallel to the two ends of first PMOS, in the presence of the drive signal, selectively with institute
The first PMOS synchronous working is stated, to increase the size of first bias current.
2. a kind of system for reducing linear voltage regulator crosstalk according to claim 1, it is characterised in that the Differential Input
Unit includes,
3rd PMOS, its grid connection first input end, source electrode is connected with the drain electrode of first PMOS；
4th PMOS, its grid connects the second input, and source electrode is connected with the source electrode of the 3rd PMOS.
3. a kind of system for reducing linear voltage regulator crosstalk according to claim 2, it is characterised in that the operation amplifier
Unit includes,
Second bias current unit, is connected between the Differential Input unit and power supply ground, including,
First NMOS tube, its drain electrode is connected with the drain electrode of the 3rd PMOS, source electrode connection power supply, in one second biased electrical
Turn on to produce the second bias current in the presence of pressure；
Second NMOS tube, is parallel to the two ends of first NMOS tube, in the presence of the drive signal, selectively with institute
The first NMOS tube synchronous working is stated, to increase the size of second bias current.
4. a kind of system for reducing linear voltage regulator crosstalk according to claim 3, it is characterised in that second biasing
Current unit also includes,
3rd NMOS tube, its drain electrode is connected with the drain electrode of the 4th PMOS, source electrode connection power supply, in the described second biasing
Turn on to produce the second bias current in the presence of voltage；
4th NMOS tube, is parallel to the two ends of the 3rd NMOS tube, in the presence of the drive signal, selectively with institute
The 3rd NMOS tube synchronous working is stated, to increase the size of second bias current.
5. a kind of system for reducing linear voltage regulator crosstalk according to claim 1, it is characterised in that the power supply chip
Using BUCK chips.
6. a kind of system for reducing linear voltage regulator crosstalk according to claim 1, it is characterised in that the operation amplifier
Unit uses the cascode structure of Differential Input Single-end output.
7. a kind of portable set, it is characterised in that including the reduction linear voltage regulator described in claim 1 to 6 any one
The system of crosstalk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410844397.2A CN105807830B (en) | 2014-12-30 | 2014-12-30 | A kind of system for reducing linear voltage regulator crosstalk |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410844397.2A CN105807830B (en) | 2014-12-30 | 2014-12-30 | A kind of system for reducing linear voltage regulator crosstalk |
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| Publication Number | Publication Date |
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| CN105807830A CN105807830A (en) | 2016-07-27 |
| CN105807830B true CN105807830B (en) | 2017-08-04 |
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Citations (5)
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|---|---|---|---|---|
| US6130526A (en) * | 1999-04-02 | 2000-10-10 | Semtech Corporation | Voltage regulator with wide control bandwidth |
| US6661211B1 (en) * | 2002-06-25 | 2003-12-09 | Alcatel Canada Inc. | Quick-start DC-DC converter circuit and method |
| CN102664519A (en) * | 2012-05-30 | 2012-09-12 | 无锡德思普科技有限公司 | Low-noise wide-range heavy-current battery simulation device |
| CN203027231U (en) * | 2012-11-26 | 2013-06-26 | 西安威正电子科技有限公司 | Circuit for avoiding simultaneous start of parallel LDOs (Low Dropout Regulators) |
| CN103368557A (en) * | 2013-07-12 | 2013-10-23 | 青岛歌尔声学科技有限公司 | Low quiescent current level switching circuit and electronic instrument comprising same |
-
2014
- 2014-12-30 CN CN201410844397.2A patent/CN105807830B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6130526A (en) * | 1999-04-02 | 2000-10-10 | Semtech Corporation | Voltage regulator with wide control bandwidth |
| US6661211B1 (en) * | 2002-06-25 | 2003-12-09 | Alcatel Canada Inc. | Quick-start DC-DC converter circuit and method |
| CN102664519A (en) * | 2012-05-30 | 2012-09-12 | 无锡德思普科技有限公司 | Low-noise wide-range heavy-current battery simulation device |
| CN203027231U (en) * | 2012-11-26 | 2013-06-26 | 西安威正电子科技有限公司 | Circuit for avoiding simultaneous start of parallel LDOs (Low Dropout Regulators) |
| CN103368557A (en) * | 2013-07-12 | 2013-10-23 | 青岛歌尔声学科技有限公司 | Low quiescent current level switching circuit and electronic instrument comprising same |
Non-Patent Citations (1)
| Title |
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| 低压差线性稳压器的使用技巧;沙占友;《电源技术应用》;20080630;第6卷(第11期);第62页及图2 * |
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| CN105807830A (en) | 2016-07-27 |
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