CN105807830A - System for reducing crosstalk of linear voltage regulators - Google Patents
System for reducing crosstalk of linear voltage regulators Download PDFInfo
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- CN105807830A CN105807830A CN201410844397.2A CN201410844397A CN105807830A CN 105807830 A CN105807830 A CN 105807830A CN 201410844397 A CN201410844397 A CN 201410844397A CN 105807830 A CN105807830 A CN 105807830A
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Abstract
The invention relates to the technical field of electron communication, in particular to a power managing system. A system for reducing the crosstalk of linear voltage regulators is a system which is applied to supplying power for a same power supply chip. The system comprises the first linear voltage regulator for supplying power to a set function module under the effect of a first control signal and adjusting the working state under the effect of a driving signal under a set condition, the second linear voltage regulator for supplying power to the set function module under the effect of a second control signal and meanwhile producing the driving signal, and a control unit for producing the first control signal and the second control signal, wherein the second control signal is delayed by a set period of time compared with the first control signal. By producing the driving signal through the second linear voltage regulator, the bias current of a whole circuit of the first linear voltage regulator is doubled under the driving signal when the second linear voltage regulator is started, the gain of an operational amplifying unit is increased, the power supply rejection ratio is increased, and the crosstalk between the linear voltage regulators is reduced.
Description
Technical field
The present invention relates to technical field of electronic communication, be specifically related to a kind of power-supply management system.
Background technology
Portable set generally arranges multiple low pressure difference linear voltage regulator to meet the need for electricity of multiple functional unit such as audio frequency, illumination, communication etc., multiple low pressure difference linear voltage regulator is connected respectively to realize the power management of portable set by a power supply chip, but in prior art, as depicted in figs. 1 and 2, when the low pressure difference linear voltage regulator being connected to same power supply chip is opened, the low pressure difference linear voltage regulator worked can be produced interference, have influence on the normal operation of system.
Summary of the invention
It is an object of the invention to, it is provided that a kind of system reducing linear voltage regulator crosstalk, solve above technical problem；
Technical problem solved by the invention can realize by the following technical solutions:
A kind of system reducing linear voltage regulator crosstalk, is applied to the system that same power supply chip is powered, wherein, including,
One first linear voltage regulator, is connected with described power supply chip, is set-up function module for power supply under the effect of one first control signal, and drives the effect of signal to lower full employment state in imposing a condition down in one；
One second linear voltage regulator, is connected with described power supply chip, is set-up function module for power supply, produces described driving signal simultaneously under the effect of one second control signal；
One control unit, is connected with described first linear voltage regulator and described second linear voltage regulator respectively, is used for producing described first control signal and described second control signal, and described second control signal compares described first control signal the delay of a setting time.
The system reducing linear voltage regulator crosstalk of the present invention, described first linear voltage regulator and/or described second linear voltage regulator include operation amplifier unit, and described operation amplifier unit includes,
One Differential Input unit；Connect a first input end and one second input, for extracting the differential signal of described first input end and described second input；
One first bias current unit, is connected between a running voltage end and described Differential Input unit, including,
First PMOS, is connected between a running voltage and described Differential Input unit, turns on to produce the first bias current under the effect of one first bias voltage；
Second PMOS, is parallel to the two ends of described first PMOS, under the effect of described driving signal, selectively works asynchronously with described first PMOS, to increase the size of described first bias current.
The system reducing linear voltage regulator crosstalk of the present invention, described Differential Input unit includes,
3rd PMOS, its grid connects first input end, and source electrode is connected with the drain electrode of described first PMOS；
4th PMOS, its grid connects the second input, and source electrode is connected with the source electrode of described 3rd PMOS.
The system reducing linear voltage regulator crosstalk of the present invention, described operation amplifier unit includes,
Second bias current unit, is connected between described Differential Input unit and power supply ground, including,
First NMOS tube, its drain electrode is connected with the drain electrode of described 3rd PMOS, and source electrode connects power supply ground, turns on to produce the second bias current under the effect of one second bias voltage；
Second NMOS tube, is parallel to the two ends of described first NMOS tube, under the effect of described driving signal, selectively works asynchronously with described first NMOS tube, to increase the size of described second bias current.
The system reducing linear voltage regulator crosstalk of the present invention, described second bias current unit, described second bias current unit also includes,
3rd NMOS tube, its drain electrode is connected with the drain electrode of described 4th PMOS, and source electrode connects power supply ground, turns on to produce the second bias current under the effect of described second bias voltage；
4th NMOS tube, is parallel to the two ends of described 3rd NMOS tube, under the effect of described driving signal, selectively works asynchronously with described 3rd NMOS tube, to increase the size of described second bias current.
The system reducing linear voltage regulator crosstalk of the present invention, described power supply chip adopts BUCK chip.
The system reducing linear voltage regulator crosstalk of the present invention, described operation amplifier unit adopts the cascode structure of Differential Input Single-end output.
The present invention also provides for a kind of portable set, including the above-mentioned system reducing linear voltage regulator crosstalk.
Beneficial effect: owing to adopting above technical scheme, the present invention produces a driving signal S21 by the second linear voltage regulator, while second linear voltage regulator is opened, first linear voltage regulator strengthens in the effect below-center offset electric current driving signal S21, the bias current making whole circuit doubles, thus increasing the gain of operation amplifier unit, improving PSRR, reducing the crosstalk between linear voltage regulator.
Accompanying drawing explanation
Fig. 1 is the system structure schematic diagram of prior art；
Fig. 2 is control signal and the output voltage waveform of prior art；
Fig. 3 is the system structure schematic diagram of the present 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.
Detailed description of the invention
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 clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.
It should be noted that when not conflicting, the embodiment in the present invention and the feature in embodiment can be mutually combined.
Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 3, Fig. 4, a kind of system reducing linear voltage regulator crosstalk, it is applied to the system of same power supply chip 1 power supply, wherein, including,
One first linear voltage regulator 2, is connected with power supply chip 1, is set-up function module for power supply under the effect of one first control signal S1, and drives the effect of signal S21 to lower full employment state in imposing a condition down in one；
One second linear voltage regulator 3, is connected with power supply chip 1, is set-up function module for power supply under the effect of one second control signal S2, produces to drive signal simultaneously；
One control unit 4, is connected with the first linear voltage regulator 2 and the second linear voltage regulator 3 respectively, is used for producing the first control signal S1 and the second control signal S2, the second control signal S2 and compares the first control signal S1 and have the delay of a setting time.
In prior art, first linear voltage regulator 2 is opened in advance under the effect of one first control signal S1, when the second linear voltage regulator 3 postpones to open under the second control signal S2 effect of the signal of the first control signal S1 in one, it is easy to the first linear voltage regulator 2 is produced impact.The present invention produces to drive signal S21 by the second linear voltage regulator 3, while second linear voltage regulator 3 is opened, first linear voltage regulator 2 strengthens in the effect below-center offset electric current driving signal, the bias current making whole circuit doubles, increase the gain of operation amplifier unit, improve PSRR, reduce the crosstalk between LDO.
The system reducing linear voltage regulator crosstalk of the present invention, the first linear voltage regulator 2 and/or the second linear voltage regulator 3 include operation amplifier unit, and operation amplifier unit includes,
One Differential Input unit；Connect a first input end and one second input, for extracting first input end and the differential signal of the second input；
One first bias current unit, is connected between a running voltage end VDD and Differential Input unit, including,
First PMOS M11, is connected between a running voltage VDD and Differential Input unit, turns on to produce the first bias current under the effect of one first bias voltage Vb5；
Second PMOS M12, is parallel to the two ends of the first PMOS M11, under the effect driving signal S21, selectively works asynchronously with the first PMOS M11, to increase the size of the first bias current.
Second PMOS M12 and the first PMOS M11 conducting of the present invention, as input drive signal S21, works asynchronously with the first PMOS M11, strengthens bias current.
The system reducing linear voltage regulator crosstalk of the present invention, Differential Input unit can include,
3rd PMOS M1, its grid connects first input end, and the drain electrode of source electrode and the first PMOS M11 connects；
4th PMOS M2, its grid connects the second input, and the source electrode of source electrode and the 3rd PMOS connects.
The system reducing 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 drain electrode of the 3rd PMOS M1, and source electrode connects power supply ground, turns on to produce the second bias current under the effect of one second bias voltage Vb4；
Second NMOS tube M13, is parallel to the two ends of the first NMOS tube M5, under the effect driving signal S21, selectively works asynchronously with the first NMOS tube M5, to increase the size of the second bias current.
The system reducing 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 drain electrode of the 4th PMOS M2, and source electrode connects power supply ground, turns on to produce the second bias current under the effect of the second bias voltage Vb4；
4th NMOS tube M14, is parallel to the two ends of the 3rd NMOS tube M6, under the effect driving signal S21, selectively works asynchronously with the 3rd NMOS tube, to increase the size of the second bias current.
With reference to shown in Fig. 5, adopt technical scheme so that the second linear voltage regulator 3, while the second control signal S2 opens, produces to drive signal S21, bias current Iea increases under the effect driving signal S21 so that the impact of the first linear voltage regulator 2 is little as far as possible.
The system reducing linear voltage regulator crosstalk of the present invention, operation amplifier unit adopts the cascode structure of Differential Input Single-end output.The output stage of the operation amplifier unit of the present invention and amplifier stage can adopt the circuit realiration of prior art, and therefore not to repeat here.
The system reducing linear voltage regulator crosstalk of the present invention, power supply chip 1 can adopt BUCK chip, to provide the running voltage VDD of linear voltage regulator job demand.
The present invention also provides for a kind of portable set, including the above-mentioned system reducing linear voltage regulator crosstalk.Each linear voltage regulator can give the functional unit of portable set respectively, as provided the running voltage of each functional units such as audio frequency, illumination, communication, equipment control respectively, needs along with expanding of system function, power to other various options, such as camera model, bluetooth, WiFi and other link block.
The foregoing is only preferred embodiment of the present invention; not thereby restriction embodiments of the present invention and protection domain; to those skilled in the art; the equivalent replacement done by all utilizations description of the present invention and diagramatic content and the obtained scheme of apparent change should be can appreciate that, all should be included in protection scope of the present invention.
Claims (8)
1. reduce a system for linear voltage regulator crosstalk, be applied to the system that same power supply chip is powered,
It is characterized in that, including,
One first linear voltage regulator, is connected with described power supply chip, is set-up function module for power supply under the effect of one first control signal, and drives the effect of signal to lower full employment state in imposing a condition down in one；
One second linear voltage regulator, is connected with described power supply chip, is set-up function module for power supply, produces described driving signal simultaneously under the effect of one second control signal；
One control unit, is connected with described first linear voltage regulator and described second linear voltage regulator respectively, is used for producing described first control signal and described second control signal, and described second control signal compares described first control signal the delay of a setting time.
2. a kind of system reducing linear voltage regulator crosstalk according to claim 1, it is characterised in that described first linear voltage regulator and/or described second linear voltage regulator include operation amplifier unit, and described operation amplifier unit includes,
One Differential Input unit；Connect a first input end and one second input, for extracting the differential signal of described first input end and described second input；
One first bias current unit, is connected between a running voltage end and described Differential Input unit, including,
First PMOS, is connected between a running voltage and described Differential Input unit, turns on to produce the first bias current under the effect of one first bias voltage；
Second PMOS, is parallel to the two ends of described first PMOS, under the effect of described driving signal, selectively works asynchronously with described first PMOS, to increase the size of described first bias current.
3. a kind of system reducing linear voltage regulator crosstalk according to claim 2, it is characterised in that described Differential Input unit includes,
3rd PMOS, its grid connects first input end, and source electrode is connected with the drain electrode of described first PMOS；
4th PMOS, its grid connects the second input, and source electrode is connected with the source electrode of described 3rd PMOS.
4. a kind of system reducing linear voltage regulator crosstalk according to claim 2, it is characterised in that described operation amplifier unit includes,
Second bias current unit, is connected between described Differential Input unit and power supply ground, including,
First NMOS tube, its drain electrode is connected with the drain electrode of described 3rd PMOS, and source electrode connects power supply ground, turns on to produce the second bias current under the effect of one second bias voltage；
Second NMOS tube, is parallel to the two ends of described first NMOS tube, under the effect of described driving signal, selectively works asynchronously with described first NMOS tube, to increase the size of described second bias current.
5. a kind of system reducing linear voltage regulator crosstalk according to claim 4, it is characterised in that described second bias current unit also includes,
3rd NMOS tube, its drain electrode is connected with the drain electrode of described 4th PMOS, and source electrode connects power supply ground, turns on to produce the second bias current under the effect of described second bias voltage；
4th NMOS tube, is parallel to the two ends of described 3rd NMOS tube, under the effect of described driving signal, selectively works asynchronously with described 3rd NMOS tube, to increase the size of described second bias current.
6. a kind of system reducing linear voltage regulator crosstalk according to claim 1, it is characterised in that described power supply chip adopts BUCK chip.
7. a kind of system reducing linear voltage regulator crosstalk according to claim 1, it is characterised in that described operation amplifier unit adopts the cascode structure of Differential Input Single-end output.
8. a portable set, it is characterised in that include the system reducing linear voltage regulator crosstalk described in claim 1 to 7 any one.
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| CN201410844397.2A CN105807830B (en) | 2014-12-30 | 2014-12-30 | A kind of system for reducing linear voltage regulator crosstalk |
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| CN201410844397.2A CN105807830B (en) | 2014-12-30 | 2014-12-30 | A kind of system for reducing linear voltage regulator crosstalk |
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| CN105807830A true CN105807830A (en) | 2016-07-27 |
| CN105807830B CN105807830B (en) | 2017-08-04 |
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| 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 |
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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)
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