CN104317345A - Low dropout regulator on basis of active feedback network - Google Patents
Low dropout regulator on basis of active feedback network Download PDFInfo
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- CN104317345A CN104317345A CN201410585078.4A CN201410585078A CN104317345A CN 104317345 A CN104317345 A CN 104317345A CN 201410585078 A CN201410585078 A CN 201410585078A CN 104317345 A CN104317345 A CN 104317345A
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Abstract
The invention discloses a low dropout regulator on the basis of the active feedback network. The low dropout regulator comprises an error amplifier, an MOS (metal oxide semiconductor) M1, an MOS M2 and the active feedback network, an inverted input end of the error amplifier is connected with a reference voltage module, a non-inverting input end is connected with an output port of the regulator via the active feedback network, an electrode 0 of the error amplifier is connected with a drain of the MOS M2, a source of the MOS M2 is connected with the ground, and a grid of the MOS M2 is connected with bias voltage VBIAS. The low dropout regulator on the basis of the active feedback network can supply required voltage for chips, occupation area of the chips is effectively reduced, and cost is reduced as well.
Description
Technical field
The invention belongs to integrated circuit (IC) design field, and be more particularly to low pressure difference linear voltage regulator design.
Background technology
Low pressure difference linear voltage regulator (Low Dropout Regulator, LDO) in power management chip, there is low ripple, low output noise, fast response time, integrated level advantages of higher, obtain in portable electric pipeline equipment and apply more and more widely, the equipment such as such as mobile phone, bluetooth, wireless network, PDA, particularly output voltage precision, applied environment that accuracy requirement is higher are being had broad application prospects.
In prior art, as shown in Figure 1, its basic structure comprises band-gap reference circuit to LDO, error amplifier, adjustment PMOS, resistor voltage divider network.The principle of work of LDO linear voltage regulator is the output current of the negative feedback Modulating Power pipe by operational amplifier, thus makes output voltage keep stable.The reference voltage VREF that inverting input and the band-gap reference of error amplifier provide is connected, and the input end in the same way of error amplifier is connected after electric resistance partial pressure with the output voltage VO UT of LDO.When input voltage increases, the output current being in the power tube of saturation region increases, and makes output voltage VO UT also increase simultaneously.The output voltage increased is after electric resistance partial pressure, and the voltage feeding back to the input end in the same way of error amplifier increases, and the output of amplifier is increased, and power tube grid voltage increases, and has dragged down the output current of power tube, thus regulated output voltage.In like manner, when input voltage reduces, also control by feedback loop, reduce the grid voltage of power consumption pipe, output current is reduced, thus realize the stable of output voltage.As we can see from the figure, because degenerative error amplification input terminal voltage is equal, output voltage is VOUT=VREF(1+R2/R1).
Miniaturization and cost minimization are the important research directions of LDO linear voltage regulator, are also its development trends.In the prior art, chip cost is reduced for reduction chip area and also has no small research space, propose a kind of low pressure difference linear voltage regulator based on active feedback real-time performance in the present invention, effectively can reduce area and reduce costs, the stability of AC loop can also be increased simultaneously.
Summary of the invention
In view of LDO linear voltage regulator is to the demand of miniaturization low cost, the invention provides a kind of low differential voltage linear voltage stabilizer circuit based on active feedback real-time performance.
Above-mentioned purpose of the present invention, will be achieved by the following technical programs:
A kind of low pressure difference linear voltage regulator based on active feedback real-time performance comprises error amplifier, metal-oxide-semiconductor M1, metal-oxide-semiconductor M2 and active feedback network; The inverting input of described error amplifier is connected with reference voltage module, and in-phase input end is connected to the output port of voltage stabilizer by active feedback network, and the output terminal of error amplifier is connected with the grid of metal-oxide-semiconductor; The source electrode of described metal-oxide-semiconductor M1 is connected to power supply, and the drain electrode of metal-oxide-semiconductor M1 is connected to the drain electrode of metal-oxide-semiconductor M2, and the source electrode of metal-oxide-semiconductor M2 is connected to the ground and connects, and the grid of metal-oxide-semiconductor M2 is connected with bias voltage VBIAS.
Further, described low pressure difference linear voltage regulator, is characterized in that, described active feedback network comprises metal-oxide-semiconductor M3 and metal-oxide-semiconductor M4; The source electrode of described metal-oxide-semiconductor M3 connects power supply, and the grid of metal-oxide-semiconductor M3 is connected to output end of voltage stabilizer VOUT, and the drain electrode of metal-oxide-semiconductor M3 is connected to the in-phase input end of error amplifier; The drain electrode of described metal-oxide-semiconductor M4 is connected to the in-phase input end of error amplifier, and the grid of metal-oxide-semiconductor M4 is connected to bias voltage VBIAS2, the source ground of metal-oxide-semiconductor M4.
Further, described active feedback network, is characterized in that, described metal-oxide-semiconductor M3 is NMOS tube, and described metal-oxide-semiconductor M4 is NMOS tube.
Further, described low pressure difference linear voltage regulator, is characterized in that, described metal-oxide-semiconductor M1 is PMOS, and described metal-oxide-semiconductor M2 is NMOS tube.
The technical scheme beneficial effect provided of the present invention is: a kind of low pressure difference linear voltage regulator based on active feedback real-time performance provided by the present invention, owing to adopting active feedback network, the output voltage of LDO is effectively fed back to error amplifier input end in the same way, make LDO stable output; The feedback network adopting active device to realize effectively reduces LDO chip area, reduces costs; In addition, because the input end of active feedback network to output node and error amplifier introduced in AC loop is isolated, improve the stability of loop.
Below just accompanying drawing in conjunction with the embodiments, is further described the embodiment of technical scheme provided by the invention, to make the present invention be easier to understand, implement.
Accompanying drawing explanation
The LDO structure of Fig. 1 prior art;
The LDO structural representation that Fig. 2 the present invention proposes;
The LDO circuit theory diagrams that Fig. 3 the present invention proposes.
Embodiment
Embodiment will be described spirit of the present invention further, this illustrative examples of the present invention and illustrate for explaining the present invention, but can not limitation of the invention be thought.
As shown in Figure 3, be a kind of embodiment of the low pressure difference linear voltage regulator based on active feedback real-time performance that the present invention proposes.Wherein VREF module produces the voltage of zero-temperature coefficient by band gap and provides required reference voltage through amplifier ratio circuit to error amplifier.The output of VREF module is connected with the inverting input of error amplifier.The in-phase input end that error is amplified is connected to the output port VOUT of LDO linear voltage regulator by active feedback network.The output of error amplifier is connected to power tube---PMOS M1.By the degeneration factor that error amplifier and active feedback network form, the output of amplifier can be adjusted, control the grid voltage of power tube, make output voltage remain very fixed.The source electrode of power tube PMOS M1 connects the power supply of input, and grid connects the output terminal of error amplifier, and drain electrode connects the output terminal VOUT of LDO linear voltage regulator.NMOS tube M2 drain electrode connects LDO output terminal VOUT, source ground, and grid meets a bias-voltage VBIAS1, and NMOS tube M2 provides bias current for power tube M1, is also the load that current source makes PMOS M1 simultaneously.
In a kind of example of the low pressure difference linear voltage regulator based on active feedback real-time performance, the active feedback network adopted comprises NMOS tube M3 and NMOS tube M4; The drain electrode of described NMOS tube M3 connects power supply, and the grid of metal-oxide-semiconductor M3 is connected to output end of voltage stabilizer VOUT, and the source electrode of NMOS tube M3 is connected to the in-phase input end of error amplifier; The drain electrode of described NMOS tube M4 is connected to the in-phase input end of error amplifier, and the grid of NMOS tube M4 is connected to bias voltage VBIAS2, the source ground of NMOS tube M4.Output voltage is fed back to the in-phase input end of error amplifier here by the mode that source is followed.
Be V according to the size of output voltage in instances
oUT=V
rEF+ V
gS, by reference voltage V reasonable in design
rEF, and regulate V by the breadth length ratio of NMOS tube M3
gS, make the output voltage V obtaining needing
oUT.
A kind of low pressure difference linear voltage regulator based on active feedback real-time performance of the present invention's design, adopts and has feedback network can realize the stable output of LDO linear voltage regulator, effectively reduce LDO microarray biochip, reduce costs, increase loop stability simultaneously.By instructions of the present invention as herein described and embodiment, those skilled in the art can understand other aspects and embodiment easily.
For those skilled in the art, under the premise without departing from the principles of the invention, can also make various concrete distortion and combination, these distortion and combination also should be considered as protection scope of the present invention.
Claims (4)
1. the low pressure difference linear voltage regulator based on active feedback real-time performance comprises error amplifier, metal-oxide-semiconductor M1, metal-oxide-semiconductor M2 and active feedback network; The inverting input of described error amplifier is connected with reference voltage module, and in-phase input end is connected to the output port of voltage stabilizer by active feedback network, and the output terminal of error amplifier is connected with the grid of metal-oxide-semiconductor; The source electrode of described metal-oxide-semiconductor M1 is connected to power supply, and the drain electrode of metal-oxide-semiconductor M1 is connected to the drain electrode of metal-oxide-semiconductor M2, and the source electrode of metal-oxide-semiconductor M2 is connected to the ground and connects, and the grid of metal-oxide-semiconductor M2 is connected with bias voltage VBIAS.
2. low pressure difference linear voltage regulator according to claim 1, is characterized in that, described active feedback network comprises metal-oxide-semiconductor M3 and metal-oxide-semiconductor M4; The source electrode of described metal-oxide-semiconductor M3 connects power supply, and the grid of metal-oxide-semiconductor M3 is connected to output end of voltage stabilizer VOUT, and the drain electrode of metal-oxide-semiconductor M3 is connected to the in-phase input end of error amplifier; The drain electrode of described metal-oxide-semiconductor M4 is connected to the in-phase input end of error amplifier, and the grid of metal-oxide-semiconductor M4 is connected to bias voltage VBIAS2, the source ground of metal-oxide-semiconductor M4.
3. active feedback network according to claim 2, is characterized in that, described metal-oxide-semiconductor M3 is NMOS tube, and described metal-oxide-semiconductor M4 is NMOS tube.
4. low pressure difference linear voltage regulator according to claim 1, is characterized in that, described metal-oxide-semiconductor M1 is PMOS, and described metal-oxide-semiconductor M2 is NMOS tube.
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Cited By (5)
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|---|---|---|---|---|
| CN108021169A (en) * | 2016-11-02 | 2018-05-11 | 中国科学院沈阳自动化研究所 | A kind of LDO circuit |
| CN111273720A (en) * | 2020-03-04 | 2020-06-12 | 中国电子科技集团公司第二十四研究所 | Compensation zero generation circuit for linear voltage regulator |
| CN111367347A (en) * | 2020-05-26 | 2020-07-03 | 江苏长晶科技有限公司 | Line loss compensation method and circuit of linear voltage stabilizer |
| CN111542797A (en) * | 2017-12-18 | 2020-08-14 | 苹果公司 | Double-loop self-adaptive LDO (low dropout regulator) |
| CN114879796A (en) * | 2022-06-24 | 2022-08-09 | 北京芯格诺微电子有限公司 | Digital-analog mixed low dropout linear voltage regulator capable of realizing output voltage regulation |
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| CN102981543A (en) * | 2012-11-19 | 2013-03-20 | 西安三馀半导体有限公司 | Drive circuit of ultralow-power-consumption linear voltage stabilizer |
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| US20050195003A1 (en) * | 2004-03-05 | 2005-09-08 | Soe Zaw M. | Charge pump circuit using active feedback controlled current sources |
| US7724075B2 (en) * | 2006-12-06 | 2010-05-25 | Spansion Llc | Method to provide a higher reference voltage at a lower power supply in flash memory devices |
| US8026703B1 (en) * | 2006-12-08 | 2011-09-27 | Cypress Semiconductor Corporation | Voltage regulator and method having reduced wakeup-time and increased power efficiency |
| CN101419479A (en) * | 2008-12-10 | 2009-04-29 | 武汉大学 | Low-voltage difference linear constant voltage regulator with novel structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108021169A (en) * | 2016-11-02 | 2018-05-11 | 中国科学院沈阳自动化研究所 | A kind of LDO circuit |
| CN111542797A (en) * | 2017-12-18 | 2020-08-14 | 苹果公司 | Double-loop self-adaptive LDO (low dropout regulator) |
| CN111273720A (en) * | 2020-03-04 | 2020-06-12 | 中国电子科技集团公司第二十四研究所 | Compensation zero generation circuit for linear voltage regulator |
| CN111273720B (en) * | 2020-03-04 | 2022-02-22 | 中国电子科技集团公司第二十四研究所 | Compensation zero generation circuit for linear voltage regulator |
| CN111367347A (en) * | 2020-05-26 | 2020-07-03 | 江苏长晶科技有限公司 | Line loss compensation method and circuit of linear voltage stabilizer |
| CN111367347B (en) * | 2020-05-26 | 2020-09-15 | 江苏长晶科技有限公司 | Line loss compensation method and circuit of linear voltage stabilizer |
| CN114879796A (en) * | 2022-06-24 | 2022-08-09 | 北京芯格诺微电子有限公司 | Digital-analog mixed low dropout linear voltage regulator capable of realizing output voltage regulation |
| CN114879796B (en) * | 2022-06-24 | 2022-10-21 | 北京芯格诺微电子有限公司 | Digital-analog mixed low dropout linear voltage regulator capable of realizing output voltage regulation |
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Application publication date: 20150128 |