CN1702588A - Voltage regulation apparatus - Google Patents
Voltage regulation apparatus Download PDFInfo
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- CN1702588A CN1702588A CN 200510078646 CN200510078646A CN1702588A CN 1702588 A CN1702588 A CN 1702588A CN 200510078646 CN200510078646 CN 200510078646 CN 200510078646 A CN200510078646 A CN 200510078646A CN 1702588 A CN1702588 A CN 1702588A
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- Prior art keywords
- transistor
- voltage
- resistance
- terminal
- regulating device
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Abstract
This invention discloses a voltage adjusting device, which comprises an operation amplifier including a positive input end, a negative input end and an output end, wherein, the said negative one is connected to a reference voltage; a current mirror including a reference end and a mirror-image end; in addition a first transistor whose grid end is connected with the output end of the amplifier; the source end is connected to the reference end of current mirror, and the drain end is connected to the positive input end of amplifier.
Description
Technical field
The present invention is meant a kind of voltage regulator circuit of adjustable output voltage size especially about a kind of voltage regulator circuit.
Background technology
One voltage regulating device (Power Regulator) is generally according to a reference voltage source (Reference Voltage) and relatively provides power supply output through operational amplifier (Operational Amplifier).See also shown in Figure 1ly, it is the circuit diagram of a voltage regulating device 1 of known technology.Voltage regulating device 1 comprises an operational amplifier 2 its output terminals and connects a PMOS transistor P
1Grid, negative input end connect a reference voltage V
BG, positive input terminal connects a resistance R in Node B, a PMOS transistor P
2Drain electrode be connected in the output terminal and the PMOS transistor P of this operational amplifier
1Grid; PMOS transistor P wherein
1Source electrode connect a voltage source V dd, the drain electrode via Node B series resistor R the earth terminal that arrives, PMOS transistor P
2Be used for the usefulness of (Reset) voltage regulating device circuit of resetting.
When this operational amplifier 2 receives this reference voltage V at its negative input end
BGThe time, it can be with the voltage V of this operational amplifier positive input terminal
A(voltage on the resistance R) is pulled up to and this reference voltage V
BGIdentical, its output end voltage is reduced and and Vdd produce a voltage difference, to drive this PMOS transistor P
1Conducting produces an electric current I
1, and obtain this output voltage V
OUT=I
1* R, the value V of this output voltage again
OUTIdentical with the magnitude of voltage VA of the positive input terminal that inputs to operational amplifier, and VBG=VA, so this output voltage V
OUTWith this reference voltage V
BGIdentical.
In this circuit, use usually and can be with (Band Gap) fixing MOS transistor that this reference voltage V is provided
BG, its advantage is comparatively stable for the power supply that is provided, but big electric current can't be provided; When using large-sized MOS transistor then can provide a bigger electric current, utilize this operational amplifier 2 to do a unity gain buffer (Unit Gain Buffer) again, relatively V in exit point
BGWith V
AMake it in order to the driven MOS transistor, provide an output voltage VO UT, but it finally is restricted to V
BG=V
OUT
See also the circuit diagram that Figure 2 shows that another voltage regulating device 10 of known technology.Voltage regulating device 10 comprises an operational amplifier 12 its output terminals and connects a PMOS transistor P
1Grid, negative input end connect a reference voltage V
BG, positive input terminal connects two resistance R
1, R
2In Node B, a PMOS transistor P
2Drain electrode be connected in the output terminal and the PMOS transistor P of this operational amplifier
1Grid, PMOS transistor P wherein
1The grid output terminal, the source electrode that are connected in this operational amplifier be connected in series a resistance R in regular turn
1With a resistance R
2And the earth terminal that arrives, this resistance R
1With resistance R
2The B of serial connection place couples mutually with the positive input terminal of this operational amplifier again.
When this operational amplifier 12 receives this reference voltage V at its negative input end
BGThe time, it can be with the voltage V of this operational amplifier positive input terminal
ABe pulled up to and this reference voltage V
BGIdentical, make its output terminal be output as zero, to drive this PMOS transistor P
1Conducting produces an electric current I
1, obtain an output voltage V
OUT=I
1* (R
1+ R
2), resistance R again
1, R
2The voltage V at serial connection place
B=I
1* R
2=V
A, and V
AEqual V again
BG, i.e. V
A=V
BG=I
1* R
2, I
1=V
BG/ R
2So, this output voltage V
OUT=I
1* (R
1+ R
2)=V
BG* (R
1+ R
2)/R
2
In this circuit, the output voltage that can effectively solve above-mentioned known technology finally limits V
BG=V
OUTProblem, pass through R
1, R
2The resistance adjustment produces this output voltage V
OUT, but R
1, R
2In order to reach its accuracy, generally the resistance made from polysilicon obtains the resistance combination of preferable ratio, R usually to resistance in chip
1, R
2Resistance can reach about thousands of ohm and R
1Can form a heavy load in negative feedback loop and reduce its loop gain, under the part situation even cause thrashing, because of output terminal can connect many different circuit, can cause changing load and shakiness in the negative feedback loop again, therefore cause the shakiness of system.
Therefore, in the known technology voltage regulating device,, can not increase the situation of the load of its negative feedback loop again, make system more stable, be the problem of our institute's desire improvement for how stable power output can effectively be provided.
Summary of the invention
Therefore the invention provides a kind of voltage regulator circuit, be used to provide a stable output voltage.
The invention provides a kind of voltage regulator circuit, it can regulate output voltage by the width/length degree ratio and the resistance sizes of transistor channel in the current mirror, improves the loop gain of negative feedback loop.
The present invention discloses a kind of voltage regulating device, includes: an operational amplifier has a positive input terminal, a negative input end and an output terminal, and wherein the negative input end of operational amplifier connects a reference voltage V
BGOne current mirror includes a reference edge and a mirror image end, and its reference edge is connected in series a first transistor in regular turn, one first resistance R
1And end with arriving, its mirror image end one second resistance R of connecting
2Extremely hold; The first transistor, the gate terminal of the first transistor is connected with the output terminal of operational amplifier, and source terminal is connected to the reference edge of current mirror, and drain electrode end is connected to the positive input terminal and first resistance R of operational amplifier
1And a transistor seconds, its source electrode connects a voltage source, the output terminal of drain electrode concatenation operation amplifier and the grid of the first transistor.
Therefore, when operational amplifier with the reference voltage and first resistance R
1On voltage ratio after, operational amplifier according to the output of both differences to drive the reference current I that the first transistor produces current mirror
1, and with reference current I
1Be mapped in the mirror image end to obtain an image current I
2, and the voltage regulating device output terminal is the mirror image end and second resistance R of current mirror
2The serial connection place so can obtain a stable output voltage V of amplifying through current mirror
OUT=I
2* R
2=V
BG* (R
2* (W/L)
Reference edge/ R
1* (W/L)
The mirror image end), wherein (W/L)
Reference edge, (W/L)
The mirror image endBe respectively the raceway groove width/length ratio of reference edge and mirror image end transistor.
By adding current mirror in the voltage regulating device circuit, the former resistance that is connected in the operational amplifier loop changes the mirror image end that is connected to current mirror, therefore, can decide the size of image current by the ratio of adjusting transistor channel width/length degree or resistance, and then decision output voltage size, can solve in the known technology and bear in the loop, cause the reduction of loop gain and the shakiness of circuit because of resistance is connected in.
Description of drawings
Fig. 1 is the voltage regulating device circuit diagram of known technology;
Fig. 2 is another voltage regulating device circuit diagram of known technology; And
Fig. 3 is the voltage regulating device circuit diagram of a preferred embodiment of the present invention.
The main element symbol description
I
1Reference current I
2Image current
V
BGReference voltage V
OUTThe output terminal of voltage regulator circuit
V
AOperational amplifier positive input terminal node voltage
V
BNode voltage (resistance R among Fig. 2
1, R
2Series connection place)
1,10,20 voltage regulating devices
2,12,22 operational amplifiers
R
1, R
2Resistance
P
1, P
2, P
3, P
4The PMOS transistor
Embodiment
See also Fig. 3, in Fig. 3, show a voltage regulator circuit of the present invention.One voltage regulating device 20 comprises a current mirror 24, one operational amplifiers 22, one first resistance R at least
1, one second resistance R
2, one the one PMOS transistor P
1, one the 2nd PMOS transistor P
2The reference edge of current mirror 24 is connected in series a PMOS transistor P in regular turn
1, first resistance R
1And hold with arriving, its mirror image end is connected second resistance R 2 to the ground end, wherein current mirror 24 is made up of PMOS transistor P3, the P4 of two common gates, the common voltage source V dd that connects of the source electrode of transistor P3, P4, the drain electrode of transistor P3 simultaneously and grid own couples mutually again and be connected to node C place with the source electrode of a PMOS transistor P1, the drain electrode of transistor P4 is connected in series second resistance R 2 by node D and holds with arriving, and its node D place is the output terminal of voltage regulating device 20.
Operational amplifier 22, its negative input end connects the drain electrode that a reference voltage VBG, positive input terminal connect first resistance R 1 and a PMOS transistor P1, its output terminal connects the drain electrode of grid and the 2nd PMOS transistor P2 of a PMOS transistor P1, wherein operational amplifier 22 output terminal output signals are in order to drive a PMOS transistor P1, and its drain electrode of the 2nd PMOS transistor P2 is connected with the grid of a PMOS transistor P1, in order to (Reset) voltage regulating device of resetting.
After operational amplifier 22 is with the reference voltage VBG of its negative input end and the voltage VA of positive input terminal (being the voltage on the resistance R 1) comparison, the voltage VA that can draw high positive input terminal is identical with reference voltage VBG, the defeated terminal voltages of operational amplifier 22 are reduced and and Vdd produce a voltage difference, to drive a PMOS transistor P1 conducting, produce the reference current I1 of current mirror 24, can obtain a voltage VB=I1 * R1=VA in the Node B place, voltage VA is identical with VBG again, be VBG=VA=I1 * R1, I1=VBG/R1, wherein reference current I1 is the electric current during PMOS transistor P3 conducting in the current mirror, and the image current I2 in the current mirror belongs to another PMOS transistor P
4The electric current of conducting, itself and reference current I1 are proportional, i.e. I2=I1 * (W/L)
P4/ (W/L)
P3(W/L is transistorized raceway groove width/length ratio) can obtain the effect of amplified current I2, and electric current I 2 be the key factor of decision output voltage by adjusting the ratio of two transistor P3, P4 raceway groove width/length.
Voltage regulating device 20 output terminals are that the mirror image end of current mirror 24 is connected in series the D of place with second resistance R 2, so output voltage is the voltage on the resistance R 2, its value determines by R2 resistance value and electric current I 2 sizes, can get the value VOUT=I2 * R2=I1 of the output voltage of voltage regulating device * (W/L) thus
P4/ (W/L)
P3* R2=VBG * (R2* (W/L)
P4/ R1* (W/L)
P3), promptly we can be by adjusting transistor P
3, P
4The ratio of raceway groove width/length makes output voltage be greater than or less than reference voltage VBG to amplify or to dwindle electric current I 2, perhaps adjusts resistance R 1, R2 to amplify or to dwindle output voltage values V
OUT
Advantage of the present invention:
A. the reduction that can be external many different circuit of its output terminal and the resistance in the formed negative feedback loop of operational amplifier all can cause loop gain in known technology is with unstable; Yet the present invention utilizes and adds a current mirror in voltage regulating device, and the mirror image end that the output terminal and the resistance in the loop of voltage regulating device is moved to current mirror with connect, so we still can be by adjusting resistance R 1, R2 ratio with the decision output voltage values, and output terminal is connected with current mirror with resistance R 2 and the formed negative-feedback circuit of operational amplifier there is no direct connection relational, its external circuits and resistance value no longer influence loop gain, also solve the problem of known technology.
B. the current mirror that the present invention again increased is in the voltage regulating device circuit, can make us by adjusting the raceway groove width/length ratio of two transistor in the current mirror, to change image current I2, and then the size of decision voltage regulating device circuit output voltage, and be a burning voltage via the output voltage of current mirror gained.
Though the present invention with preferred embodiment openly as above; right its is not that any those skilled in the art are under the situation that does not break away from the spirit and scope of the present invention in order to qualification the present invention; can change and modification, so protection scope of the present invention is as the criterion with the claim institute restricted portion that is proposed.
Claims (9)
1. voltage regulating device includes:
One operational amplifier, this operational amplifier includes a positive input terminal, a negative input end and an output terminal, wherein the negative input end of this operational amplifier connects a reference voltage;
One current mirror, this current mirror include a reference edge and a mirror image end; And
One the first transistor, the gate terminal of this first transistor is connected with the output terminal of this operational amplifier, and source terminal is connected to the reference edge of this current mirror, and drain electrode end is connected to the positive input terminal of this operational amplifier.
2. voltage regulating device as claimed in claim 1, wherein also include a transistor seconds, wherein the source terminal of this transistor seconds connects a voltage source, and drain electrode end is connected to the gate terminal of positive input terminal and this first transistor of this operational amplifier, in order to this voltage adjusting device of resetting.
3. voltage regulating device as claimed in claim 2, wherein this first transistor and this transistor seconds are the P-type mos transistor.
4. voltage regulating device as claimed in claim 1 wherein also includes one first resistance, and this first resistance is connected between the drain electrode end and earth terminal of this first transistor.
5. voltage regulating device as claimed in claim 1, wherein this current mirror has one the 3rd transistor and one the 4th transistor, the 3rd transistorized gate terminal is connected with the 4th transistorized gate terminal, the 3rd transistorized source terminal is connected with the 4th transistorized source terminal and is connected to this voltage source again, the 3rd transistor drain end is connected with the source terminal of this transistor seconds, and the 3rd transistor drain end coupling knot is to the 3rd transistorized gate terminal.
6. voltage regulating device as claimed in claim 5, wherein the 3rd transistor and the 4th transistor are the P-type mos transistor.
7. voltage regulating device as claimed in claim 5 wherein can pass through adjustment the 3rd and the 4th transistorized raceway groove width/length ratio, and obtains the output voltage of different these voltage regulating devices.
8. voltage regulating device as claimed in claim 1 wherein also comprises one second resistance, and this second resistance is connected between the 4th transistor drain end and the earth terminal.
9. voltage regulating device as claimed in claim 1, wherein also comprise this first resistance and this second resistance, this first resistance is connected between the drain electrode end and earth terminal of this first transistor, this second resistance is connected between the 4th transistor drain end and the earth terminal, can by adjust this first with the resistance value ratio of this second resistance, and obtain the output voltage of different these voltage regulating devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510078646 CN1702588A (en) | 2005-06-22 | 2005-06-22 | Voltage regulation apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510078646 CN1702588A (en) | 2005-06-22 | 2005-06-22 | Voltage regulation apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1702588A true CN1702588A (en) | 2005-11-30 |
Family
ID=35632363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510078646 Pending CN1702588A (en) | 2005-06-22 | 2005-06-22 | Voltage regulation apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1702588A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103179743A (en) * | 2009-03-04 | 2013-06-26 | 立锜科技股份有限公司 | Led driver with direct ac-dc conversion and control, and method and integrated circuit therefor |
| CN103457465A (en) * | 2013-09-17 | 2013-12-18 | 长安大学 | Constant-current/constant-voltage DC-DC conversion system with external adjustable current-limiting function |
| CN103546703A (en) * | 2012-07-13 | 2014-01-29 | 李冰 | Complementary Metal-Oxide-Semiconductor (CMOS) imaging sensor |
| CN103543778A (en) * | 2012-07-09 | 2014-01-29 | 南亚科技股份有限公司 | Current providing circuit and voltage providing circuit |
| CN109976430A (en) * | 2019-04-29 | 2019-07-05 | 苏州易美新思新能源科技有限公司 | A kind of DC power supply circuit |
| CN114564068A (en) * | 2022-03-02 | 2022-05-31 | 重庆吉芯科技有限公司 | Adaptive current generation circuit and method applied to high-speed ADC input buffer |
-
2005
- 2005-06-22 CN CN 200510078646 patent/CN1702588A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103179743A (en) * | 2009-03-04 | 2013-06-26 | 立锜科技股份有限公司 | Led driver with direct ac-dc conversion and control, and method and integrated circuit therefor |
| CN103543778A (en) * | 2012-07-09 | 2014-01-29 | 南亚科技股份有限公司 | Current providing circuit and voltage providing circuit |
| CN103543778B (en) * | 2012-07-09 | 2016-01-27 | 南亚科技股份有限公司 | Current providing circuit and voltage supply circuit |
| CN103546703A (en) * | 2012-07-13 | 2014-01-29 | 李冰 | Complementary Metal-Oxide-Semiconductor (CMOS) imaging sensor |
| CN103546703B (en) * | 2012-07-13 | 2018-06-08 | 李冰 | Cmos image sensor |
| CN103457465A (en) * | 2013-09-17 | 2013-12-18 | 长安大学 | Constant-current/constant-voltage DC-DC conversion system with external adjustable current-limiting function |
| CN109976430A (en) * | 2019-04-29 | 2019-07-05 | 苏州易美新思新能源科技有限公司 | A kind of DC power supply circuit |
| CN114564068A (en) * | 2022-03-02 | 2022-05-31 | 重庆吉芯科技有限公司 | Adaptive current generation circuit and method applied to high-speed ADC input buffer |
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