CN103296975A - Operational amplifier with multiple power domains and voltage generator using same - Google Patents
Operational amplifier with multiple power domains and voltage generator using same Download PDFInfo
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- CN103296975A CN103296975A CN2012100550286A CN201210055028A CN103296975A CN 103296975 A CN103296975 A CN 103296975A CN 2012100550286 A CN2012100550286 A CN 2012100550286A CN 201210055028 A CN201210055028 A CN 201210055028A CN 103296975 A CN103296975 A CN 103296975A
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Abstract
An operational amplifier with multiple power domains comprises an input stage circuit, a power domain switching circuit and an active load, wherein the input stage circuit is used for transforming a group of input voltages into a group of input currents in a first power domain; the power domain switching circuit is used for transforming the group of input currents into a group of output currents in a second power domain; the active load generates an output voltage according to the group of output currents; and common mode range of the output voltage translates relative to a common made range of the group of input voltages.
Description
Technical field
The invention relates to a kind of multiple power domain operational amplifier and use its voltage generator.
Background technology
Lead because of in property of semiconductor element, many application all need one group of not reference voltage and negative reference voltage of temperature influence, and its voltage swing is about+5 volts and-5 volts, near 6 volts of the withstand voltage upper limits of medium pressure element.Industry general using energy gap reference circuit (bandgap reference circuit) produces and is about 1.2 volts zero-temperature coefficient reference voltage, be that benchmark passes through that pressurizer (regulator) boosts and the operation of step-down with this zero-temperature coefficient reference voltage again, so can produce the needed reference voltage of various application.
Please refer to Fig. 1, it illustrates the circuit diagram of an example of conventional voltage generator.Voltage generator 10 comprises a unity gain buffer (unity gain buffer) 12,1 first pressurizer 14 and one second pressurizer 16.In Fig. 1, operating voltage VDD for example is 3 volts, the zero-temperature coefficient reference voltage V that the energy gap reference circuit produces
RefFor example be 1.2 volts.Zero-temperature coefficient reference voltage V
RefCan utilize first pressurizer 14 and second pressurizer 16, concern that by resistance (R1+R2)/R1=5/1.2 boosts and the operation of step-down obtains reference voltage V
OUTP=5 volts and negative reference voltage V
OUTN=-5 volts.Wherein, second pressurizer 16 is because be reference point with 0 volt of ground voltage, so the transduction operational amplifier of its inside (operational transconductance amplifier, OTA) 18 power domain be required to be VDD～-2VDD=3 volt～-6 volt, surpass the withstand voltage restriction of medium pressure element and must adopt high voltage device.Thus, the element characteristic of high voltage device reduces the integrated circuit performance than missionary society, and takies a large amount of layout areas.
Please refer to Fig. 2, it illustrates another routine circuit diagram of conventional voltage generator.Voltage generator 20 comprises a unity gain buffer 22, one first pressurizer 24, one second pressurizer 26 and one the 3rd pressurizer 28.In Fig. 2, operating voltage VDD for example is 3 volts, the zero-temperature coefficient reference voltage V that the energy gap reference circuit produces
RefFor example be 1.2 volts.Zero-temperature coefficient reference voltage V
RefUtilize first pressurizer 24, the operation of boosting by the resistance relation obtains reference voltage V
OUTP=5 volts.In addition, zero-temperature coefficient reference voltage V
RefUtilizing second pressurizer 26 is reference point with 0 volt of ground voltage, carries out the operation of step-down and obtains earlier-V
Ref=-1.2 volts, the operation of carrying out the secondary step-down by the 3rd pressurizer 28 obtains negative reference voltage V again
OUTN=-5 volts.Two-stage stabilizator structure 26 and 28 by series connection (cascade), make the power domain of second pressurizer 26 be VDD～-VDD=3 volt～-3 volt, and the power domain of the 3rd pressurizer 28 be GND～-2VDD=0 volt～-6 volt, all maintain the use of avoiding high voltage device in the withstand voltage scope of medium pressure element.Yet, in the structure of voltage generator 20, the influence that the pressurizer of many one-levels but can make output voltage be offset (offset) and be subjected to power supply noise (power noise).
In addition, be converted in the process of negative voltage at positive voltage, voltage generator 10 and 20 respectively necessary applying unit gain buffer 12 and 22 are so that zero-temperature coefficient reference voltage V
RefPossesses thrust so that electric current output to be provided.Yet unity gain buffer 12 and 22 use also can increase the skew of output voltage and the influence of power supply noise except increasing circuit complexity and layout area.
Summary of the invention
The invention relates to a kind of multiple power domain operational amplifier and use its voltage generator.The conversion of the power domain by multiple power domain operational amplifier makes voltage generator need not use high voltage device can produce required reference voltage and negative reference voltage.
According to a first aspect of the invention, propose a kind of multiple power domain operational amplifier, comprise an input stage circuit, a power domain change-over circuit and an active load.Input stage circuit is in order to be converted to one group of input voltage one group of input current in one first power domain.The power domain change-over circuit is one group of output current in a second source territory in order to change this group input current.Active load is in order to produce an output voltage according to this group output current, and wherein the altogether exemplary of output voltage encloses that to enclose with respect to the model altogether of this group input voltage be to produce translation.
According to a second aspect of the invention, propose a kind of voltage generator, comprise a series resistor, one first pressurizer and one second pressurizer.Series resistor has one first feedback end and one second feedback end.First pressurizer is in order to export one first output voltage, first pressurizer comprises the multiple power domain operational amplifier with negative feedback configuration, multiple power domain operational amplifier operate in one first power domain with a second source territory in, multiple power domain operational amplifier has an inverting input and receives one first reference voltage, and a normal phase input end is coupled to first feedback end.Second pressurizer is in order to export one second output voltage, second pressurizer comprises a single power supply domain operation amplifier that operates in one the 3rd power domain and have the negative feedback configuration, single power supply domain operation amplifier has an inverting input and receives one second reference voltage, and a normal phase input end is coupled to second feedback end.
For there is better understanding above-mentioned and other aspect of the present invention, an embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 illustrates the circuit diagram of an example of conventional voltage generator.
Fig. 2 illustrates another routine circuit diagram of conventional voltage generator.
Fig. 3 illustrates the schematic diagram according to the multiple power domain operational amplifier of an embodiment.
Fig. 4 illustrates the circuit diagram according to the multiple power domain operational amplifier of an embodiment.
Fig. 5 illustrates the circuit diagram according to the multiple power domain operational amplifier of another embodiment.
Fig. 6 illustrates the circuit diagram according to the voltage generator of an embodiment.
[main element label declaration]
10,20,600: voltage generator 12,22: unity gain buffer
14,24,610: the first pressurizers 16,26,620: the second pressurizers
18: 28: the three pressurizers of transduction operational amplifier
300,400,500,615: multiple power domain operational amplifier
310,410,510: input stage circuit 320,420,520: the power domain change-over circuit
424: the second groups of current mirrors of 422: the first groups of current mirrors
522: the first groups of 524: the second groups of connection circuits that change of connection circuit that change
330,430,530: active load 625: single power supply domain operation amplifier
Embodiment
Multiple power domain proposed by the invention (power domain) operational amplifier and use its voltage generator, the common mode range (common mode range) of conversion to adjust multiple power domain operational amplifier by power domain makes voltage generator need not use high voltage device can produce required reference voltage and negative reference voltage.
Please refer to Fig. 3, it illustrates the schematic diagram according to the multiple power domain operational amplifier of an embodiment.Multiple power domain operational amplifier 300 comprises an input stage circuit 310, a power domain change-over circuit 320 and an active load (active load) 330.Input stage circuit 310 is coupled to one first voltage source V DD, its can by single PMOS input to, single NMOS input to or PMOS input to and NMOS input to constitute.Input stage circuit 310 is in order to one group of input voltage (V
In+, V
In-) be converted to one group of input current (I in one first power domain
In+, I
In-).First power domain is between first voltage source and second voltage source.In this example, first voltage source is to be exemplified as VDD, and second voltage source is to be exemplified as-VDD, that is first power domain be (VDD～-VDD).Particularly, the first voltage source V DD for example is 3 volts, and second voltage source-VDD for example is-3 volts.
Power domain change-over circuit 320 comprises one first current buffer and one second current buffer.First current buffer is coupled between input stage circuit 310 and the second voltage source-VDD, and in order to change this group input current (I
In+, I
In-) be one group of relaying electric current in a relaying power domain.The first relaying power domain is between second voltage source and tertiary voltage source (being GND for example).In this example, continue power domain in first and be to be exemplified as (VDD～GND).Second current buffer is coupled between first current buffer and the tertiary voltage source GND, and in order to be created in one group of output current (I in the second source territory according to this group relaying electric current
Out+, I
Out-).The second source territory between tertiary voltage source and the 4th voltage source (for example be-2VDD) between.In this example, the second source territory be exemplified as (GND～-2VDD) (more specifically, for example be 0 volt～-6 volts).
Please refer to Fig. 4, it illustrates the circuit diagram according to the multiple power domain operational amplifier of an embodiment.Multiple power domain operational amplifier 400 comprises an input stage circuit 410, a power domain change-over circuit 420 and an active load 430.Input stage circuit 410 can by PMOS input to constitute, it is coupled to the first voltage source V DD.Input stage circuit 410 is with input voltage (V
In+, V
In-) be converted to input current (I
In+, I
In-).In Fig. 4, lifting power domain change-over circuit 420 now is that a current mirror framework circuit is that example explains.Current mirror framework circuit 420 has one first group of current mirror 422 and one second group of current mirror 424 to realize first current buffer and second current buffer respectively.
First group of current mirror 422 is coupled between input stage circuit 410 and the second voltage source-VDD, and in order to change input current (I
In+, I
In-) be relaying electric current (I
Re+, I
Re-).Second group of current mirror 424 is coupled between first group of current mirror 422 and the tertiary voltage source GND, and provides output current (I in order to foundation tertiary voltage source GND for datum mark
Out+, I
Out-) give active load 430 to produce output voltage V
Out Active load 430 is coupled between second group of current mirror 424 and the 4th voltage source-2VDD.Because output voltage V
OutCommon mode range with respect to input voltage (V
In+, V
In-) common mode range produce translation, so need not use high voltage device namely can the GND=0 volt as datum mark export GND～-voltage of 2VDD=0 volt～-6 volt.
Please refer to Fig. 5, it illustrates the circuit diagram according to the multiple power domain operational amplifier of another embodiment.Multiple power domain operational amplifier 500 comprises an input stage circuit 510, a power domain change-over circuit 520 and an active load 530.Input stage circuit 510 by PMOS input to constitute, it is coupled to the first voltage source V DD.Input stage circuit 510 is with input voltage (V
In+, V
In-) be converted to input current (I
In+, I
In-).In Fig. 5, lifting power domain change-over circuit 520 now and be a folding type, repeatedly to connect the framework circuit be that example explains.Current mirror framework circuit 520 has one first group of change connection circuit (folded-cascode) 522 and one second group of connection circuit (folded-cascode) 524 that changes to realize first current buffer and second current buffer respectively.
First group of connection circuit 522 that changes is coupled between input stage circuit 510 and the second voltage source-VDD, and in order to change input current (I
In+, I
In-) be relaying electric current (I
Re+, I
Re-).Second group of connection circuit 524 that changes is coupled to first group and changes between connection circuit 522 and the tertiary voltage source GND, and provides output current (I in order to foundation tertiary voltage source GND for datum mark
Out+, I
Out-) give active load 530 to produce output voltage V
Out Active load 530 is coupled to second group and changes between connection circuit 524 and the 4th voltage source-2VDD.Because output voltage V
OutCommon mode range with respect to input voltage (V
In+, V
In-) common mode range produce translation, so need not use high voltage device namely can the GND=0 volt as datum mark export GND～-voltage of 2VDD=0 volt～-6 volt.In addition, the access node structure receives and output current because multiple power domain operational amplifier 500 changes with folding type, has better linear voltage stabilization and anti-noise ability, and can provide higher input common-mode range and output common mode scope under the condition of same power.
In above-mentioned power domain change-over circuit 420/520, though be that example describes with two current buffers only, so be not limited to this, power domain change-over circuit 420/520 also can comprise one or more the 3rd current buffer, be coupled between first current buffer and second current buffer, in order to foundation input current (I
In+, I
In-), and produce other one to multiple group of relaying electric current, and offer second current buffer with one group in the middle of other one to multiple group of relaying electric current, wherein the power domain of other one to multiple group of relaying electric current is differing from each other.
Please refer to Fig. 6, it illustrates the circuit diagram according to the voltage generator of an embodiment.Voltage generator 600 comprises a series resistor R1, one first pressurizer 610 and one second pressurizer 620.Series resistor R1 has one first feedback end (node A) and one second feedback end (Node B).First pressurizer 610 is in order to export one first output voltage V
OUTN First pressurizer 610 comprises the multiple power domain operational amplifier 615 with negative feedback configuration, resistance R 3 and R4 and transistor M1, wherein R3=R1 and the R4=R2 that is connected in series each other.First end of resistance R 3 is coupled to first feedback end (node A).Transistor M1 has that one first end is coupled to voltage source-2VDD, one second end is coupled to second end of resistance R 4 and the output that a control end is coupled to multiple power domain operational amplifier 615.
The side circuit framework of multiple power domain operational amplifier 615 can be as the aforementioned shown in the multiple power domain operational amplifier 300/400/500.Multiple power domain operational amplifier 615 is coupled between one first voltage source V DD and the second voltage source-VDD, and is coupled between a tertiary voltage source GND and the 4th voltage source-2VDD.Multiple power domain operational amplifier 615 operate in one first power domain (VDD～-VDD) in a second source territory (GND～-2VDD) in.Multiple power domain operational amplifier 615 has an inverting input and receives one first reference voltage GND, and a normal phase input end is coupled to first feedback end (node A).Thus, first feedback end (node A) can be stable at the first reference voltage GND.
The required electric current of first feedback end (node A) that second feedback end (Node B) that is coupled by second pressurizer 620 provides first pressurizer 610 to couple namely can merge first pressurizer 610 and second pressurizer 620.Thus, pass through V
Feedback, B=V
Ref=1.2 volts and V
Feedback, A=GND=0 volt produces required direct current flow through resistance R 2, R3 and R4 in resistance R 1, can obtain first output voltage V
OUTN=-5 volts and second output voltage V
OUTP=5 volts.
The disclosed multiple power domain operational amplifier of the above embodiment of the present invention and use its voltage generator, the conversion of the power domain by multiple power domain operational amplifier, can adjust the common mode range of multiple power domain operational amplifier, make voltage generator need not use high voltage device, and utilize the pressurizer of small number can produce required reference voltage and negative reference voltage.Thus, not only simplify the complex circuit designs degree and reduce layout area, can also significantly reduce element the do not match variation that causes and the power supply noise that produces by power transistor.
In sum, though the present invention discloses as above with a plurality of embodiment, so it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (27)
1. multiple power domain operational amplifier comprises:
One input stage circuit is in order to be converted to one group of input voltage one group of input current in one first power domain;
One power domain change-over circuit is one group of output current in a second source territory in order to change this group input current; And
One active load, in order to produce an output voltage according to this group output current, wherein the altogether exemplary of this output voltage encloses that to enclose with respect to the model altogether of this group input voltage be the generation translation.
2. multiple power domain operational amplifier according to claim 1, wherein this power domain change-over circuit comprises:
One first current buffer is one group of relaying electric current in a relaying power domain in order to change this group input current; And
One second current buffer is in order to produce this group output current according to this group relaying electric current.
3. multiple power domain operational amplifier according to claim 2, wherein this input stage circuit is coupled to one first voltage source, this first current buffer is coupled between this input stage circuit and one second voltage source, this second current buffer is coupled between this first current buffer and the tertiary voltage source, and this active load is coupled between this second current buffer and one the 4th voltage source.
4. multiple power domain operational amplifier according to claim 2, wherein this power domain change-over circuit also comprises:
At least one the 3rd current buffer, be coupled between this first current buffer and this second current buffer, in order to organize input current according to this, and produce at least one group of other relaying electric current, and will this at least one group in the middle of other relaying electric current one group offer this second current buffer, wherein the power domain of this at least one group other relaying electric current is differing from each other.
5. multiple power domain operational amplifier according to claim 1, wherein this input stage circuit utilize PMOS input to or NMOS input to this input voltage being converted to this group input current.
6. multiple power domain operational amplifier according to claim 1, wherein this input stage circuit utilize PMOS input to and NMOS input to this input voltage being converted to this group input current.
7. multiple power domain operational amplifier according to claim 1, wherein this power domain change-over circuit is a current mirror framework circuit.
8. multiple power domain operational amplifier according to claim 7, wherein this input stage circuit is coupled to one first voltage source, this current mirror framework circuit has one first group of current mirror and is coupled between this input stage circuit and one second voltage source, and one second group of current mirror is coupled between this first group of current mirror and the tertiary voltage source, and this active load is coupled between this second group of current mirror and one the 4th voltage source.
9. multiple power domain operational amplifier according to claim 1, wherein this power domain change-over circuit is that a folding type repeatedly connects the framework circuit.
10. multiple power domain operational amplifier according to claim 9, wherein this input stage circuit is coupled to one first voltage source, this folding type repeatedly connects the framework circuit to have one first group of connection circuit that changes and is coupled between this input stage circuit and one second voltage source, and one second group of connection circuit that changes is coupled to this first group and changes between connection circuit and the tertiary voltage source, and this active load is coupled to this second group and changes between connection circuit and one the 4th voltage source.
11. multiple power domain operational amplifier according to claim 1, wherein this active load is made of a current mirror or a current source.
12. a voltage generator comprises:
One series resistor has one first feedback end and one second feedback end;
One first pressurizer, in order to export one first output voltage, this first pressurizer comprises the multiple power domain operational amplifier with negative feedback configuration, this multiple power domain operational amplifier operate in one first power domain with a second source territory in, this multiple power domain operational amplifier has an inverting input and receives one first reference voltage, and a normal phase input end is coupled to this first feedback end; And
One second pressurizer, in order to export one second output voltage, this second pressurizer comprises a single power supply domain operation amplifier that operates in one the 3rd power domain and have the negative feedback configuration, this single power supply domain operation amplifier has an inverting input and receives one second reference voltage, and a normal phase input end is coupled to this second feedback end.
13. voltage generator according to claim 12, wherein this multiple power domain operational amplifier is coupled between one first voltage source and one second voltage source, and be coupled between a tertiary voltage source and one the 4th voltage source, this single power supply territory operational amplifier is coupled between one the 5th voltage source and this tertiary voltage source.
14. voltage generator according to claim 12, wherein this first feedback end and this second feedback end are to be stable at this first reference voltage and this second reference voltage respectively.
15. voltage generator according to claim 12, wherein this first pressurizer also comprises:
Chuan Jie at least one resistance has one first end and one second end each other, and this first end is serially connected with this first feedback end; And
One transistor has one first end and is coupled to a voltage source, and one second end is coupled to this second end of this at least one resistance, and a control end is coupled to an output of this multiple power domain operational amplifier.
16. voltage generator according to claim 12, wherein this second pressurizer also comprises:
Chuan Jie at least one resistance has one first end and one second end each other, and this first end is serially connected with this second feedback end; And
One transistor has one first end and is coupled to a voltage source, and one second end is coupled to this second end of this at least one resistance, and a control end is coupled to an output of this single power supply domain operation amplifier.
17. voltage generator according to claim 12, wherein this multiple power domain operational amplifier comprises:
One input stage circuit comprises one group of input as this normal phase input end and this inverting input of this multiple power domain operational amplifier, and the one group of input voltage that receives according to this group input, and is created in one group of input current in this first power domain;
One power domain change-over circuit is one group of output current in this second source territory in order to change this group input current; And
One active load, in order to produce one the 3rd output voltage according to this group output current, wherein the altogether exemplary of the 3rd output voltage encloses that to enclose with respect to the model altogether of this group input voltage be the generation translation.
18. voltage generator according to claim 17, wherein this power domain change-over circuit comprises:
One first current buffer is one group of relaying electric current in a relaying power domain in order to change this group input current; And
One second current buffer is in order to produce this group output current according to this group relaying electric current.
19. voltage generator according to claim 18, wherein this input stage circuit is coupled to one first voltage source, this first current buffer is coupled between this input stage circuit and one second voltage source, this second current buffer is coupled between this first current buffer and the tertiary voltage source, and this active load is coupled between this second current buffer and one the 4th voltage source.
20. voltage generator according to claim 18, wherein this power domain change-over circuit also comprises:
At least one the 3rd current buffer, be coupled between this first current buffer and this second current buffer, in order to organize input current according to this, and produce at least one group of other relaying electric current, and will this at least one group in the middle of other relaying electric current one group offer this second current buffer, wherein the power domain of this at least one group other relaying electric current is differing from each other.
21. voltage generator according to claim 17, wherein this input stage circuit utilize PMOS input to or NMOS input to this input voltage being converted to this group input current.
22. voltage generator according to claim 17, wherein this input stage circuit utilizes PMOS input to reaching NMOS input to this input voltage being converted to this group input current.
23. voltage generator according to claim 17, wherein this power domain change-over circuit is a current mirror framework circuit.
24. voltage generator according to claim 23, wherein this input stage circuit is coupled to one first voltage source, this current mirror framework circuit has one first group of current mirror and is coupled between this input stage circuit and one second voltage source, and one second group of current mirror is coupled between this first group of current mirror and the tertiary voltage source, and this active load is coupled between this second group of current mirror and one the 4th voltage source.
25. voltage generator according to claim 17, wherein this power domain change-over circuit is that a folding type repeatedly connects the framework circuit.
26. voltage generator according to claim 25, wherein this input stage circuit is coupled to one first voltage source, this folding type repeatedly connects the framework circuit to have one first group of connection circuit that changes and is coupled between this input stage circuit and one second voltage source, and one second group of connection circuit that changes is coupled to this first group and changes between connection circuit and the tertiary voltage source, and this active load is coupled to this second group and changes between connection circuit and one the 4th voltage source.
27. voltage generator according to claim 17, wherein this active load is made of a current mirror or a current source.
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|---|---|---|---|
| CN201210055028.6A CN103296975B (en) | 2012-03-05 | 2012-03-05 | Multiple power source domain operation amplifier and use its voltage generator |
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| CN103296975B CN103296975B (en) | 2016-05-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106505953A (en) * | 2016-07-05 | 2017-03-15 | 络达科技股份有限公司 | Operational amplifier circuit |
| CN114003079A (en) * | 2020-07-28 | 2022-02-01 | 瑞昱半导体股份有限公司 | Circuit applied to multiple power domains |
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| US6833760B1 (en) * | 2003-07-07 | 2004-12-21 | National Semiconductor Corporation | Low power differential amplifier powered by multiple unequal power supply voltages |
| CN101453835A (en) * | 2007-12-04 | 2009-06-10 | 华为技术有限公司 | Transformer, method and device for capacitor integration package |
| US20090146738A1 (en) * | 2007-12-06 | 2009-06-11 | Himax Technologies Limited | Operational amplifier |
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| US5581212A (en) * | 1993-10-18 | 1996-12-03 | Industrial Technology Research Institute | Fully differential CMOS transconductance-transimpedance wide-band amplifier |
| US6833760B1 (en) * | 2003-07-07 | 2004-12-21 | National Semiconductor Corporation | Low power differential amplifier powered by multiple unequal power supply voltages |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106505953A (en) * | 2016-07-05 | 2017-03-15 | 络达科技股份有限公司 | Operational amplifier circuit |
| CN106505953B (en) * | 2016-07-05 | 2019-03-22 | 络达科技股份有限公司 | Operational amplifier circuit |
| CN114003079A (en) * | 2020-07-28 | 2022-02-01 | 瑞昱半导体股份有限公司 | Circuit applied to multiple power domains |
| CN114003079B (en) * | 2020-07-28 | 2023-08-08 | 瑞昱半导体股份有限公司 | Circuit applied to multiple power domains |
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|---|---|
| CN103296975B (en) | 2016-05-11 |
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