CN101277094B - Operation amplifier capable of compensating migration voltage - Google Patents
Operation amplifier capable of compensating migration voltage Download PDFInfo
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- CN101277094B CN101277094B CN200710088999A CN200710088999A CN101277094B CN 101277094 B CN101277094 B CN 101277094B CN 200710088999 A CN200710088999 A CN 200710088999A CN 200710088999 A CN200710088999 A CN 200710088999A CN 101277094 B CN101277094 B CN 101277094B
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Abstract
An operational amplifier which can compensate the excursion voltage comprises the following components: an input stage circuit which includes a positive input end, a negative input end, a first current output end and a second current output end, and is used for outputting the corresponding currents by the first current output end and the second current output end according to the voltage received by the positive input end and the negative input end; an output stage circuit which is coupled between the first current output end and the second current output end of the output stage circuit, and is used for outputting voltage according to the current of the first current output end and the second current output end; and an adjusting device which is coupled between the input stage circuit and the output stage circuit, and is used for adjusting the current of the first current output end and the second current output end to compensate the effect of the excursion voltage.
Description
Technical field
But the present invention relates to a kind of operational amplifier of compensating migration voltage, particularly relate to a kind of by the size of current between input stage circuit and output-stage circuit in the adjustment operational amplifier, with the operational amplifier of the influence that compensating migration voltage was caused.
Background technology
Operational amplifier is that an important circuit bank becomes assembly in the various electronic installations, and it is widely used in fields such as household electrical appliances, industry and scientific instrument.Circuit designers often can use operational amplifier to realize many different operational functions, as buffer, filter, analog-to-digital converter etc.
Desirable operational amplifier possesses following properties: input impedance infinity, output impedance equal zero, open that loop gain infinity, common mode mutual exclusion are more infinitely great than (Common Mode Rejection Ratio), frequency range is infinitely great.Yet because the restriction of semiconductor technology and integrated circuit technique, in fact, the realization of ideal operational amplifier has its degree of difficulty.In order to represent the characteristic of true operational amplifier, known technology is an imperfection of representing operational amplifier with an offset voltage (Offset Voltage).
Please refer to Fig. 1, Fig. 1 is the schematic diagram of a known operations amplifier 10.Operational amplifier 10 comprises an input stage circuit 100, an output-stage circuit 102 and an equivalent voltage source 104.Operational amplifier 10 receives differential signal by a positive input terminal Vp and a negative input end Vn, and by the result after the output end vo output amplification.Equivalent voltage source 104 is used for representing the imperfection (not being present on the side circuit) of operational amplifier 10, when the voltage Vos that it produced represents that output end vo is coupled to negative input end Vn (forming unit gain back coupling framework), voltage difference between output end vo and positive input terminal Vp, i.e. operational amplifier 10 offset voltages.The reason that offset voltage produces has many, does not match as Semiconductor Physics characteristic, technology defect, assembly etc.
Please refer to Fig. 2, Fig. 2 is the schematic diagram of input stage circuit 100 among Fig. 1.Input stage circuit 100 produces electric current I d1, Id2 to output-stage circuit 102 in order to the voltage according to positive input terminal Vp and negative input end Vn, and it includes input transistors P1, P2 and a current source 200.Input transistors P1, P2 are all P type metal-oxide semiconductor transistor, and it is differential right to form a common source, and its common-mode voltage is Vc.Under ideal case, characteristics such as the channel length of input transistors P1, P2, channel width are identical, then the current Ib that produced of current source 200 can flow to the source electrode of input transistors P1, P2 fifty-fifty, make that the source electrode of input transistors P1, P2 is identical to the voltage of grid, be that voltage Vos is 0, and electric current I d1 equate with Id2.Yet, in fact, when input transistors P1, P2 do not mate fully because of technologic some characteristic, can cause the threshold voltage (ThresholdVoltage) of input transistors P1, P2 unequal, make that the source electrode of input transistors P1, P2 is unequal to the voltage of grid, then offset voltage Vos is not equal to 0, and electric current I d1 and Id2 are unequal.
In brief,, cause the offset voltage of known operations amplifier to be not equal to 0, influence its performance owing to factors such as Semiconductor Physics characteristic, technology defect, assembly do not match.Therefore, the influence that how to reduce the operational amplifier offset voltage promptly becomes one of problem that industry makes great efforts.
Summary of the invention
Therefore, but main purpose of the present invention promptly is to provide a kind of operational amplifier of compensating migration voltage.
But the present invention discloses a kind of operational amplifier of compensating migration voltage, include an input stage circuit, include a positive input terminal, a negative input end, one first current output terminal and one second current output terminal, be used for the voltage that receives according to this positive input terminal and this negative input end, by this first current output terminal and the corresponding electric current of this second current output terminal output; One output-stage circuit is coupled to this first current output terminal and this second current output terminal of this input stage circuit, is used for electric current according to this first current output terminal and this second current output terminal, output voltage; And an adjusting device, be coupled between this input stage circuit and this output-stage circuit, be used for adjusting the electric current of this first current output terminal and this second current output terminal, with the influence of compensating migration voltage.
But the present invention also discloses a kind of track to track formula operational amplifier of compensating migration voltage, includes an input stage circuit, an output-stage circuit and an adjusting device; Wherein, described input stage circuit includes a positive input terminal, a negative input end, one first current output terminal, one second current output terminal, one first electric current receiving terminal and one second electric current receiving terminal, be used for the voltage that receives according to this positive input terminal and this negative input end, export corresponding electric current I d1, Id2 to described output-stage circuit by this first current output terminal and this second current output terminal, and receive electric current I d3, the Id4 that described output-stage circuit is exported by this first electric current receiving terminal and this second electric current receiving terminal; Described output-stage circuit, be coupled to this first current output terminal, this second current output terminal, this first electric current receiving terminal and this second electric current receiving terminal, be used for electric current I d1, Id2, Id3 according to this first current output terminal, this second current output terminal, this first electric current receiving terminal and this second electric current receiving terminal, Id4 produces corresponding voltage; And described adjusting device, be coupled between described input stage circuit and the described output-stage circuit, be used for adjusting electric current I d3, Id4 that electric current I d1, Id2 that this first current output terminal and this second current output terminal export and this first electric current receiving terminal and this second electric current receiving terminal are received, with the influence of compensating migration voltage.
Description of drawings
Fig. 1 is the schematic diagram of a known operations amplifier 10.
Fig. 2 is the schematic diagram of input stage circuit 100 among Fig. 1.
But Fig. 3 is the schematic diagram of the operational amplifier 30 of one embodiment of the invention compensating migration voltage.
The functional block diagram of Fig. 4 displayed map 3 middle regulators 304.
Fig. 5 is the schematic diagram of the first current-mode digital to analog converter among Fig. 4.
Fig. 6 and Fig. 7 show the schematic diagram of embodiment of the invention operational amplifier 60 and 70 respectively.
But Fig. 8 is the schematic diagram of the track to track formula operational amplifier 80 of one embodiment of the invention compensating migration voltage.
Fig. 9 is the schematic diagram of input stage circuit 800 among Fig. 8.
The functional block diagram of Figure 10 displayed map 8 middle regulators 804.
Figure 11 is the schematic diagram of the first current-mode digital to analog converter among Figure 10.
The reference numeral explanation
10,30,60,70,80 operational amplifiers
100,300,600,700,800 input stage circuits
102,302,802 output-stage circuits
104,310,814 equivalent voltage sources
The Vp positive input terminal
The Vn negative input end
The Vo output
Id1, Id2, Id3, Id4 electric current
The Vos offset voltage
The Vc common-mode voltage
P1, P2, N1, N2 transistor
200 current sources
304,606,706,804 adjusting devices
306,806 first current output terminals
308,808 second current output terminals
The Vctrl controlling signal
400,900 first current-mode digital to analog converters
402,902 second current-mode digital to analog converters
404,904 control units
SW1～SWn, SWU1～SWUn, SWD1～SWDn switch
CS1～CSn, CSU1～CSUn, CSD1～CSDn current source
810 first electric current receiving terminals
812 second electric current receiving terminals
Embodiment
Please refer to Fig. 3, but Fig. 3 is the schematic diagram of the operational amplifier 30 of one embodiment of the invention compensating migration voltage.Operational amplifier 30 includes an input stage circuit 300, an output-stage circuit 302 and an adjusting device 304.After input stage circuit 300 receives voltage signal by a positive input terminal Vp and a negative input end Vn, export corresponding electric current I d1, Id2 to output-stage circuit 302 by one first current output terminal 306 and one second current output terminal 308.Output-stage circuit 302 electric current I d1, Id2 according to first current output terminal 306 and second current output terminal 308 amplify the result by an output end vo output voltage.In addition, in Fig. 3, an equivalent voltage source 310 is used for representing the imperfection (not being present on the side circuit) of operational amplifier 30, and the voltage Vos that it produced represents the offset voltage of operational amplifier 30.304 of adjusting devices are used for adjusting electric current I d1, the Id2 that first current output terminal 306 and second current output terminal 308 are exported, with the influence of compensating migration voltage.
Therefore, in operational amplifier 30, adjusting device 304 can be by adjusting electric current I d1, Id2, and compensation is because of the influence of the offset voltage that factor produced such as do not match of Semiconductor Physics characteristic, technology defect, assembly.For instance, if electric current I d1 is during greater than electric current I d2, adjusting device 304 can be drawn electric current or be outputed current to second current output terminal 308 by first current output terminal 306, makes electric current I d1 approximate electric current I d2.On the contrary, as electric current I d1 during less than electric current I d2, adjusting device 304 exportable electric current to the first current output terminals 306 or draw electric current by second current output terminal 308 are so that electric current I d1 approximates electric current I d2.In this case, when even operational amplifier 30 produces offset voltage because of factors such as Semiconductor Physics characteristic, technology defect, assembly do not match, the present invention need not change the design of input stage circuit 300 and output-stage circuit 302, can be by the influence of adjusting device 304 compensating migration voltages.
Please refer to Fig. 4, the functional block diagram of Fig. 4 displayed map 3 middle regulators 304.Adjusting device 304 comprises one first current-mode digital to analog converter 400, one second current-mode digital to analog converter 402 and a control unit 404.The first current-mode digital to analog converter 400 and the second current-mode digital to analog converter 402 are respectively coupled to first current output terminal 306 and second current output terminal 308, be used for the controlling signal Vctrl that exported according to control unit 404, by first current output terminal 306 and second current output terminal, 308 output or received currents.Control unit 404 can be according to the difference between current of first current output terminal 306 and second current output terminal 308, output controlling signal Vctrl passes through the size of current that second current output terminal 308 is exported or received to control the size of current and the second current-mode digital to analog converter 402 that the first current-mode digital to analog converter 400 export or receive by first current output terminal 306.Therefore, when operational amplifier 30 causes electric current I d1 and Id2 unequal because of offset voltage, control unit 404 can be controlled the first current-mode digital to analog converter 400 and the second current-mode digital to analog converter 402 by controlling signal Vctrl, input to the electric current of output-stage circuit 302 with adjustment, make electric current (Id1 ± dI) and (Id2 ± dI) equate.Thus, the influence that offset voltage caused is able to be compensated effectively.
What pay special attention to is, Fig. 4 only is the functional block diagram of adjusting device 304, and those skilled in the art can cooperate other assembly, designs the circuit with identical function.For instance, as shown in Figure 5, the first current-mode digital to analog converter 400 can be made up of switch SW 1～SWn and current source CS1～CSn.Switch SW 1～SWn can be according to controlling signal Vctrl, the binding of conducting first current output terminal 306 and corresponding current sources, thus adjust the size of current of drawing or exporting by first current output terminal 306.Therefore, when electric current I d1 and Id2 are unequal, control unit 404 controllable switch SW1～SWn, the binding of the specific current source and first current output terminal 306 among conducting current source CS1～CSn is so that electric current I d1 equates with Id2.
Therefore, in operational amplifier 30, adjusting device 304 adjustable current Id1 and Id2 make the electric current that flows into output-stage circuit 302 equate, with the influence of compensating migration voltage.Certainly, those skilled in the art can design suitable adjusting device 304 according to required input stage circuit.For instance, please refer to Fig. 6 and Fig. 7, Fig. 6 and Fig. 7 show the schematic diagram of embodiment of the invention operational amplifier 60 and 70 respectively. Operational amplifier 60 and 70 is all deriving of operational amplifier 30, wherein, the input stage circuit 600 of operational amplifier 60 is made up of P type metal-oxide semiconductor transistor P1, P2, the input stage circuit 700 of operational amplifier 70 then is made up of N type metal-oxide semiconductor transistor N1, N2, both adjustment units 606 and 706 first current-mode digital to analog converters 400 according to Fig. 5 are designed, and its operation principles as previously mentioned.For instance, be example with operational amplifier 60, when some characteristic of transistor P1, P2 is not mated fully, can cause the threshold voltage of transistor P1, P2 unequal, thereby cause electric current I d1 and Id2 unequal.In this case, adjustment unit 606 can pass through the firing current source, equates so that electric current I d1 levels off to Id2.
The embodiment of the operational amplifier 60 of Figure 6 and Figure 7 and 70 for being derived according to operational amplifier 30, but not in order to limit covering scope of the present invention, the designer can do suitable variation.For example, the current source number in the adjustment unit 606 and 706 can be according to required accuracy adjustment, and the electric current that each current source produced can be made as unanimity or stepped successively decreases etc.
In addition, for track to track formula operational amplifier, the present invention provides an embodiment in addition, in order to the influence of compensating migration voltage.Please refer to Fig. 8, but Fig. 8 is the schematic diagram of the track to track formula operational amplifier 80 of embodiment of the invention compensating migration voltage.Track to track formula operational amplifier 80 includes an input stage circuit 800, an output-stage circuit 802 and an adjusting device 804.After input stage circuit 800 receives voltage signal by a positive input terminal Vp and a negative input end Vn, export corresponding electric current I d1, Id2 to output-stage circuit 802 by one first current output terminal 806 and one second current output terminal 808, and receive electric current I d3, the Id4 that output-stage circuits 302 are exported by one first electric current receiving terminal 810 and one second electric current receiving terminal 812.Output-stage circuit 802 electric current I d1, Id2, Id3, Id4 according to first current output terminal 806, second current output terminal 808, the first electric current receiving terminal 810 or the second electric current receiving terminal 812 amplify the result by an output end vo output voltage.In addition, in Fig. 8, an equivalent voltage source 814 is used for representing the imperfection (not being present on the side circuit) of track to track formula operational amplifier 80, and the voltage Vos that it produced represents the offset voltage of track to track formula operational amplifier 80.Adjusting device 804 is used for adjusting electric current I d3, the Id4 that electric current I d1, Id2 that first current output terminal 806, second current output terminal 808 exported or the first electric current receiving terminal 810, the second electric current receiving terminal 812 are received, with the influence of compensating migration voltage.
Track to track formula operational amplifier 80 function modes are similar to operational amplifier 30, difference be track to track formula operational amplifier 80 than operational amplifier more than 30 the first electric current receiving terminal 810 and the second electric current receiving terminal 812, be used for receiving electric current I d3, the Id4 that output-stage circuit 802 is exported.Therefore, as long as, can compensate the offset voltage of track to track formula operational amplifier 80 with after operational amplifier 30 suitable the modifications.
At first, please refer to Fig. 9, Fig. 9 is the schematic diagram of input stage circuit 800.Input stage circuit 800 comprises differential to reaching differential right that N type metal-oxide semiconductor transistor N1, N2 are formed that P type metal-oxide semiconductor transistor P1, P2 are formed.What transistor P1, P2 were formed is differential to passing through first current output terminal 806 and second current output terminal, 808 output current Id1, Id2 to output-stage circuit 802, and what transistor N1, N2 were formed is differential to then receiving electric current I d3, the Id4 that output-stage circuits 802 are exported by the first electric current receiving terminal 810 and the second electric current receiving terminal 812.
Please continue with reference to Figure 10, Figure 10 is the schematic diagram of adjusting device 804.As adjusting device shown in Figure 4 304, adjusting device 804 also comprises one first current-mode digital to analog converter 900, one second current-mode digital to analog converter 902 and a control unit 904.The first current-mode digital to analog converter 900 is coupled between first current output terminal 806 and the first electric current receiving terminal 810, in order to the controlling signal Vctrl that is exported according to control unit 904, by first current output terminal, 806 output currents and by the first electric current receiving terminal, 810 received currents.902 of the second current-mode digital to analog converters are coupled between second current output terminal 808 and the second electric current receiving terminal 812, in order to the controlling signal Vctrl that is exported according to control unit 904, by second current output terminal, 808 output currents and by the second electric current receiving terminal, 812 received currents.Therefore, when track to track formula operational amplifier 80 causes electric current I d1 and Id2 and Id3 and Id4 unequal because of offset voltage, control unit 904 can be controlled the first current-mode digital to analog converter 900 and the second current-mode digital to analog converter 902 by controlling signal Vctrl, input to the electric current of output-stage circuit 802 with adjustment, and input to the electric current of input stage circuit 800.Thus, the influence that offset voltage caused is able to be compensated effectively.
Certainly, adjusting device 804 can be any circuit with identical function, and those skilled in the art can cooperate other assembly, and the circuit of identical function is provided in design.For instance, as shown in figure 11, the first current-mode digital to analog converter 900 can be made up of switch SW U1～SWUn, SWD1～SWDn and current source CSU1～CSUn, CSD1～CSDn.Switch SW U1～SWUn can be according to controlling signal Vctrl, the binding of conducting first current output terminal 806 and corresponding current sources, thus adjust the size of current that input stage circuit 800 is exported by first current output terminal 806; Switch SW D1～SWDn then can be according to controlling signal Vctrl, the binding of conducting first electric current receiving terminal 810 and corresponding current sources, thus adjust the size of current that input stage circuit 800 is received by the first electric current receiving terminal 810.Similarly, the framework that the second current-mode digital to analog converter 902 can also be shown in Figure 11 is realized.Thus, control unit 904 can be by output controlling signal Vctrl, Id1 is equaled or levels off to Id2, and Id3 equals or levels off to Id4, and then the influence that offset voltage caused is able to be compensated effectively.Certainly, the number of current source CSU1～CSUn, CSD1～CSDn can be according to required accuracy adjustment, and the electric current that each current source produced can be made as unanimity or stepped successively decreases etc.
In sum, the present invention is by the size of current between input stage circuit and output-stage circuit in the adjustment operational amplifier, with the influence that compensating migration voltage was caused.Therefore, need not change input stage circuit and output-stage circuit, the present invention gets final product the influence that compensating migration voltage caused, thereby improves circuit performance.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (25)
1. but the operational amplifier of a compensating migration voltage includes:
One input stage circuit, include a positive input terminal, a negative input end, one first current output terminal and one second current output terminal, be used for the voltage that receives according to this positive input terminal and this negative input end, by this first current output terminal and the corresponding electric current of this second current output terminal output;
One output-stage circuit is coupled to this first current output terminal and this second current output terminal of this input stage circuit, is used for electric current according to this first current output terminal and this second current output terminal, output voltage; And
One adjusting device is coupled between this input stage circuit and this output-stage circuit, is used for adjusting the electric current of this first current output terminal and this second current output terminal, with the influence of compensating migration voltage.
2. operational amplifier as claimed in claim 1, wherein this input stage circuit includes:
One current source;
One the first transistor includes a drain electrode, is coupled to this first current output terminal, and one source pole is coupled to this current source, and a grid, is coupled to this positive input terminal; And
One transistor seconds includes a drain electrode, is coupled to this second current output terminal, and one source pole is coupled to this current source, and a grid, is coupled to this negative input end.
3. operational amplifier as claimed in claim 2, wherein this first transistor and this transistor seconds are all P type metal-oxide semiconductor transistor.
4. operational amplifier as claimed in claim 2, wherein this first transistor and this transistor seconds are all N type metal-oxide semiconductor transistor.
5. operational amplifier as claimed in claim 1, wherein this adjusting device includes:
One first current-mode digital to analog converter is coupled to this first current output terminal, is used for according to a controlling signal, by this output of first current output terminal or received current;
One second current-mode digital to analog converter is coupled to this second current output terminal, is used for according to this controlling signal, by this output of second current output terminal or received current; And
One control unit, be coupled to this first current-mode digital to analog converter and this second current-mode digital to analog converter, be used for difference between current according to this first current output terminal and this second current output terminal, export this controlling signal, to control the size of current that size of current that this first current-mode digital to analog converter exports or receive by this first current output terminal and this second current-mode digital to analog converter are exported or received by this second current output terminal.
6. operational amplifier as claimed in claim 5, wherein this first current-mode digital to analog converter includes:
A plurality of current sources; And
A plurality of switches, each switch includes one first end and is coupled to this first current output terminal, one second end is coupled to this control unit, and one the 3rd end is coupled to a current source of these a plurality of current sources, be used for this controlling signal of being received according to this second end, control of the binding of this first end to the 3rd end.
7. operational amplifier as claimed in claim 6, wherein the size of current exported of this a plurality of current source is all identical.
8. operational amplifier as claimed in claim 6, wherein the size of current exported of this a plurality of current source is step relation.
9. operational amplifier as claimed in claim 5, wherein this second current-mode digital to analog converter includes:
A plurality of current sources; And
A plurality of switches, each switch includes one first end and is coupled to this second current output terminal, one second end is coupled to this control unit, and one the 3rd end is coupled to a current source of these a plurality of current sources, be used for this controlling signal of being received according to this second end, control of the binding of this first end to the 3rd end.
10. operational amplifier as claimed in claim 9, wherein the size of current exported of this a plurality of current source is all identical.
11. operational amplifier as claimed in claim 9, wherein the size of current exported of this a plurality of current source is step relation.
12. but the track to track formula operational amplifier of a compensating migration voltage includes:
One input stage circuit, an output-stage circuit and an adjusting device;
Wherein, described input stage circuit includes a positive input terminal, a negative input end, one first current output terminal, one second current output terminal, one first electric current receiving terminal and one second electric current receiving terminal, be used for the voltage that receives according to this positive input terminal and this negative input end, by this first current output terminal and the corresponding electric current (Id1 of this second current output terminal output, Id2) to described output-stage circuit, and by this first electric current receiving terminal and this second electric current receiving terminal receive the electric current that described output-stage circuit exports (Id3, Id4);
Described output-stage circuit, be coupled to this first current output terminal, this second current output terminal, this first electric current receiving terminal and this second electric current receiving terminal, be used for electric current (Id1 according to this first current output terminal, this second current output terminal, this first electric current receiving terminal or this second electric current receiving terminal, Id2, Id3, Id4), produce corresponding voltage; And
Described adjusting device, be coupled between described input stage circuit and the described output-stage circuit, be used for adjusting the electric current (Id1 that this first current output terminal or this second current output terminal are exported, Id2) and the electric current (Id3 that received of this first electric current receiving terminal or this second electric current receiving terminal, Id4), with the influence of compensating migration voltage.
13. track to track formula operational amplifier as claimed in claim 12, wherein this input stage circuit includes:
One first current source;
One the first transistor includes a drain electrode, is coupled to this first current output terminal, and one source pole is coupled to this first current source, and a grid, is coupled to this positive input terminal;
One transistor seconds includes a drain electrode, is coupled to this second current output terminal, and one source pole is coupled to this first current source, and a grid, is coupled to this negative input end;
One second current source;
One the 3rd transistor includes a drain electrode, is coupled to this first electric current receiving terminal, and one source pole is coupled to this second current source, and a grid, is coupled to this positive input terminal; And
One the 4th transistor includes a drain electrode, is coupled to this second electric current receiving terminal, and one source pole is coupled to this second current source, and a grid, is coupled to this negative input end.
14. track to track formula operational amplifier as claimed in claim 13, wherein this first transistor and this transistor seconds are all P type metal-oxide semiconductor transistor, and the 3rd transistor AND gate the 4th transistor is all N type metal-oxide semiconductor transistor.
15. track to track formula operational amplifier as claimed in claim 12, wherein this adjusting device includes:
One first current-mode digital to analog converter is coupled between this first current output terminal and this first electric current receiving terminal, is used for according to a controlling signal, by this first current output terminal and output of this first electric current receiving terminal or received current;
One second current-mode digital to analog converter is coupled between this second current output terminal and this second electric current receiving terminal, is used for according to this controlling signal, by this second current output terminal and output of this second electric current receiving terminal or received current; And
One control unit, be coupled to this first current-mode digital to analog converter and this second current-mode digital to analog converter, be used for according to the difference between current of this first current output terminal and this second current output terminal and the difference between current of this first electric current receiving terminal and this second electric current receiving terminal, export this controlling signal, to control the size of current that size of current that this first current-mode digital to analog converter exports or receive by this first current output terminal and this first electric current receiving terminal and this second current-mode digital to analog converter are exported or received by this second current output terminal and this second electric current receiving terminal.
16. track to track formula operational amplifier as claimed in claim 15, wherein this first current-mode digital to analog converter includes:
A plurality of first current sources;
A plurality of first switches, each first switch includes one first end and is coupled to this first current output terminal, one second end is coupled to this control unit, and one the 3rd end is coupled to one first current source of these a plurality of first current sources, be used for this controlling signal of being received according to this second end, control of the binding of this first end to the 3rd end;
A plurality of second current sources;
A plurality of second switches, each second switch includes one first end and is coupled to this first electric current receiving terminal, one second end is coupled to this control unit, and one the 3rd end is coupled to one second current source of these a plurality of second current sources, be used for this controlling signal of being received according to this second end, control of the binding of this first end to the 3rd end.
17. track to track formula operational amplifier as claimed in claim 16, wherein the size of current exported of these a plurality of first current sources is all identical.
18. track to track formula operational amplifier as claimed in claim 16, wherein the size of current exported of these a plurality of first current sources is step relation.
19. track to track formula operational amplifier as claimed in claim 16, wherein the size of current exported of these a plurality of second current sources is all identical.
20. track to track formula operational amplifier as claimed in claim 16, wherein the size of current exported of these a plurality of second current sources is step relation.
21. track to track formula operational amplifier as claimed in claim 15, wherein this second current-mode digital to analog converter includes:
A plurality of first current sources;
A plurality of first switches, each first switch includes one first end and is coupled to this second current output terminal, one second end is coupled to this control unit, and one the 3rd end is coupled to one first current source of these a plurality of first current sources, be used for this controlling signal of being received according to this second end, control of the binding of this first end to the 3rd end;
A plurality of second current sources;
A plurality of second switches, each second switch includes one first end and is coupled to this second electric current receiving terminal, one second end is coupled to this control unit, and one the 3rd end is coupled to one second current source of these a plurality of second current sources, be used for this controlling signal of being received according to this second end, control of the binding of this first end to the 3rd end.
22. track to track formula operational amplifier as claimed in claim 21, wherein the size of current exported of these a plurality of first current sources is all identical.
23. track to track formula operational amplifier as claimed in claim 21, wherein the size of current exported of these a plurality of first current sources is step relation.
24. track to track formula operational amplifier as claimed in claim 21, wherein the size of current exported of these a plurality of second current sources is all identical.
25. track to track formula operational amplifier as claimed in claim 21, wherein the size of current exported of these a plurality of second current sources is step relation.
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| CN101840724B (en) * | 2009-03-18 | 2013-05-08 | 南亚科技股份有限公司 | Signal receiver and related voltage compensation method thereof |
| CN102053195B (en) * | 2010-10-15 | 2013-04-24 | 艾默生网络能源有限公司 | Current sampling system and method for calculating offset voltage of operational amplifier |
| TWI577153B (en) * | 2015-10-08 | 2017-04-01 | 九暘電子股份有限公司 | A Gain Apparatus for Power Sourcing Equipment of Power over Ethernet |
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|---|---|---|---|---|
| US5041794A (en) * | 1990-11-21 | 1991-08-20 | Analogic Corporation | Voltage to current conversion switching system |
| US6426674B1 (en) * | 1999-04-28 | 2002-07-30 | Stmicroelectronics S.A. | Circuit and method for compensating an offset voltage in an operational amplifier |
| CN1606236A (en) * | 2001-02-01 | 2005-04-13 | 富士通株式会社 | DC offset cancellation circuit, differential amplification circuit, photo-electric pulse conversion circuit |
-
2007
- 2007-03-29 CN CN200710088999A patent/CN101277094B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5041794A (en) * | 1990-11-21 | 1991-08-20 | Analogic Corporation | Voltage to current conversion switching system |
| US6426674B1 (en) * | 1999-04-28 | 2002-07-30 | Stmicroelectronics S.A. | Circuit and method for compensating an offset voltage in an operational amplifier |
| CN1606236A (en) * | 2001-02-01 | 2005-04-13 | 富士通株式会社 | DC offset cancellation circuit, differential amplification circuit, photo-electric pulse conversion circuit |
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| Publication number | Publication date |
|---|---|
| CN101277094A (en) | 2008-10-01 |
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