CN101119103A - Device for correcting input offset voltage - Google Patents
Device for correcting input offset voltage Download PDFInfo
- Publication number
- CN101119103A CN101119103A CNA2006100991955A CN200610099195A CN101119103A CN 101119103 A CN101119103 A CN 101119103A CN A2006100991955 A CNA2006100991955 A CN A2006100991955A CN 200610099195 A CN200610099195 A CN 200610099195A CN 101119103 A CN101119103 A CN 101119103A
- Authority
- CN
- China
- Prior art keywords
- switch
- offset voltage
- mode
- operational amplifier
- input offset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000872 buffer Substances 0.000 claims abstract description 36
- 238000010586 diagram Methods 0.000 description 14
- 238000009342 intercropping Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Landscapes
- Amplifiers (AREA)
Abstract
The present invention is an input offset voltage adjusting device used in operational amplifier. The invention is characterized in comprising a switch element, a buffer element, an offset voltage adjusting element and a micro control element. The technical proposal of the present invention is that the micro control element controls the switch element through the buffer element, and the different operation modes are switched by the switch element. The input offset voltage of the operational amplifier is adjusted by the offset voltage adjusting element when the input offset voltage adjusting device is under the offset voltage adjusting mode to input more accurate signal. Besides, the present invention can adjust the offset voltage at any time according to the work environment in order to maintain the best performance of the operational amplifier.
Description
Technical field
The present invention relates to a kind of device of proofreading and correct input off-set voltage, particularly a kind of means for correcting that is used to adjust the input off-set voltage of operational amplifier.
Background technology
Input off-set voltage is in order to allow the static direct current output voltage equal zero or certain default value, and must be added in the direct voltage of input.If the input stage ideal symmetrical of operational amplifier, transistor are also mated fully, then input off-set voltage equals zero.But be subjected to the influence of manufacture process variation, the geometry on the chip and mix must not be tally in every detail, so all operational amplifiers all need add very little voltage between anti-phase and non-inverting input, so that remedy not matching between them.
So general when the characteristic of application comparator exclusive disjunction amplifier, input off-set voltage is for needing one of important parameter of considering.The size of input off-set voltage will influence the working point that direct current amplifies, the maximum amplification times yield during application, and the error after the signal amplification etc.See also the circuit diagram of the non-return amplifying circuit of Fig. 1.As shown be the application circuit that utilizes operational amplifier 10 to make an amplifier, if wherein first resistance R 1 is 1k Ω, second resistance R 2 is 99k Ω, and then the enlargement ratio of non-return amplifying circuit is 100 times.And the output Vo of operational amplifier 10 equals to be multiplied by 100 (Vo=(Vin+Vio) * 100) after input voltage vin adds input off-set voltage Vio.Can be found that by above-mentioned formula the input voltage vin of amplifying except desire is exaggerated 100 times, input off-set voltage Vio also has been exaggerated 100 times.So when circuit design, need consider the size of input off-set voltage Vio, as far as possible with input off-set voltage Vio design or be adjusted to minimum, in order to avoid too high input off-set voltage Vio causes the output Vo error of operational amplifier 10 excessive, or cause the saturated phenomenon of operational amplifier 10.
Please consult the circuit diagram of Fig. 2 current-sensing circuit again.As shown be the application circuit that utilizes operational amplifier 10 to make a comparator, wherein if this current detected I of circuit institute scope between 0A～20A, and utilizes an analog-digital converter 21 that current signal is read in micro-control unit 31.I ranges up to 20A because of detecting current, and for reducing power consumption, employed current sense resistance R 3 is 10m Ω/5W.So formed voltage swing is 0.2V on the current sense resistance R 3, formed voltage is through the coupling of the 5th resistance R 5 of the 4th resistance R 4 of 1k Ω and 24k Ω and after amplifying 25 times on the current sense resistance R 3, in the voltage of the output output 0～5V of operational amplifier 10.Yet, if the input off-set voltage Vio of operational amplifier 10 be ± during 30mV, the current value error that micro-control unit 31 is read through analog-digital converter 21 will be up to ± 3A (30mV/10m Ω), its error rate is 15%.So the size of the input off-set voltage Vio of operational amplifier 10 can influence the accuracy of micro-control unit 31 current value that reads.
At general micro-control unit semiconductor fabrication, wherein the input off-set voltage of operational amplifier is about about ± 30mV, if will design a low input offset comparator or an amplifier, generally all need use test to adjust mode (trim), or employing is switched relatively, and the mode of (chopper) design.Yet utilize test adjustment mode to proofread and correct input off-set voltage, the result of its correction is ability guaranteed performance under the environment of timing only, because input off-set voltage can the drift with operating voltage, working temperature and input voltage difference.So if reconnaissance examination adjustment mode is proofreaied and correct input off-set voltage, in case the operational environment difference, the characteristic of its operational amplifier will variation, causes error to become big.And if adopt the relatively mode of (chopper) of switching, its circuit will need extra clock circuit and filter, thus will cause that circuit cost is higher, work bandwidth can't promote and the circuit reaction speed slow and can't be fit to the shortcomings such as application of high-speed comparator or amplifier.
Summary of the invention
In view of this, the present invention uses micro-control unit to set buffer, controls for this reason and activates the related switch circuit, and it is minimum that operational amplifier can be corrected to the input off-set voltage of working point, and can change correction at any time according to operational environment, to keep optkmal characteristics.
The invention provides a kind of device for correcting input offset voltage, be used to adjust the input off-set voltage of an operational amplifier, it is characterized in that device comprises a buffer memory unit, a micro-control unit, a switch element and an offset voltage adjustment unit.And buffer memory unit is used for a temporary mode of operation switching signal, and sets this mode of operation switching signal by micro-control unit.The output of its operational amplifier is connected in micro-control unit.Switch element is located between a signal input part and operational amplifier, switches the mode of operation of device for correcting input offset voltage according to the mode of operation switching signal.Above-mentioned mode of operation comprises a normal mode of operation and an offset voltage correction pattern, and the offset voltage correction pattern also comprises an anode correction mode and a negative terminal correction mode.Its each mode of operation is decided by the action of each switch room in the switch element, and the action of each switch room is moved according to the mode of operation switching signal in the buffer memory unit in the switch element.Last offset voltage adjustment unit is used to adjust the input off-set voltage of operational amplifier when device for correcting input offset voltage works in the offset voltage correction pattern.
And device for correcting input offset voltage of the present invention can utilize micro-control unit to proofread and correct input off-set voltage at any time, can improve reconnaissance examination adjustment mode and proofread and correct input off-set voltage, and in the operational environment difference, the characteristic of its operational amplifier will variation, causes error to become big disappearance.And by the design of offset voltage adjustment unit (increasing the figure place of adjustment), can more accurate adjustment input off-set voltage to minimum scope, effectively promote the application of operational amplifier characteristic.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the circuit diagram of non-return amplifying circuit;
Fig. 2 is the circuit diagram of current-sensing circuit;
Fig. 3 is the functional block diagram of device for correcting input offset voltage of the present invention;
Fig. 3 A is the preferred embodiment circuit diagram of offset voltage adjustment unit;
Fig. 4 is the functional block diagram of device for correcting input offset voltage preferred embodiment of the present invention;
Fig. 5 is the functional block diagram of device for correcting input offset voltage preferred embodiment of the present invention; And
Fig. 6 is the functional block diagram of device for correcting input offset voltage preferred embodiment of the present invention.
Wherein, Reference numeral
I detecting current Vo output
Vin input voltage Vio input off-set voltage
R1 first resistance R 2 second resistance
R3 current sense resistance R 4 the 4th resistance
R5 the 5th resistance 10,30 operational amplifiers
21 analog-digital converters, 31 micro-control units
32 buffer memory units, 321 first buffers
322 second buffers, 33 offset voltage adjustment units
34 switch elements, 341 first switches
342 second switches 343 the 3rd switch
35 signal input parts
Embodiment
See also the functional block diagram of Fig. 3 for device for correcting input offset voltage of the present invention.Device for correcting input offset voltage comprises a buffer memory unit 32, a micro-control unit 31, a switch element 34 and an offset voltage adjustment unit 33, is used for the input off-set voltage of adjustment operational amplifier 30.The signal of signal input part 35 inputs is sent to operational amplifier 30 through switch element 34, and this signal just exports micro-control unit 31 to by operational amplifier 30 after treatment and uses.For solving the influence that input off-set voltage caused of operational amplifier 30, micro-control unit 31 will be set the mode of operation switching signal in buffer memory unit 32, with control switch unit 34 device for correcting input offset voltage be switched in a normal mode of operation and an offset voltage correction pattern intercropping.When device for correcting input offset voltage during in an offset voltage correction pattern, then offset voltage adjustment unit 33 just is adjusted to minimum scope with the input off-set voltage of operational amplifier 30.
See also Fig. 3 A, be the preferred embodiment circuit diagram of offset voltage adjustment unit.As shown in the figure, between operational amplifier positive input section and negative input end, come control switch S1, S2, S3... to Sn,, input off-set voltage is adjusted to minimum scope to adjust the input off-set voltage of operational amplifier 30 by a control circuit 331.
Yet the figure place of offset voltage adjustment unit 33 is many more, and its adjustable input off-set voltage minimum zone can be more little, so input off-set voltage can be more little to the influence of operational amplifier 30 application characteristics.Moreover above-mentioned offset voltage correction pattern comprises an anode correction mode and a negative terminal correction mode, the required design in the time of can using for operational amplifier 30.And the switching between an anode correction mode and a negative terminal correction mode, as the switching between normal mode of operation and offset voltage correction pattern, set the mode of operation switching signal of buffer memory unit 32 by micro-control unit 31, and switch element 34 is carried out corresponding switch motion according to the mode of operation switching signal in the buffer memory unit 32 again, so that device for correcting input offset voltage is activated in the mode of operation that micro-control unit 31 sets.
Only could guaranteed performance under the environment of timing for fear of the result who proofreaies and correct, micro-control unit 31 also can be provided with a timing module (figure does not show), its timing module is used to provide a calibration cycle, mode of operation switching signal in certain cycle setting buffer memory unit 32, so that device for correcting input offset voltage is activated in the offset voltage correction pattern, and carry out the adjustment of input off-set voltage.
See also the functional block diagram of Fig. 4 device for correcting input offset voltage preferred embodiment of the present invention.Signal input part 35 comprises a positive signal input and a negative signal input as shown in the figure.Switch element 34 comprises one first switch 341, second switch 342 and the 3rd switch 343.And buffer memory unit 32 comprises first buffer 321 and second buffer 322.Wherein an end of first switch 341 is connected in the positive signal input, and the other end of first switch 341 is connected in the anode of operational amplifier 30.One end of second switch 342 is connected in the negative signal input, and the other end of second switch 342 is connected in the negative terminal of operational amplifier 30.And an end of the 3rd switch 343 system is connected in the anode of first switch 341 and operational amplifier 30, and the other end of the 3rd switch 343 is connected in the negative terminal of second switch 342 and operational amplifier 30.
Explanation at above-mentioned Fig. 3 is mentioned, the mode of operation switching signal that buffer memory unit 32 temporary micro-control units 31 set.And the mode of operation switching signal comprises the mode of operation switching signal of switching normal mode of operation and offset voltage correction pattern, be temporary in first buffer 321, and the mode of operation switching signal of switching anode correction mode and negative terminal correction mode, be temporary in second buffer 322.Its first switch 341, second switch 342 and the 3rd switch 343 are done switch motion according to the temporary mode of operation switching signal of first buffer 321 and second buffer 342, device for correcting input offset voltage being activated, even be anode correction mode or negative terminal correction mode in the offset voltage correction pattern in normal mode of operation or offset voltage correction pattern.And when the offset voltage correction device activated in the offset voltage correction pattern, offset voltage adjustment unit 33 just was used to adjust the input off-set voltage of operational amplifier 30, to keep the application of operational amplifier 30 preferable characteristics.
Yet, if each switch in the switch element 34 makes first switch 341 and second switch 342 be closure state (on) according to the mode of operation switching signal, the state (off) of the 3rd switch 343 for disconnecting, then the mode of operation of device for correcting input offset voltage is a normal mode of operation.If it is 343 closure states (on) that each switch in the switch element 34 makes first switch 341 and the 3rd switch according to the mode of operation switching signal, the state (off) of second switch 342 for disconnecting, then the mode of operation of device for correcting input offset voltage is an anode correction mode.If each switch in the switch element 34 makes second switch 342 and the 3rd switch 343 be closure state (on) according to the mode of operation switching signal, the state (off) of first switch 341 for disconnecting, then the mode of operation of device for correcting input offset voltage is a negative terminal correction mode.The visual application circuit of user is required, by the conversion between micro-control unit 31 each pattern of setting, input off-set voltage is done suitable adjustment.
See also the functional block diagram of Fig. 5 device for correcting input offset voltage preferred embodiment of the present invention.The embodiment of Fig. 5 is the input off-set voltage that can be used for operational amplifier 30, and its correction mode is the application that negative terminal is proofreaied and correct.Its relevant operating principle is identical with the embodiment of Fig. 4, thus repeat no more, and present embodiment is at utilizing switch element 34 to come the method for switching working mode to be described further.
And micro-control unit 31 is after buffer memory unit 32 is set the mode of operation switching signal, as if the mode of operation switching signal of being kept in according to buffer memory unit 32, make first switch 341 be closure state (on), the state (off) of the 3rd switch 343 for disconnecting, then the mode of operation of device for correcting input offset voltage is a normal mode of operation.If make first switch 341 be off-state (off) according to the mode of operation switching signal, the 3rd switch 343 is closed state (on), and then the mode of operation of device for correcting input offset voltage is a negative terminal correction mode.
So utilize micro-control unit 31 to set the temporary signal of buffer unit 32,, device for correcting input offset voltage can be switched in normal mode of operation and the intercropping of negative terminal correction mode with the action of control switch unit 34.
See also the functional block diagram of Fig. 6 device for correcting input offset voltage preferred embodiment of the present invention.The embodiment of Fig. 6 is the input off-set voltage that can be used for operational amplifier 30, and its correction mode is the application that anode is proofreaied and correct.Its relevant operating principle is identical with the embodiment of Fig. 4, thus repeat no more, and present embodiment is at utilizing switch element 34 to come the method for switching working mode to be described further.
And micro-control unit 31 is after buffer memory unit 32 is set the mode of operation switching signal, as if the mode of operation switching signal of being kept in according to buffer memory unit 32, make second switch 342 be closure state (on), the state (off) of the 3rd switch 343 for disconnecting, then the mode of operation of device for correcting input offset voltage is a normal mode of operation.If make second switch 342 be off-state (off) according to the mode of operation switching signal, the 3rd switch 343 is closed state (on), and then the mode of operation of device for correcting input offset voltage is an anode correction mode.
So utilize micro-control unit 31 to set the temporary signal of buffer unit 32,, device for correcting input offset voltage can be switched in normal mode of operation and the intercropping of anode correction mode with the action of control switch unit 34.
In sum, utilize the effectively input off-set voltage of correction calculation amplifier 30 of device for correcting input offset voltage of the present invention, so when operational amplifier 30 is applied to the circuit of amplifier or comparator, can reduce input off-set voltage greatly to influence that application circuit brought.
Certainly; this is brightly also other various embodiments can be arranged; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (19)
1. device for correcting input offset voltage is used to proofread and correct the input off-set voltage of an operational amplifier, it is characterized in that this device comprises:
One buffer memory unit is used for a temporary mode of operation switching signal;
One micro-control unit is connected in the output of this operational amplifier, is used to set this mode of operation switching signal;
One switch element is located between a signal input part and this operational amplifier, switches the mode of operation of this device for correcting input offset voltage according to this mode of operation switching signal; And
One offset voltage adjustment unit is adjusted the input off-set voltage of this operational amplifier according to this mode of operation switching signal.
2. device for correcting input offset voltage according to claim 1 is characterized in that, the mode of operation of this device for correcting input offset voltage comprises a normal mode of operation and an offset voltage correction pattern.
3. device for correcting input offset voltage according to claim 2 is characterized in that, this offset voltage correction pattern comprises an anode correction mode and a negative terminal correction mode.
4. device for correcting input offset voltage according to claim 1 is characterized in that, this buffer memory unit also comprises one first buffer, is used for temporary this mode of operation switching signal of switching this normal mode of operation and this offset voltage correction pattern.
5. device for correcting input offset voltage according to claim 4 is characterized in that, this buffer memory unit also comprises one second buffer, is used for temporary this mode of operation switching signal of switching this anode correction mode and this negative terminal correction mode.
6. device for correcting input offset voltage according to claim 1 is characterized in that, this switch element also comprises:
One first switch is connected between the anode of the positive signal input of this signal input part and this operational amplifier;
One second switch is connected between the negative terminal of the negative signal input of this signal input part and this operational amplifier; And
One the 3rd switch, an end of the 3rd switch is connected in the anode of this first switch and this operational amplifier, and the other end of the 3rd switch is connected in the negative terminal of this second switch and this operational amplifier.
7. device for correcting input offset voltage according to claim 6, it is characterized in that, it is closure state that this switch element makes this first switch and this second switch according to this mode of operation switching signal, the state of the 3rd switch for disconnecting, then the mode of operation of this device for correcting input offset voltage is a normal mode of operation.
8. device for correcting input offset voltage according to claim 6, it is characterized in that, it is closure state that this switch element makes this first switch and the 3rd switch according to this mode of operation switching signal, the state of this second switch for disconnecting, then the mode of operation of this device for correcting input offset voltage is an anode correction mode.
9. device for correcting input offset voltage according to claim 6, it is characterized in that, it is closure state that this switch element makes this second switch and the 3rd switch according to this mode of operation switching signal, the state of this first switch for disconnecting, then the mode of operation of this device for correcting input offset voltage is a negative terminal correction mode.
10. device for correcting input offset voltage according to claim 1 is characterized in that, the offset voltage adjustment unit that this offset voltage adjustment unit is a digital element, and with the minimum input off-set voltage that is adjusted to of this operational amplifier.
11. device for correcting input offset voltage according to claim 1 is characterized in that, this switch element also comprises:
One first switch is connected between the anode of the positive signal input of this signal input part and this operational amplifier; And
One the 3rd switch, an end of the 3rd switch is connected in the anode of this first switch and this operational amplifier, and the other end of the 3rd switch is connected in the negative signal input of this signal input part and the negative terminal of this operational amplifier.
12. device for correcting input offset voltage according to claim 11, it is characterized in that, making this first switch according to this mode of operation switching signal is closure state, the state of the 3rd switch for disconnecting, and then the mode of operation of this device for correcting input offset voltage is a normal mode of operation.
13. device for correcting input offset voltage according to claim 11, it is characterized in that, making this first switch according to this mode of operation switching signal is off-state, and the 3rd switch is closed state, and then the mode of operation of this device for correcting input offset voltage is a negative terminal correction mode.
14. device for correcting input offset voltage according to claim 1 is characterized in that, this switch element also comprises:
One second switch is connected between the negative terminal of the negative signal input of this signal input part and this operational amplifier; And
One the 3rd switch, an end of the 3rd switch is connected in the negative terminal of this second switch and this operational amplifier, and the other end of the 3rd switch is connected in the positive signal input of this signal input part and the anode of this operational amplifier.
15. device for correcting input offset voltage according to claim 14, it is characterized in that, making this second switch according to this mode of operation switching signal is closure state, the state of the 3rd switch for disconnecting, and then the mode of operation of this device for correcting input offset voltage is a normal mode of operation.
16. device for correcting input offset voltage according to claim 14, it is characterized in that, making this second switch according to this mode of operation switching signal is off-state, and the 3rd switch is closed state, and then the mode of operation of this device for correcting input offset voltage is an anode correction mode.
17. device for correcting input offset voltage according to claim 1 is characterized in that, this buffer memory unit is located in this micro-control unit.
18. device for correcting input offset voltage according to claim 1 is characterized in that, this device for correcting input offset voltage is applied to the circuit of a comparator.
19. device for correcting input offset voltage according to claim 1 is characterized in that, this device for correcting input offset voltage is applied to the circuit of an amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100991955A CN100488037C (en) | 2006-08-02 | 2006-08-02 | Device for correcting input offset voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100991955A CN100488037C (en) | 2006-08-02 | 2006-08-02 | Device for correcting input offset voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101119103A true CN101119103A (en) | 2008-02-06 |
| CN100488037C CN100488037C (en) | 2009-05-13 |
Family
ID=39055073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100991955A Active CN100488037C (en) | 2006-08-02 | 2006-08-02 | Device for correcting input offset voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100488037C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053195A (en) * | 2010-10-15 | 2011-05-11 | 艾默生网络能源有限公司 | Current sampling system and method for calculating offset voltage of operational amplifier |
| CN102647162A (en) * | 2011-02-16 | 2012-08-22 | 佳能株式会社 | Differential amplifyer |
| CN101552753B (en) * | 2008-03-31 | 2012-12-26 | 晨星半导体股份有限公司 | DC offset correction circuit of wireless communication device and correction method thereof |
| CN104009806A (en) * | 2014-05-08 | 2014-08-27 | 青岛海信宽带多媒体技术有限公司 | Optical receiver sensitivity adjusting device |
| CN105305974A (en) * | 2014-07-10 | 2016-02-03 | 晶致半导体股份有限公司 | Driving device with correcting function and wireless charging driving system employing same |
| CN105375889A (en) * | 2014-08-19 | 2016-03-02 | 三重富士通半导体股份有限公司 | Operational amplifier input offset correction with transistor threshold voltage adjustment |
| CN105743446A (en) * | 2016-01-28 | 2016-07-06 | 芯海科技（深圳）股份有限公司 | Drift voltage correcting circuit for instrument amplifier |
| CN106100618A (en) * | 2016-06-06 | 2016-11-09 | 中航（重庆）微电子有限公司 | A kind of voltage offset correction device and method |
| CN106571785A (en) * | 2015-10-08 | 2017-04-19 | 九旸电子股份有限公司 | Gain circuit of power over Ethernet equipment |
-
2006
- 2006-08-02 CN CNB2006100991955A patent/CN100488037C/en active Active
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552753B (en) * | 2008-03-31 | 2012-12-26 | 晨星半导体股份有限公司 | DC offset correction circuit of wireless communication device and correction 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 |
| CN102053195A (en) * | 2010-10-15 | 2011-05-11 | 艾默生网络能源有限公司 | Current sampling system and method for calculating offset voltage of operational amplifier |
| CN102647162A (en) * | 2011-02-16 | 2012-08-22 | 佳能株式会社 | Differential amplifyer |
| CN102647162B (en) * | 2011-02-16 | 2015-01-28 | 佳能株式会社 | Differential amplifyer |
| CN104009806B (en) * | 2014-05-08 | 2017-01-11 | 青岛海信宽带多媒体技术有限公司 | Optical receiver sensitivity adjusting device |
| CN104009806A (en) * | 2014-05-08 | 2014-08-27 | 青岛海信宽带多媒体技术有限公司 | Optical receiver sensitivity adjusting device |
| CN105305974B (en) * | 2014-07-10 | 2018-03-23 | 晶致半导体股份有限公司 | The wireless charging drive system of drive device and its application with calibration function |
| CN105305974A (en) * | 2014-07-10 | 2016-02-03 | 晶致半导体股份有限公司 | Driving device with correcting function and wireless charging driving system employing same |
| CN105375889A (en) * | 2014-08-19 | 2016-03-02 | 三重富士通半导体股份有限公司 | Operational amplifier input offset correction with transistor threshold voltage adjustment |
| CN105375889B (en) * | 2014-08-19 | 2018-06-29 | 三重富士通半导体股份有限公司 | It is corrected using the operational amplifier input offset that transistor threshold voltage is adjusted |
| CN106571785A (en) * | 2015-10-08 | 2017-04-19 | 九旸电子股份有限公司 | Gain circuit of power over Ethernet equipment |
| CN106571785B (en) * | 2015-10-08 | 2018-11-20 | 九旸电子股份有限公司 | Gain circuit of power over Ethernet equipment |
| CN105743446A (en) * | 2016-01-28 | 2016-07-06 | 芯海科技（深圳）股份有限公司 | Drift voltage correcting circuit for instrument amplifier |
| CN105743446B (en) * | 2016-01-28 | 2018-12-18 | 芯海科技（深圳）股份有限公司 | A kind of drift voltage correcting circuit for instrument amplifier |
| CN106100618A (en) * | 2016-06-06 | 2016-11-09 | 中航（重庆）微电子有限公司 | A kind of voltage offset correction device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100488037C (en) | 2009-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100488037C (en) | Device for correcting input offset voltage | |
| CN107607770B (en) | Current sampling circuit, switch circuit and current sampling method | |
| KR102038428B1 (en) | Over-current detection circuit and method for power switch | |
| CN106712730B (en) | Signal-adjustable programmable gain amplifier | |
| JP2017526247A (en) | Current sensing circuit using single operational amplifier with DC offset auto-zeroing | |
| CN105242734B (en) | A kind of high power LD O circuit without external electric capacity | |
| JP2009291057A (en) | Current detection circuit and switching regulator with the current detection circuit | |
| CN106292824B (en) | Low-dropout regulator circuit | |
| CN111213389B (en) | Current measurement at the output of a switching amplifier | |
| KR101887156B1 (en) | Low switching error, small capacitors, auto-zero offset buffer amplifier | |
| US7190291B2 (en) | Programmable error amplifier for sensing voltage error in the feedback path of digitially programmable voltage sources | |
| EP2052456B1 (en) | Integrator and error amplifier | |
| US11050386B2 (en) | Inverse pseudo fully-differential amplifier having common-mode feedback control circuit | |
| CN111693758A (en) | Current sensing for monitoring load current in a buck power converter | |
| CN116388763B (en) | DAC compatible with voltage/current output | |
| CN115118237A (en) | Fully differential operational amplifier and fully differential operational amplifier circuit | |
| TW200822540A (en) | Conversion circuit for converting differential signal into single-phase signal | |
| CN116224033A (en) | Fast common mode detection circuit of full differential amplifier | |
| US9024603B2 (en) | Low power current comparator for switched mode regulator | |
| CN115328244A (en) | Upper clamping circuit of operational amplifier | |
| JP5186818B2 (en) | Chopper type comparator | |
| US7423478B2 (en) | Input offset voltage corrector | |
| CN114518486A (en) | Method and circuit for measuring input offset voltage | |
| US8416021B2 (en) | Amplifier circuit | |
| TWI344262B (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |