CN109830215B - Gamma correction circuit, gamma correction method, source electrode driving circuit and display panel - Google Patents
Gamma correction circuit, gamma correction method, source electrode driving circuit and display panel Download PDFInfo
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- CN109830215B CN109830215B CN201910126953.5A CN201910126953A CN109830215B CN 109830215 B CN109830215 B CN 109830215B CN 201910126953 A CN201910126953 A CN 201910126953A CN 109830215 B CN109830215 B CN 109830215B
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Abstract
The invention discloses a gamma correction circuit, a correction method, a source electrode drive circuit and a display panel, wherein the gamma correction circuit comprises: a first operational amplifier and a second operational amplifier; through the arrangement of the first operational amplifier and the second operational amplifier, the first output end is connected with the fourth input end, so that the influence of offset voltage of the operational amplifier on gamma voltage is eliminated in operation, the influence of the offset voltage on a circuit structure is eliminated, and the quality of a display picture is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a gamma correction circuit, a gamma correction method, a source electrode driving circuit and a display panel.
Background
The output end of a gamma circuit in a source electrode driving circuit used by the liquid crystal display panel at present needs to be connected with an operational amplifier, and the problem of voltage offset of the input end in the operational amplifier exists due to the internal structure of the operational amplifier.
In the related technology, the offset voltage of each input end of the operational amplifier is neutralized by switching the positive polarity and the negative polarity of the input end of the operational amplifier once in a frame, namely, the offset voltage is neutralized by adjusting the brightness of a picture, and the offset voltage is not eliminated from the root of a circuit, so that the phenomena of flickering, screen splitting and the like are easily caused when the picture is tested.
Therefore, how to eliminate the offset voltage of the operational amplifier from the circuit structure is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a gamma correction circuit, a correction method, a source electrode driving circuit and a display panel, which are used for solving the problem that the influence of offset voltage of an operational amplifier on gamma voltage cannot be eliminated from a circuit structure in the related art.
In a first aspect, an embodiment of the present invention provides a gamma correction circuit, including: a first operational amplifier and a second operational amplifier;
the first operational amplifier comprises a first input end, a second input end and a first output end, wherein the first input end is connected with the signal input end, and the second input end is connected with the first output end;
the second operational amplifier comprises a third input end, a fourth input end and a second output end, the third input end is connected with the second output end, the fourth input end is connected with the first output end, and the second output end is connected with a signal output end;
the offset voltage value of the first input end and the offset voltage value of the second input end are opposite numbers, the offset voltage value of the third input end and the offset voltage value of the fourth input end are opposite numbers, and the offset voltage value of the first input end and the offset voltage value of the fourth input end are opposite numbers.
In a possible implementation manner, in the gamma correction circuit provided in the embodiment of the present invention, the first operational amplifier and the second operational amplifier are the same operational amplifier, and the operational amplifier includes a fifth input terminal, a sixth input terminal, and a third output terminal;
further comprising: the storage capacitor comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a storage capacitor;
in a first stage, the first switch conducts the signal input end and the fifth input end, the second switch short-circuits the sixth input end and the third output end, and the third switch controls the third output end to charge the storage capacitor;
in a second stage, the fourth switch controls the storage capacitor to provide a voltage signal for the sixth input end, the fifth switch short-circuits the fifth input end and the third output end, and the sixth switch conducts the third output end and the signal output end;
wherein, in the first stage, the operational amplifier corresponds to the first operational amplifier, and in the second stage, the operational amplifier corresponds to the second operational amplifier.
In a possible implementation manner, in the gamma correction circuit provided in the embodiment of the present invention, the first switch is connected between the signal input terminal and a first node;
the second switch is connected between the sixth input end and a second node;
the third switch is connected between the second node and the fourth switch, the third switch and the fourth switch are both connected with the first electrode of the storage capacitor, and the second electrode of the storage capacitor is grounded;
the fourth switch is connected between the storage capacitor and the sixth input end;
the fifth switch is connected between the first node and the second node;
the sixth switch is connected between the second node and the signal output terminal.
In one possible implementation manner, in the gamma correction circuit provided by the embodiment of the invention, each of the plurality of switches is a switching transistor.
In a possible implementation manner, in the gamma correction circuit provided in the embodiment of the invention, each of the switching transistors is an N-type transistor, or each of the switching transistors is a P-type transistor.
In a possible implementation manner, in the gamma correction circuit provided in the embodiment of the present invention, control terminals of the first switch, the second switch, and the third switch are connected to the same signal line;
and the control ends of the fourth switch, the fifth switch and the sixth switch are connected with the same signal line.
In a second aspect, an embodiment of the present invention further provides a correction method for a gamma correction circuit, including:
providing a first voltage signal to a signal input;
the first operational amplifier provides a second voltage signal comprising the first voltage signal and the offset voltage of the first input end to a fourth input end of the second operational amplifier;
the second operational amplifier provides a signal including the second voltage signal and the offset voltage of the fourth input terminal to a signal output terminal.
In one possible implementation manner, in the correction method of the gamma correction circuit provided in the embodiment of the present invention, when the first operational amplifier and the second operational amplifier are the same operational amplifier, the method further includes:
in the first stage, a first voltage signal is provided for the signal input end, the first switch, the second switch and the third switch are controlled to be switched on, the fourth switch, the fifth switch and the sixth switch are controlled to be switched off, and a second voltage signal of a third output end of the operational amplifier is used for charging the storage capacitor;
in the second stage, the fourth switch, the fifth switch and the sixth switch are controlled to be switched on, the first switch, the second switch and the third switch are controlled to be switched off, the second voltage signal stored by the storage capacitor is provided to the sixth input end of the operational amplifier, and the operational amplifier is controlled to provide the signal of the third output end to the signal output end;
wherein, in the first stage, the operational amplifier corresponds to the first operational amplifier, and in the second stage, the operational amplifier corresponds to the second operational amplifier.
In a third aspect, an embodiment of the present invention further provides a source driving circuit, including a gamma circuit and the gamma correction circuit provided in the embodiment of the first aspect;
and the signal input ends of the gamma correction circuits are connected with the output ends of the gamma circuits in a one-to-one correspondence mode.
In a fourth aspect, an embodiment of the present invention further provides a display panel, including the source driving circuit provided in the fourth aspect.
The invention has the following beneficial effects:
the embodiment of the invention provides a gamma correction circuit, a correction method, a source electrode drive circuit and a display panel, wherein the gamma correction circuit comprises: a first operational amplifier and a second operational amplifier; the first operational amplifier comprises a first input end, a second input end and a first output end, wherein the first input end is connected with the signal input end, and the second input end is connected with the first output end; the second operational amplifier comprises a third input end, a fourth input end and a second output end, the third input end is connected with the second output end, the fourth input end is connected with the first output end, and the second output end is connected with a signal output end; the offset voltage value of the first input end and the offset voltage value of the second input end are opposite numbers, the offset voltage value of the third input end and the offset voltage value of the fourth input end are opposite numbers, and the offset voltage value of the first input end and the offset voltage value of the fourth input end are opposite numbers. Through the arrangement of the first operational amplifier and the second operational amplifier, the first output end is connected with the fourth input end, so that the influence of offset voltage of the operational amplifier on gamma voltage is eliminated in operation, the influence of the offset voltage on a circuit structure is eliminated, and the quality of a display picture is improved.
Drawings
FIG. 1 is a schematic diagram of a gamma correction circuit according to the related art;
FIG. 2 is a schematic diagram of a gamma correction circuit according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of a gamma correction circuit according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a driving method of a gamma correction circuit according to an embodiment of the present invention.
Detailed Description
In the related art, as shown in fig. 1, the Input voltage of the gamma correction circuit is V, the K switch in the circuit is closed, the K' switch in the circuit is open, the a1 terminal is used as the non-inverting Input terminal, and the voltage obtained by the Output voltage due to the offset is V + Δ V. When a K switch in the circuit is disconnected, a K' switch in the circuit is closed, the end A2 is used as a non-inverting input end, and the voltage obtained by the Output voltage due to offset is V-delta V. The driving method used at present is to switch the polarities of a1 and a2 once in a frame, and the method is to neutralize and eliminate the offset voltage in the picture brightness, but not eliminate the offset voltage from the circuit at all, and is easy to cause the bad phenomena of flicker, split screen and the like when testing the picture.
Specifically, for example, when a liquid crystal display panel adopts a column inversion driving mode to test a picture, if an offset voltage which is more positive is superimposed when a negative voltage is output from an a1 terminal, an absolute value of the output voltage is less, and the picture brightness is darker; when the end A2 outputs positive voltage, the absolute value of the output voltage is small and the brightness of the picture is dark if negative voltage is superposed; if the screen has two source electrode driving circuits, when the offset voltages of the two source electrode driving circuits are different, the screen division of the picture can be shown, and the brightness of one half area is different from that of the other half, thereby seriously affecting the display effect.
In view of the above problems of the gamma correction circuit in the related art, embodiments of the present invention provide a gamma correction circuit, a correction method, a source driving circuit and a display panel. In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
As shown in fig. 2, the gamma correction circuit provided in the embodiment of the present invention includes: a first operational amplifier 1 and a second operational amplifier 2;
the first operational amplifier 1 comprises a first Input end A, a second Input end B and a first output end, wherein the first Input end A is connected with the signal Input end, and the second Input end B is connected with the first output end;
the second operational amplifier 2 comprises a third input end C, a fourth input end D and a second Output end, wherein the third input end C is connected with the second Output end, the fourth input end D is connected with the first Output end, and the second Output end is connected with the signal Output end Output;
the offset voltage value of the first input end C and the offset voltage value of the second input end B are opposite numbers, the offset voltage value of the third input end C and the offset voltage value of the fourth input end D are opposite numbers, and the offset voltage value of the first input end a and the offset voltage value of the fourth input end D are opposite numbers.
Specifically, in the gamma correction circuit provided by the embodiment of the invention, as shown in fig. 2, the signal Input terminal provides the first voltage signal V to the first Input terminal a of the first operational amplifier 1, since the offset voltage of the first input terminal a of the first operational amplifier 1 is + Δ V, the second voltage signal output from the first output terminal a of the first operational amplifier 1 is V + Δ V, and the second voltage signal is provided to the fourth input terminal D of the second operational amplifier 2, since the offset voltage value of the fourth input terminal D and the offset voltage value of the first input terminal a are opposite numbers, the offset voltage at the fourth input terminal D is- Δ V, so that the voltage output by the fourth output terminal D of the second operational amplifier 2 is V +/Δ V- Δ V ═ V, thereby realizing that the offset voltage of the operational amplifier is eliminated through the circuit structure.
Specifically, in the gamma correction circuit provided in the embodiment of the present invention, the first output terminal is connected to the fourth input terminal through the arrangement of the first operational amplifier and the second operational amplifier, so that the influence of the offset voltage of the operational amplifier on the gamma voltage is eliminated in operation, the influence of the offset voltage on the circuit structure is eliminated, and the quality of the display image is improved.
Optionally, in the gamma correction circuit provided in the embodiment of the present invention, as shown in fig. 3, the first operational amplifier and the second operational amplifier are the same operational amplifier 3, and the operational amplifier 3 includes a fifth input end E, a sixth input end F and a third output end;
further comprising: a first switch T1, a second switch T2, a third switch T3, a fourth switch T4, a fifth switch T5, a sixth switch T6, and a storage capacitor Cs;
in the first stage, the first switch T1 turns on the signal Input terminal Input and the fifth Input terminal E, the second switch T2 short-circuits the sixth Input terminal F and the third output terminal, and the third switch T3 controls the third output terminal to charge the storage capacitor Cs;
in the second stage, the fourth switch T4 controls the storage capacitor Cs to provide a voltage signal to the sixth input terminal F, the fifth switch T5 short-circuits the fifth input terminal F with the third Output terminal, and the sixth switch T6 turns on the third Output terminal with the signal Output terminal Output;
wherein, in the first stage, the operational amplifier is equivalent to the first operational amplifier, and in the second stage, the operational amplifier is equivalent to the second operational amplifier.
Specifically, in the gamma correction circuit provided by the embodiment of the invention, as shown in fig. 3, in the first stage, the first switch T1, the second switch T2 and the third switch T3 are turned on, and the fourth switch T4, the fifth switch T5 and the sixth switch T6 are turned off; the signal Input end provides a first voltage signal V, the first switch T1 is turned on, the first voltage signal V is provided to the fifth Input end E of the operational amplifier 3, the second switch T2 is turned on to short-circuit the sixth Input end F of the operational amplifier 3 with the third output end, and since the offset voltage of the fifth Input end E of the operational amplifier 3 is +. DELTA.v, the second voltage signal V +. DELTA.v is output at the third output end of the operational amplifier 3 at the first stage, the third switch T3 is turned on, and the storage capacitor Cs is charged by using the second voltage signal until the storage voltage of the storage capacitor Cs is V +. DELTA.v;
in the second stage, the first switch T1, the second switch T2 and the third switch T3 are turned off, and the fourth switch T4, the fifth switch T5 and the sixth switch T6 are turned on; the fifth switch T5 is turned on to short-circuit the fifth input terminal E with the third Output terminal, the fourth switch T4 is turned on, the storage capacitor Cs provides the sixth input terminal F with the input voltage V +/Δ V, and since the offset voltage of the sixth input terminal F is Δ V, the Output voltage of the third Output terminal is V +/Δ V — Δ V at the second stage, and the sixth switch T6 is turned on to provide the Output voltage V of the third Output terminal to the signal Output terminal Output.
Optionally, in the gamma correction circuit provided in the embodiment of the invention, as shown in fig. 3, the first switch T1 is connected between the signal Input terminal Input and the first node N1;
the second switch T2 is connected between the sixth input terminal F and the second node N2;
the third switch T3 is connected between the second node N2 and the fourth switch T4, and both the third switch T3 and the fourth switch T4 are connected to the first electrode of the storage capacitor Cs, and the second electrode of the storage capacitor Cs is grounded;
the fourth switch T4 is connected between the storage capacitor Cs and the sixth input terminal F;
the fifth switch T5 is connected between the first node N1 and the second node N2;
the sixth switch T6 is connected between the second node N2 and the signal Output terminal Output.
Optionally, in the gamma correction circuit provided in the embodiment of the invention, each of the plurality of switches is a switching transistor.
Of course, each switch may be any other controllable switch besides the switching transistor, and is not limited in particular herein.
Optionally, in the gamma correction circuit provided in the embodiment of the present invention, each of the switching transistors is an N-type transistor, or each of the switching transistors is a P-type transistor.
Specifically, each switch transistor is an N-type transistor, or each switch transistor is a P-type transistor, and all the switch transistors can be formed through the same composition process, so that the preparation process is simplified.
Optionally, in the gamma correction circuit provided in the embodiment of the present invention, control terminals of the first switch, the second switch, and the third switch are connected to the same signal line;
and the control ends of the fourth switch, the fifth switch and the sixth switch are connected with the same signal line.
In particular, in the gamma correction circuit provided by the embodiment of the invention, the arrangement can reduce the number of signal lines and simplify the wiring of the circuit.
Based on the same inventive concept, as shown in fig. 4, an embodiment of the present invention further provides a correction method of a gamma correction circuit, including:
s401, providing a first voltage signal to a signal input end;
s402, the first operational amplifier provides a second voltage signal comprising the first voltage signal and offset voltage of the first input end to a fourth input end of the second operational amplifier;
s402, the second operational amplifier provides a signal comprising the second voltage signal and the offset voltage of the fourth input end to the signal output end.
Optionally, in the gamma correction circuit provided in the embodiment of the present invention, when the first operational amplifier and the second operational amplifier are the same operational amplifier, the method further includes:
in the first stage, a first voltage signal is provided for a signal input end, the first switch, the second switch and the third switch are controlled to be switched on, the fourth switch, the fifth switch and the sixth switch are controlled to be switched off, and a second voltage signal of a third output end of the operational amplifier is used for charging the storage capacitor;
in the second stage, the fourth switch, the fifth switch and the sixth switch are controlled to be switched on, the first switch, the second switch and the third switch are controlled to be switched off, the second voltage signal stored by the storage capacitor is provided to the sixth input end of the operational amplifier, and the operational amplifier is controlled to provide the signal of the third output end to the signal output end;
wherein, in the first stage, the operational amplifier is equivalent to the first operational amplifier, and in the second stage, the operational amplifier is equivalent to the second operational amplifier.
The specific implementation steps of the driving method have been described in detail in the embodiment of the gamma correction circuit, so that the driving method can be implemented with reference to the embodiment of the gamma correction circuit, and will not be described herein again.
Based on the same inventive concept, the embodiment of the present invention further provides a source driving circuit, which includes a gamma circuit and the gamma correction circuit provided in any of the above embodiments;
the signal input ends of the gamma correction circuits are connected with the output ends of the gamma circuits in a one-to-one correspondence mode.
Based on the same inventive concept, an embodiment of the present invention further provides a display panel, including the source driver circuit provided in the above embodiment.
Since the principle of the source driver circuit and the display panel for solving the problems is similar to that of the gamma correction circuit, the implementation of the source driver circuit and the display panel can be referred to the implementation of the gamma correction circuit, and repeated details are not repeated.
The embodiment of the invention provides a gamma correction circuit, a correction method, a source electrode drive circuit and a display panel, wherein the gamma correction circuit comprises: a first operational amplifier and a second operational amplifier; the first operational amplifier comprises a first input end, a second input end and a first output end, wherein the first input end is connected with the signal input end, and the second input end is connected with the first output end; the second operational amplifier comprises a third input end, a fourth input end and a second output end, the third input end is connected with the second output end, the fourth input end is connected with the first output end, and the second output end is connected with a signal output end; the offset voltage value of the first input end and the offset voltage value of the second input end are opposite numbers, the offset voltage value of the third input end and the offset voltage value of the fourth input end are opposite numbers, and the offset voltage value of the first input end and the offset voltage value of the fourth input end are opposite numbers. Through the arrangement of the first operational amplifier and the second operational amplifier, the first output end is connected with the fourth input end, so that the influence of offset voltage of the operational amplifier on gamma voltage is eliminated in operation, the influence of the offset voltage on a circuit structure is eliminated, and the quality of a display picture is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A gamma correction circuit, comprising: a first operational amplifier and a second operational amplifier;
the first operational amplifier comprises a first input end, a second input end and a first output end, wherein the first input end is connected with the signal input end, and the second input end is connected with the first output end;
the second operational amplifier comprises a third input end, a fourth input end and a second output end, the third input end is connected with the second output end, the fourth input end is connected with the first output end, and the second output end is connected with a signal output end;
the offset voltage value of the first input end and the offset voltage value of the second input end are opposite numbers, the offset voltage value of the third input end and the offset voltage value of the fourth input end are opposite numbers, and the offset voltage value of the first input end and the offset voltage value of the fourth input end are opposite numbers.
2. The gamma correction circuit of claim 1, wherein the first operational amplifier and the second operational amplifier are the same operational amplifier, the operational amplifier including a fifth input, a sixth input, and a third output;
further comprising: the storage capacitor comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a storage capacitor;
in a first stage, the first switch conducts the signal input end and the fifth input end, the second switch short-circuits the sixth input end and the third output end, and the third switch controls the third output end to charge the storage capacitor;
in a second stage, the fourth switch controls the storage capacitor to provide a voltage signal for the sixth input end, the fifth switch short-circuits the fifth input end and the third output end, and the sixth switch conducts the third output end and the signal output end;
wherein, in the first stage, the operational amplifier corresponds to the first operational amplifier, and in the second stage, the operational amplifier corresponds to the second operational amplifier.
3. The gamma correction circuit of claim 2, wherein the first switch is connected between the signal input terminal and a first node;
the second switch is connected between the sixth input end and a second node;
the third switch is connected between the second node and the fourth switch, the third switch and the fourth switch are both connected with the first electrode of the storage capacitor, and the second electrode of the storage capacitor is grounded;
the fourth switch is connected between the storage capacitor and the sixth input end;
the fifth switch is connected between the first node and the second node;
the sixth switch is connected between the second node and the signal output terminal.
4. The gamma correction circuit of claim 3, wherein each of the plurality of switches is a switching transistor.
5. The gamma correction circuit of claim 4, wherein each of the switching transistors is an N-type transistor or each of the switching transistors is a P-type transistor.
6. The gamma correction circuit of claim 5, wherein control terminals of the first switch, the second switch, and the third switch are connected to the same signal line;
and the control ends of the fourth switch, the fifth switch and the sixth switch are connected with the same signal line.
7. A correction method of the gamma correction circuit according to any one of claims 2 to 6, comprising:
providing a first voltage signal to a signal input;
the first operational amplifier provides a second voltage signal comprising the first voltage signal and the offset voltage of the first input end to a fourth input end of the second operational amplifier;
the second operational amplifier provides a signal including the second voltage signal and the offset voltage of the fourth input terminal to a signal output terminal.
8. The method of correcting of claim 7, wherein when the first operational amplifier and the second operational amplifier are the same operational amplifier, the method further comprises:
in the first stage, a first voltage signal is provided for the signal input end, the first switch, the second switch and the third switch are controlled to be switched on, the fourth switch, the fifth switch and the sixth switch are controlled to be switched off, and a second voltage signal of a third output end of the operational amplifier is used for charging the storage capacitor;
in the second stage, the fourth switch, the fifth switch and the sixth switch are controlled to be switched on, the first switch, the second switch and the third switch are controlled to be switched off, the second voltage signal stored by the storage capacitor is provided to the sixth input end of the operational amplifier, and the operational amplifier is controlled to provide the signal of the third output end to the signal output end;
wherein, in the first stage, the operational amplifier corresponds to the first operational amplifier, and in the second stage, the operational amplifier corresponds to the second operational amplifier.
9. A source driving circuit comprising a gamma circuit and the gamma correction circuit according to any one of claims 1 to 6;
and the signal input ends of the gamma correction circuits are connected with the output ends of the gamma circuits in a one-to-one correspondence mode.
10. A display panel comprising the source driver circuit according to claim 9.
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| CN113963664B (en) * | 2021-10-22 | 2022-12-09 | 晟合微电子(肇庆)有限公司 | Display method based on cascade drive chip, display and readable storage medium |
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| CN104485897A (en) * | 2014-12-09 | 2015-04-01 | 中国航空工业集团公司第六三一研究所 | Correlated double sampling switch capacity amplifier with offset compensation |
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| JPH02131004A (en) * | 1988-11-11 | 1990-05-18 | Hitachi Ltd | Offset voltage compensation circuit |
| JP2007086153A (en) * | 2005-09-20 | 2007-04-05 | Seiko Epson Corp | Driving circuit, electrooptical device, and electronic equipment |
| CN101986559A (en) * | 2009-07-29 | 2011-03-16 | 比亚迪股份有限公司 | Analog signal processing circuit |
| TW201241815A (en) * | 2011-04-01 | 2012-10-16 | Fitipower Integrated Tech Inc | Source driver of LCD panel |
| CN104238614A (en) * | 2014-09-03 | 2014-12-24 | 李倩 | Reference voltage circuit |
| CN104568169B (en) * | 2015-01-28 | 2017-12-26 | 江苏物联网研究发展中心 | The infrared focal plane read-out circuit of function is eliminated with imbalance |
| CN106208981A (en) * | 2016-07-15 | 2016-12-07 | 天津大学 | A kind of infrared image sensor input stage electric capacity trsanscondutance amplifier structure |
| CN106534729B (en) * | 2016-11-11 | 2019-06-11 | 中国电子科技集团公司第四十四研究所 | Programmable gain amplifier and reduction column fixed pattern noise method |
| CN107769733B (en) * | 2017-10-25 | 2020-10-23 | 天津大学 | Offset cancellation circuit of switched capacitor amplifier |
| CN109067367B (en) * | 2018-09-18 | 2024-04-05 | 上海新进芯微电子有限公司 | Hall signal amplifying circuit |
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| CN104485897A (en) * | 2014-12-09 | 2015-04-01 | 中国航空工业集团公司第六三一研究所 | Correlated double sampling switch capacity amplifier with offset compensation |
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