CN113517866B - Operational amplifier and feedback type amplitude limiting circuit thereof - Google Patents
Operational amplifier and feedback type amplitude limiting circuit thereof Download PDFInfo
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- CN113517866B CN113517866B CN202110770010.3A CN202110770010A CN113517866B CN 113517866 B CN113517866 B CN 113517866B CN 202110770010 A CN202110770010 A CN 202110770010A CN 113517866 B CN113517866 B CN 113517866B
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- 230000000670 limiting effect Effects 0.000 title claims abstract description 118
- 230000000903 blocking effect Effects 0.000 claims description 10
- 230000005669 field effect Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
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- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
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Abstract
The invention relates to an operational amplifier and a feedback type amplitude limiting circuit of the operational amplifier, wherein the feedback type amplitude limiting circuit comprises a signal input end, an analog amplifying module, a signal output end, an amplitude limiting module and a voltage comparison module; the amplitude limiting module is connected between the signal input end and the analog amplifying module, the voltage comparing module is connected between the analog amplifying module and the signal output end, and the voltage comparing module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting and controlling the amplitude limiting module to limit the direct current voltage of the amplitude of the input signal, and the amplitude limiting module is used for carrying out amplitude limiting processing on the signal input from the signal input end. The feedback type amplitude limiting circuit realizes the amplitude limiting of the input signal through an amplitude limiting module, and adopts a direct current voltage input by a voltage comparison module to adjust the amplitude limiting module to limit the amplitude of the input signal so as to realize the amplitude limiting of the input signal with the voltage of more than 5V; the problem that the existing limiting mode of the operational amplifier to the input signals can not limit the input signals above 5V is solved.
Description
Technical Field
The invention relates to the technical field of operational amplifiers, in particular to an operational amplifier and a feedback type amplitude limiting circuit of the operational amplifier.
Background
An operational amplifier (simply referred to as an "operational amplifier") is a circuit unit having a very high amplification factor. In a practical circuit, some functional module is usually formed together with a feedback network. It is an amplifier with special coupling circuit and feedback. The output signal can be the result of mathematical operations such as addition, subtraction or differentiation, integration, etc. of the input signal.
The existing operational amplifier mainly adopts the following modes for carrying out amplitude limiting processing on signal input: firstly, a voltage amplitude limiting circuit is added to a signal input port of an operational amplifier to enable the voltage amplitude of a signal to be within a certain range, and the amplitude limiting mode has the defect that when the input signal reaches more than 5V, the signal amplitude limiting is invalid; secondly, limiting amplitude by utilizing the on-off working voltage of the PN junction of the diode, when the signal amplitude reaches the working voltmeter of the diode, the diode is conducted to introduce the signal into the ground wire so as to achieve the purpose of limiting amplitude of the signal, but the limiting mode has the defects that when the signal input voltage is overlarge, the diode is possibly burnt out due to overlarge current of the diode, and the parameter consistency of the diode is difficult to achieve due to the production process problem of the diode; thirdly, a special signal voltage amplitude limiting IC is adopted, and the amplitude limiting mode has the defects of large distortion degree and large noise; when the signal input voltage is too large (more than 5V), the signal is subjected to the phenomenon of signal toppling and jitter, so that the amplitude limiting is invalid.
Disclosure of Invention
The embodiment of the invention provides an operational amplifier and a feedback type amplitude limiting circuit of the operational amplifier, which are used for solving the technical problem that the existing amplitude limiting mode of the operational amplifier on input signals can not limit the input signals with the amplitude of more than 5V.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the feedback type amplitude limiting circuit of the operational amplifier comprises a signal input end, an analog amplifying module connected with the signal input end and a signal output end connected with the analog amplifying module, wherein the feedback type amplitude limiting circuit of the operational amplifier comprises an amplitude limiting module and a voltage comparison module; the amplitude limiting module is connected between the signal input end and the analog amplifying module, the voltage comparing module is connected between the analog amplifying module and the signal output end, and the voltage comparing module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting and controlling the amplitude limiting module to limit the direct current voltage of the amplitude of the input signal, and the amplitude limiting module is used for carrying out amplitude limiting processing on the input signal from the signal input end.
Preferably, the clipping module includes a clipping element, a first end of the clipping element is connected to the voltage comparing module, a second end of the clipping element is connected to the signal input end and the analog amplifying module, and a third end of the clipping element is grounded.
Preferably, the clipping element is a field effect transistor.
Preferably, the internal resistance of the clipping element is less than 1Ω.
Preferably, the voltage comparison module comprises a voltage comparison element, a first switching element and a rectification module, wherein the input end of the voltage comparison element is connected with the output end of the analog amplification module, the output end of the voltage comparison element is connected with the first end of the first switching element, and the third end of the first switching element is respectively connected with the amplitude limiting module and the rectification module; the voltage comparison element is used for outputting a square wave signal corresponding to the input signal, the voltage in the square wave signal is transmitted to the rectification module through the first switching element, and the rectification module carries out rectification filtering processing on the voltage in the square wave signal to obtain direct-current voltage in direct proportion to the input signal.
Preferably, the voltage comparison module comprises a comparison voltage adjustable element connected with the voltage comparison element, and the comparison voltage adjustable element is used for adjusting the voltage of the square wave signal output by the voltage comparison module.
Preferably, the feedback clipping circuit of the operational amplifier comprises a dc blocking element for isolating a direct current from the output signal, said dc blocking element being connected between said analog amplifying module and said signal output.
Preferably, the feedback type limiting circuit of the operational amplifier comprises a display module respectively connected with the limiting module and the voltage comparison module, and the display module comprises a display element for displaying the operation of the limiting module.
Preferably, the display element is connected to the clipping module and the voltage comparing module through a second switching element, a first end of the second switching element is connected to the clipping module and the voltage comparing module, a second end of the second switching element is connected to the display element, and a third end of the second switching element is grounded.
The invention also provides an operational amplifier, which comprises the feedback type amplitude limiting circuit of the operational amplifier.
From the above technical solutions, the embodiment of the present invention has the following advantages: the feedback type amplitude limiting circuit of the operational amplifier comprises a signal input end, an analog amplifying module, a signal output end, an amplitude limiting module and a voltage comparison module; the amplitude limiting module is connected between the signal input end and the analog amplifying module, the voltage comparing module is connected between the analog amplifying module and the signal output end, and the voltage comparing module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting and controlling the amplitude limiting module to limit the direct current voltage of the amplitude of the input signal, and the amplitude limiting module is used for carrying out amplitude limiting processing on the voltage amplitude of the input signal from the signal input end. The feedback type amplitude limiting circuit of the operational amplifier realizes the amplitude limiting of the input signal through the amplitude limiting module, and the direct current voltage input by the voltage comparison module is used for adjusting the amplitude limiting module to limit the amplitude of the input signal so as to realize the amplitude limiting processing of the input signal with the voltage of more than 5V; the technical problem that the existing limiting mode of the operational amplifier to the input signal can not limit the input signal with the voltage of more than 5V is solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a block diagram of a feedback clipping circuit of an operational amplifier according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a feedback clipping circuit of an operational amplifier according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the application provides an operational amplifier and a feedback type amplitude limiting circuit of the operational amplifier, which are used for solving the technical problem that the existing amplitude limiting mode of the operational amplifier on input signals can not limit the input signals above 5V.
Embodiment one:
fig. 1 is a block diagram of a feedback clipping circuit of an operational amplifier according to an embodiment of the present invention, and fig. 2 is a schematic circuit diagram of a feedback clipping circuit of an operational amplifier according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a feedback type limiting circuit of an operational amplifier, which includes a signal input terminal 10, an analog amplifying module 20 connected to the signal input terminal 10, a signal output terminal 30 connected to the analog amplifying module 20, a limiting module 40, and a voltage comparing module 50; the amplitude limiting module 40 is connected between the signal input end 10 and the analog amplifying module 20, the voltage comparing module 50 is connected between the analog amplifying module 20 and the signal output end 30, and the voltage comparing module 50 is also connected with the amplitude limiting module 40; the voltage comparison module 50 is used for outputting and controlling the amplitude limiting module 40 to limit the direct current voltage of the amplitude of the input signal, and the amplitude limiting module 40 is used for carrying out amplitude limiting processing on the input signal from the signal input end.
In the embodiment of the present invention, the signal input terminal 10 is mainly used as a signal input connection terminal, and the signal output terminal 30 is mainly used as a signal output connection terminal.
In the embodiment of the present invention, the analog amplifying module 20 is mainly used for amplifying the signal input from the signal input terminal 10.
As shown in fig. 2, the analog amplifying module 20 includes a signal amplifier U1A, a second end 2 of the signal amplifier U1A is connected to the signal input terminal 10 and the limiting module 40, a third end 3 of the signal amplifier U1A is grounded, a first end 1 of the signal amplifier U1A is connected to the signal output terminal 30 and the voltage comparing module 50, and a first capacitor C1 for coupling an input signal is further connected in parallel between the second end 2 of the signal amplifier U1A and the first end 1 of the signal amplifier U1A. In this embodiment, since signals with different frequencies are subjected to different degrees of phase shift and attenuation through the capacitors, the feedback limiting circuit of the operational amplifier performs phase compensation and prevents oscillation by adding the first capacitor C1 to the feedback end of the analog amplifying module 20, so as to achieve the purpose of suppressing high-frequency noise.
In the embodiment of the present invention, the voltage comparing module 50 performs comparison and rectification processing according to the signal peak value output by the first end 1 of the signal amplifier U1A, so as to obtain a direct current voltage proportional to the input signal, where the direct current voltage is used to control the amplitude limiting module 40 to limit the voltage amplitude of the input signal.
In the embodiment of the present invention, the clipping module 40 is mainly used for clipping the amplitude of the signal voltage input to the analog amplifying module 20.
The feedback type amplitude limiting circuit of the operational amplifier comprises a signal input end, an analog amplifying module, a signal output end, an amplitude limiting module and a voltage comparison module; the amplitude limiting module is connected between the signal input end and the analog amplifying module, the voltage comparing module is connected between the analog amplifying module and the signal output end, and the voltage comparing module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting and controlling the amplitude limiting module to limit the direct current voltage of the amplitude of the input signal, and the amplitude limiting module is used for carrying out amplitude limiting processing on the voltage amplitude of the input signal from the signal input end. The feedback type amplitude limiting circuit of the operational amplifier realizes the amplitude limiting of the input signal through the amplitude limiting module, and the direct current voltage input by the voltage comparison module is used for adjusting the amplitude limiting module to limit the amplitude of the input signal so as to realize the amplitude limiting processing of the input signal with the voltage of more than 5V; the technical problem that the existing limiting mode of the operational amplifier to the input signal can not limit the input signal with the voltage of more than 5V is solved.
As shown in fig. 2, in one embodiment of the present invention, the clipping module 40 includes a clipping element Q1, a first terminal of the clipping element Q1 is connected to the voltage comparing module 50, a second terminal of the clipping element Q1 is connected to the signal input terminal 10 and the analog amplifying module 20, respectively, and a third terminal of the clipping element Q1 is grounded.
Note that the limiter element Q1 may be a MOS field effect transistor. In the present embodiment, the internal resistance of the clipping element Q1 is less than 1Ω, so that the clipping module 40 can clip an input signal having an amplitude of 5V or more. The feedback type amplitude limiting circuit of the operational amplifier adopts the amplitude limiting element Q1 with the internal resistance smaller than 1 omega, so that the amplitude limiting effect can be realized on the input signal with the small signal amplitude lower than 5V, the amplitude limiting effect can be realized on the input signal with the large signal amplitude higher than 5V, and the amplitude limiting range of the operational amplifier is improved.
As shown in fig. 2, in one embodiment of the present invention, the voltage comparing module 50 includes a voltage comparing element U1B, a first switching element Q2, and a rectifying module 51, wherein an input end of the voltage comparing element U1B is connected to an output end of the analog amplifying module 20, an output end of the voltage comparing element U1B is connected to a first end of the first switching element Q2, and a third end of the first switching element Q2 is connected to the limiting module 40 and the rectifying module 51, respectively; the voltage comparison element U1B is configured to output a square wave signal corresponding to the input signal, the voltage in the square wave signal is transmitted to the rectification module 51 through the first switching element Q2, and the rectification module 51 performs rectification filtering processing on the voltage in the square wave signal to obtain a direct current voltage proportional to the input signal.
In the embodiment of the present invention, the voltage comparing module 50 includes a comparison voltage adjustable element RZ1 connected to the voltage comparing element U1B, and the comparison voltage adjustable element RZ1 is used for adjusting the voltage of the square wave signal output by the voltage comparing module 50.
The input terminal pin 5 of the voltage comparing element U1B is connected to the first terminal 1 of the signal amplifier U1A, the input terminal pin 6 of the voltage comparing element U1B is connected to the comparison voltage adjustable element RZ1, and the output terminal pin 7 of the voltage comparing element U1B is connected to the first terminal 1 of the first switching element Q2. The rectifying module 51 includes three parallel-connected first hundred eighty-seven resistors R187, a first hundred eighty-eight capacitor C118 and a thirty-third diode D33, wherein one ends of three parallel-connected nodes of the first hundred eighty-seven resistors R187, the first hundred eighty-eight capacitor C118 and the thirty-third diode D33 are connected with the third end 3 of the first switching element Q2 and the first end 1 of the limiting element Q1, and the other ends of the parallel-connected nodes are grounded. In this embodiment, the comparison voltage adjustable element RZ1 may be an adjustable resistor, and the first switching element Q2 may be a field effect transistor with a switching function.
In the embodiment of the invention, the feedback type amplitude limiting circuit of the operational amplifier transmits the signal amplified by the signal amplifier U1A to the input terminal pin 5 and the pin 6 of the voltage comparison element U1B for comparison, a square wave signal corresponding to the square wave pulse width of the input signal is output from the output terminal pin 7 of the voltage comparison element U1B, the larger the amplitude of the input signal is, the larger the square wave pulse width of the output square wave signal is, then the voltage of the square wave signal is processed by the first switching element Q2 and the rectifying module 51 to obtain a direct current voltage proportional to the input signal, the amplitude limiting element Q1 is controlled by adopting the direct current voltage to limit the amplitude of the input signal, the amplitude limiting element Q1 can be understood as a variable resistor, and the voltage on the diode D33 is used for controlling the resistance value of the amplitude limiting element Q1, so that the input signal is led to the ground wire, and the purpose of signal amplitude limiting is achieved. Since the limiting element Q1 is a fet, the limitation of the input signal can be achieved by turning on the fet with the voltage on the diode D33. The limiting element Q1 is a MOS field effect transistor, the MOS field effect transistor is a voltage controlled current device, the drain current is controlled by the gate voltage, when the voltage on the diode D33 is connected to the gate through the resistor R6, the larger the voltage is, the larger the current flowing through the drain, the signal can be led to the ground line because the limited signal is connected to the drain, at this time, the larger the gate voltage is, the smaller the internal resistance of the limiting element Q1 is, and the larger the voltage of the input signal flows to the ground line, so as to achieve the effect of limiting.
As shown in fig. 2, in one embodiment of the present invention, the feedback clipping circuit of the operational amplifier includes a dc blocking element C5 for isolating dc from the output signal, and the dc blocking element C5 is connected between the analog amplifying module 20 and the signal output terminal 30.
The dc blocking element C5 preferably has a polar capacitance, the positive electrode of the dc blocking element C5 is connected to the first terminal 1 of the signal amplifier U1A, and the negative electrode of the dc blocking element C5 is connected to the signal output terminal 30. In the present embodiment, the dc blocking element C5 is mainly used for converting the limited signal output from the signal output terminal 30 into an ac signal.
As shown in fig. 1 and 2, in one embodiment of the present invention, the feedback clipping circuit of the operational amplifier includes a display module 60 connected to the clipping module 40 and the voltage comparison module 50, respectively, and the display module 60 includes a display element LED1 for displaying the operation of the clipping module 40. The display element LED1 is connected to the clipping module 40 and the voltage comparing module 50 through a second switching element Q3, a first end 1 of the second switching element Q3 is connected to the clipping module 40 and the voltage comparing module 60, a second end 2 of the second switching element Q3 is connected to the display element LED1, and a third end of the second switching element Q3 is grounded.
The display element LED1 may be an LED lamp, and the second switching element Q3 may be a triode or a field effect transistor.
Example two
The embodiment of the invention provides an operational amplifier, which comprises the feedback type amplitude limiting circuit of the operational amplifier.
It should be noted that, the content of the feedback clipping circuit of the operational amplifier in the second embodiment has been described in detail in the first embodiment, and thus the content of the feedback clipping circuit of the operational amplifier in the second embodiment is not described again one by one.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The feedback type amplitude limiting circuit of the operational amplifier comprises a signal input end, an analog amplifying module connected with the signal input end and a signal output end connected with the analog amplifying module, and is characterized by comprising an amplitude limiting module and a voltage comparison module; the amplitude limiting module is connected between the signal input end and the analog amplifying module, the voltage comparing module is connected between the analog amplifying module and the signal output end, and the voltage comparing module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting and controlling the amplitude limiting module to limit the direct-current voltage of the amplitude of the input signal, and the amplitude limiting module is used for carrying out amplitude limiting processing on the input signal from the signal input end;
the amplitude limiting module comprises an amplitude limiting element, a first end of the amplitude limiting element is connected with the voltage comparison module, a second end of the amplitude limiting element is respectively connected with the signal input end and the analog amplifying module, and a third end of the amplitude limiting element is grounded; the internal resistance of the amplitude limiting element is less than 1 omega;
the voltage comparison module comprises a voltage comparison element, a first switching element and a rectifying module, wherein the input end of the voltage comparison element is connected with the output end of the analog amplifying module, the output end of the voltage comparison element is connected with the first end of the first switching element, and the third end of the first switching element is respectively connected with the amplitude limiting module and the rectifying module; the voltage comparison element is used for outputting a square wave signal corresponding to the input signal, the voltage in the square wave signal is transmitted to the rectification module through the first switching element, and the rectification module carries out rectification filtering processing on the voltage in the square wave signal to obtain direct-current voltage in direct proportion to the input signal; the rectifying module comprises a thirty-third diode, an anode of the thirty-third diode is grounded, and a cathode of the thirty-third diode is connected with the first end of the limiting element.
2. The feedback clipping circuit of an operational amplifier of claim 1 wherein the clipping element is a field effect transistor.
3. The feedback limiting circuit of claim 1, wherein the voltage comparison module comprises a comparison voltage adjustable element coupled to the voltage comparison element, the comparison voltage adjustable element configured to adjust the voltage of the square wave signal output by the voltage comparison module.
4. The feedback limiting circuit of claim 1, comprising a dc blocking element for isolating dc from an output signal, the dc blocking element being connected between the analog amplification block and the signal output.
5. The feedback limiting circuit of claim 1, comprising a display module coupled to the limiting module and the voltage comparison module, respectively, the display module comprising a display element for displaying operation of the limiting module.
6. The feedback clipping circuit of operational amplifier of claim 5 wherein the display element is connected to the clipping module and the voltage comparison module respectively by a second switching element, a first end of the second switching element is connected to the clipping module and the voltage comparison module respectively, a second end of the second switching element is connected to the display element, and a third end of the second switching element is grounded.
7. An operational amplifier comprising a feedback clipping circuit of an operational amplifier according to any one of claims 1-6.
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| CN202110770010.3A CN113517866B (en) | 2021-07-07 | 2021-07-07 | Operational amplifier and feedback type amplitude limiting circuit thereof |
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| CN202110770010.3A CN113517866B (en) | 2021-07-07 | 2021-07-07 | Operational amplifier and feedback type amplitude limiting circuit thereof |
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| CN113517866B true CN113517866B (en) | 2024-02-13 |
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| CN117055441B (en) * | 2023-09-21 | 2024-07-19 | 江苏神州半导体科技有限公司 | Voltage amplitude limiting circuit used in FPGA control system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5210503A (en) * | 1991-01-23 | 1993-05-11 | Rohm Co., Ltd. | Amplitude limiting amplifier circuit |
| JPH09321562A (en) * | 1996-05-31 | 1997-12-12 | Matsushita Electric Ind Co Ltd | Limiter device |
| JPH1065473A (en) * | 1996-08-22 | 1998-03-06 | Fujitsu Ltd | Amplifier circuit |
| CN1505262A (en) * | 2002-12-04 | 2004-06-16 | 华为技术有限公司 | A threshold value voltage adjustment method in limiting amplifier |
| CN101102160A (en) * | 2007-06-13 | 2008-01-09 | 华为技术有限公司 | Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver |
| JP2015106784A (en) * | 2013-11-29 | 2015-06-08 | 住友電気工業株式会社 | Optical communication module, optical communication device and optical communication method |
| CN112260667A (en) * | 2020-11-09 | 2021-01-22 | 苏州坤元微电子有限公司 | Single-amplitude limiting circuit and double-amplitude limiting circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60305505T2 (en) * | 2003-10-23 | 2007-04-26 | Sony Ericsson Mobile Communications Ab | Power control circuitry for a mobile terminal application |
-
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5210503A (en) * | 1991-01-23 | 1993-05-11 | Rohm Co., Ltd. | Amplitude limiting amplifier circuit |
| JPH09321562A (en) * | 1996-05-31 | 1997-12-12 | Matsushita Electric Ind Co Ltd | Limiter device |
| JPH1065473A (en) * | 1996-08-22 | 1998-03-06 | Fujitsu Ltd | Amplifier circuit |
| CN1505262A (en) * | 2002-12-04 | 2004-06-16 | 华为技术有限公司 | A threshold value voltage adjustment method in limiting amplifier |
| CN101102160A (en) * | 2007-06-13 | 2008-01-09 | 华为技术有限公司 | Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver |
| JP2015106784A (en) * | 2013-11-29 | 2015-06-08 | 住友電気工業株式会社 | Optical communication module, optical communication device and optical communication method |
| CN112260667A (en) * | 2020-11-09 | 2021-01-22 | 苏州坤元微电子有限公司 | Single-amplitude limiting circuit and double-amplitude limiting circuit |
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