CN113517866A - Operational amplifier and feedback type amplitude limiting circuit of operational amplifier - Google Patents
Operational amplifier and feedback type amplitude limiting circuit of operational amplifier Download PDFInfo
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- CN113517866A CN113517866A CN202110770010.3A CN202110770010A CN113517866A CN 113517866 A CN113517866 A CN 113517866A CN 202110770010 A CN202110770010 A CN 202110770010A CN 113517866 A CN113517866 A CN 113517866A
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- 230000000670 limiting effect Effects 0.000 title claims abstract description 127
- 230000003321 amplification Effects 0.000 claims abstract description 28
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 28
- 230000000903 blocking effect Effects 0.000 claims description 11
- 230000005669 field effect Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 6
- 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
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000010363 phase shift Effects 0.000 description 1
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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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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 amplification 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 amplification module, the voltage comparison module is connected between the analog amplification module and the signal output end, and the voltage comparison module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting direct-current voltage for controlling the amplitude limiting module to limit 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 amplitude limiting of an input signal through an amplitude limiting module, and adjusts the amplitude of the input signal limitation of the amplitude limiting module by adopting direct current voltage input by a voltage comparison module, so that amplitude limiting of an input signal of more than 5V is realized; the problem that the amplitude limiting mode of the existing operational amplifier on the input signal cannot limit the amplitude of the input signal with the voltage of more than 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
Operational amplifiers (op-amps for short) are circuit units with very high amplification. In an actual circuit, a certain functional module is usually formed together with a feedback network. It is an amplifier with special coupling circuit and feedback. The output signal may 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 at a signal input port of an operational amplifier, so that the voltage amplitude of a signal is in a certain range, and the amplitude limiting mode has the defect that the signal amplitude limiting is invalid when the input signal reaches more than 5V; secondly, amplitude limiting is achieved by utilizing the conducting and stopping working voltage of a PN junction of the diode, when the signal amplitude reaches a working voltmeter of the diode, the diode is conducted to introduce a signal into a ground wire, and therefore the purpose of signal amplitude limiting is achieved, but the amplitude limiting mode has the defects that when the signal input voltage is overlarge, the current of the diode is overlarge, the diode is possibly burnt out, 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 high distortion degree and high noise; when the signal input voltage is too large (more than 5V), the phenomena of signal top elimination and jitter are caused, 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 amplitude limiting mode of the existing operational amplifier on an input signal cannot limit the amplitude of the input signal with the voltage of more than 5V.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a feedback type amplitude limiting circuit of an operational amplifier comprises a signal input end, an analog amplification module connected with the signal input end and a signal output end connected with the analog amplification 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 amplification module, the voltage comparison module is connected between the analog amplification module and the signal output end, and the voltage comparison module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting direct-current voltage for controlling the amplitude limiting module to limit 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 amplitude limiting module includes an amplitude limiting element, a first end of the amplitude limiting element is connected to the voltage comparing module, a second end of the amplitude limiting element is connected to the signal input terminal and the analog amplifying module, and a third end of the amplitude limiting element is grounded.
Preferably, the clipping element is a field effect transistor.
Preferably, the internal resistance of the clipping element is less than 1 Ω.
Preferably, the voltage comparison module includes a voltage comparison element, a first switching element and a rectification module, an input end of the voltage comparison element is connected with an output end of the analog amplification module, an output end of the voltage comparison element is connected with a first end of the first switching element, and a 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 switch 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 type amplitude limiting circuit of the operational amplifier comprises a dc blocking element for isolating dc from an output signal, and the dc blocking element is connected between the analog amplifying module and the signal output terminal.
Preferably, the feedback type amplitude limiting circuit of the operational amplifier comprises a display module respectively connected with the amplitude limiting module and the voltage comparing module, and the display module comprises a display element for displaying the work of the amplitude limiting module.
Preferably, the display element is connected to the amplitude limiting module and the voltage comparing module through a second switch element, a first end of the second switch element is connected to the amplitude limiting module and the voltage comparing module, a second end of the second switch element is connected to the display element, and a third end of the second switch element is grounded.
The invention also provides an operational amplifier which comprises the feedback type amplitude limiting circuit of the operational amplifier.
According to the technical scheme, the embodiment of the invention has the following advantages: the feedback type amplitude limiting circuit of the operational amplifier comprises a signal input end, an analog amplification 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 amplification module, the voltage comparison module is connected between the analog amplification module and the signal output end, and the voltage comparison module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting direct current voltage for controlling the amplitude limiting module to limit 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 amplitude limiting of an input signal through an amplitude limiting module, and adopts direct-current voltage input by a voltage comparison module to adjust the amplitude of the input signal limitation of the amplitude limiting module, so as to realize amplitude limiting processing of the input signal of more than 5V; the technical problem that the amplitude limiting mode of the existing operational amplifier on the input signal cannot limit the amplitude of the input signal with the voltage of more than 5V is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a block diagram of a feedback limiter circuit of an operational amplifier according to an embodiment of the invention.
Fig. 2 is a schematic circuit diagram of a feedback limiter 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 obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and 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 embodiment of the application provides an operational amplifier and a feedback type amplitude limiting circuit of the operational amplifier, and is used for solving the technical problem that the amplitude limiting mode of the existing operational amplifier on an input signal cannot limit the amplitude of the input signal with the voltage of more than 5V.
The first embodiment is as follows:
fig. 1 is a block diagram of a feedback limiter circuit of an operational amplifier according to an embodiment of the present invention, and fig. 2 is a schematic circuit diagram of the feedback limiter circuit of the operational amplifier according to the embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a feedback type amplitude limiting circuit of an operational amplifier, including a signal input terminal 10, an analog amplification module 20 connected to the signal input terminal 10, a signal output terminal 30 connected to the analog amplification module 20, an amplitude limiting module 40, and a voltage comparison module 50; the amplitude limiting module 40 is connected between the signal input end 10 and the analog amplification module 20, the voltage comparison module 50 is connected between the analog amplification module 20 and the signal output end 30, and the voltage comparison module 50 is also connected with the amplitude limiting module 40; the voltage comparison module 50 is configured to output a dc voltage for controlling the amplitude limiting module 40 to limit the amplitude of the input signal, and the amplitude limiting module 40 is configured to perform 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 for the connection terminal of the signal input, and the signal output terminal 30 is mainly used for the connection terminal of the signal output.
In the embodiment of the present invention, the analog amplification module 20 is mainly used for amplifying the signal input from the signal input terminal 10.
It should be noted that, as shown in fig. 2, the analog amplification module 20 includes a signal amplifier U1A, a second terminal 2 of the signal amplifier U1A is connected to the signal input terminal 10 and the amplitude limiting module 40, a third terminal 3 of the signal amplifier U1A is grounded, a first terminal 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 terminal 2 of the signal amplifier U1A and the first terminal 1 of the signal amplifier U1A. In this embodiment, since signals with different frequencies will generate phase shifts and attenuations with different degrees through the capacitors, the feedback limiter circuit of the operational amplifier adds the first capacitor C1 to the feedback end of the analog amplification module 20 to perform phase compensation and prevent oscillation, thereby achieving 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 peak value of the signal output from the first end 1 of the signal amplifier U1A 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 perform amplitude limiting on the voltage amplitude of the input signal.
In the embodiment of the present invention, the amplitude limiting module 40 is mainly used for limiting the amplitude of the signal voltage input to the analog amplifying module 20.
The invention provides a feedback type amplitude limiting circuit of an operational amplifier, which comprises a signal input end, an analog amplification module, a signal output end, an amplitude limiting module and a voltage comparison module, wherein the signal input end is connected with the analog amplification module; the amplitude limiting module is connected between the signal input end and the analog amplification module, the voltage comparison module is connected between the analog amplification module and the signal output end, and the voltage comparison module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting direct current voltage for controlling the amplitude limiting module to limit 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 amplitude limiting of an input signal through an amplitude limiting module, and adopts direct-current voltage input by a voltage comparison module to adjust the amplitude of the input signal limitation of the amplitude limiting module, so as to realize amplitude limiting processing of the input signal of more than 5V; the technical problem that the amplitude limiting mode of the existing operational amplifier on the input signal cannot limit the amplitude of the input signal with the voltage of more than 5V is solved.
As shown in fig. 2, in an 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, and a third terminal of the clipping element Q1 is grounded.
The limiter element Q1 may be a MOS field effect transistor. In the present embodiment, the internal resistance of the amplitude limiting element Q1 is smaller than 1 Ω, so that the amplitude limiting module 40 can limit the input signal with 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 less than 1 omega, so that the amplitude limiting effect can be realized on small-signal amplitude input signals lower than 5V, the amplitude limiting effect can be realized on large-signal amplitude input signals higher than 5V, and the amplitude limiting range of the operational amplifier is improved.
As shown in fig. 2, in an 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, an input terminal of the voltage comparing element U1B is connected to an output terminal of the analog amplifying module 20, an output terminal of the voltage comparing element U1B is connected to a first terminal of the first switching element Q2, and a third terminal of the first switching element Q2 is connected to the clipping module 40 and the rectifying module 51, respectively; the voltage comparing element U1B is configured to output a square wave signal corresponding to the input signal, a voltage in the square wave signal is transmitted to the rectifying module 51 through the first switching element Q2, and the rectifying module 51 performs rectification and 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.
Note that the input terminal pin 5 of the voltage comparator U1B is connected to the first terminal 1 of the signal amplifier U1A, the input terminal pin 6 of the voltage comparator U1B is connected to the comparison voltage adjustable element RZ1, and the output terminal pin 7 of the voltage comparator U1B is connected to the first terminal 1 of the first switching element Q2. The rectifying module 51 comprises three one hundred eighty-seven resistors R187, a one hundred eighteenth capacitor C118 and a thirty-third diode D33 which are connected in parallel, one end of three parallel nodes of the one hundred eighty-seven resistors R187, the one hundred eighteenth capacitor C118 and the thirty-third diode D33 is connected with the third terminal 3 of the first switching element Q2 and the first terminal 1 of the amplitude limiting element Q1, and the other end of the parallel node is 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 having a switching function.
In the embodiment of the present 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 of the voltage comparing element U1B to compare with the pin 6, and outputs a square wave signal corresponding to the square wave pulse width of the input signal from the output terminal pin 7 of the voltage comparing 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 direct current voltage is used to control the amplitude of the amplitude limiting element Q1 to limit the amplitude of the input signal, the amplitude limiting element Q1 can be understood as a variable resistor, the voltage on the diode D33 controls the resistance value of the amplitude limiting element Q1, and the input signal is led to the ground line, thereby achieving the purpose of signal amplitude limiting. Since the limiting element Q1 is a fet, the input signal can be limited by turning on the fet by the voltage on the diode D33. The limiter 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 of the diode D33 is connected to the gate through the resistor R6, the larger the voltage is, the larger the current flows through the drain, the signal can be led to the ground because the drain is connected to a limited signal, and it can be understood that the larger the gate voltage is, the smaller the internal resistance of the limiter element Q1 is, the larger the input signal voltage flows to the ground, and the limiting effect is achieved.
In one embodiment of the present invention, as shown in fig. 2, 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 is preferably a polar capacitor, 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 to convert the amplitude-limited signal output from the signal output terminal 30 into an ac signal.
As shown in fig. 1 and 2, in an embodiment of the present invention, the feedback type 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 comparison module 50 through the second switch element Q3, the first terminal 1 of the second switch element Q3 is connected to the clipping module 40 and the voltage comparison module 60, the second terminal 2 of the second switch element Q3 is connected to the display element LED1, and the third terminal of the second switch element Q3 is grounded.
The display element LED1 may be an LED lamp, and the second switching element Q3 may be a transistor 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, in the second embodiment, the content of the feedback type amplitude limiting circuit of the operational amplifier is already described in detail in the first embodiment, so that the content of the feedback type amplitude limiting circuit of the operational amplifier is not described in the second embodiment one by one again.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A feedback type amplitude limiting circuit of an operational amplifier comprises a signal input end, an analog amplification module connected with the signal input end and a signal output end connected with the analog amplification module, and is characterized in that 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 amplification module, the voltage comparison module is connected between the analog amplification module and the signal output end, and the voltage comparison module is also connected with the amplitude limiting module; the voltage comparison module is used for outputting direct-current voltage for controlling the amplitude limiting module to limit 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.
2. The feedback type amplitude limiting circuit of the operational amplifier according to claim 1, wherein the amplitude limiting module comprises an amplitude limiting element, a first end of the amplitude limiting element is connected to the voltage comparing module, a second end of the amplitude limiting element is connected to the signal input terminal and the analog amplifying module, respectively, and a third end of the amplitude limiting element is grounded.
3. The operational amplifier feedback limiter circuit of claim 2, wherein the limiter element is a field effect transistor.
4. The operational amplifier feedback limiter circuit as claimed in claim 2, wherein the internal resistance of the limiter element is less than 1 Ω.
5. The feedback type amplitude limiting circuit of the operational amplifier according to claim 1, wherein the voltage comparing module comprises a voltage comparing element, a first switching element and a rectifying module, an input terminal of the voltage comparing element is connected to an output terminal of the analog amplifying module, an output terminal of the voltage comparing element is connected to a first terminal of the first switching element, and a third terminal of the first switching element is respectively connected to 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 switch 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.
6. The feedback limiter circuit of claim 4, wherein the voltage comparison module comprises a comparison voltage adjustable element connected to the voltage comparison element, and the comparison voltage adjustable element is configured to adjust a voltage of the square wave signal output by the voltage comparison module.
7. The operational amplifier feedback limiter circuit as claimed in claim 1, comprising a dc blocking element for blocking dc current from an output signal, wherein the dc blocking element is connected between the analog amplification block and the signal output terminal.
8. The feedback type amplitude limiting circuit of an operational amplifier according to claim 1, comprising a display module connected to the amplitude limiting module and the voltage comparing module, respectively, wherein the display module comprises a display element for displaying the operation of the amplitude limiting module.
9. The feedback limiter circuit of claim 8, wherein the display element is connected to the limiter module and the voltage comparator module through a second switch element, a first end of the second switch element is connected to the limiter module and the voltage comparator module, a second end of the second switch element is connected to the display element, and a third end of the second switch element is grounded.
10. An operational amplifier comprising the feedback limiter circuit of the operational amplifier of any one of claims 1-9.
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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 CN113517866B (en) | 2024-02-13 |
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| US5210503A (en) * | 1991-01-23 | 1993-05-11 | Rohm Co., Ltd. | Amplitude limiting amplifier circuit |
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| 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 |
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| 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 |
-
2021
- 2021-07-07 CN CN202110770010.3A patent/CN113517866B/en active Active
Patent Citations (8)
| 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 |
| US20070153937A1 (en) * | 2003-10-23 | 2007-07-05 | Grigory Itkin | Power control circuitary for a mobile terminal application |
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| 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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