Negative feedback amplifier
A negative feedback, amplifier technology, applied in the field of circuits, can solve the problem that the linearity of the output third-order intermodulation power is not ideal, and achieve the effects of high output third-order intermodulation power, reducing power loss, and low noise figure
Active Publication Date: 2021-03-26
THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP
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Problems solved by technology
[0004]
In view of this, the embodiment of the present invention provides a negative feedback amplifier to solve the problem that the noise figure index and the linearity of the output third-order intermodulation power of the traditional resistance parallel negative feedback amplifier are not ideal.
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[0029] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
[0030] figure 2 It is an example diagram of a negative feedback amplifier provided by an embodiment of the present invention. The negative feedback amplifier 10 includes a negative feedback circuit 11 and an amplifying circuit 12;
[0031] The negative feedback circuit 11 includes an input branch 1101 and an output branch 1102. The input branch 1101 receives the input signal and t...
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The invention belongs to the field of circuits, and particularly relates to a negative feedback type amplifier. The negative feedback type amplifier comprises a negative feedback circuit and an amplifying circuit, wherein the negative feedback circuit comprises an input branch and an output branch; the input branch receives an input signal and transmits the input signal to the input end of the amplifying circuit; the output branch receives and outputs the output signal of the amplifying circuit and couples the output signal to the input branch; and the amplifying circuit receives the signal ofthe input branch, amplifies the signal and outputs the amplified signal. According to the negative feedback type amplifier circuit, the negative feedback signals are obtained through coupling, the negative feedback circuit is used for replacing a parallel negative feedback resistor in a traditional parallel negative feedback type amplifier, so that power loss is reduced, and the noise coefficientlower than that of a parallel resistor scheme under the same feedback coefficient can be achieved in a working frequency band, and higher output third-order intermodulation power is achieved.
Description
technical field [0001] The invention belongs to the field of circuits, and in particular relates to a negative feedback amplifier. Background technique [0002] The amplifier is a device that amplifies the input signal, and the core device is a triode or transistor. Amplifiers are widely used in electronic devices such as signal, radar, television and automatic control, and people have also made many improvements to the use of amplifiers. The working principle of the negative feedback amplifier is to process the amplified signal, and then input it to the input terminal of the amplifier circuit as a feedback signal. The effect of mixing the negative feedback signal and the input signal is smaller than the original input signal, forming a negative feedback signal. feedback. [0003] The gain of the amplifier will be reduced after the negative feedback circuit is introduced, but the negative feedback circuit can also reduce the nonlinear distortion of the amplifier, broaden t...
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Login to View More IPC IPC(8): H03F1/34
CPCH03F1/34Y02D30/70
Inventor 孔令甲周彪王建许向前宋学峰韩玉朝张磊彭同辉李玺孙雷王旭东石光楠郭业达朱菲顾浩波
Owner THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP