Radio-frequency emission front-end circuit with automatic gain control
A technology of automatic gain control and automatic control circuit, applied in the field of radio frequency communication, can solve the problems of working state change, output signal-to-noise ratio reduction, insensitivity to amplitude change, etc., to improve stability and response speed, and improve system signal-to-noise ratio. , the effect of optimizing the system design
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[0028] The radio frequency transmitting front-end circuit with automatic gain control of the present invention can be used in radio frequency receivers that have high requirements on system output amplitude changes and other system designs that require transmitted output signals to vary within a small range. In addition to the gain amplification of traditional transmitters and the function of driving 50 load, it also has the functions of RF variable gain amplifier and RF variable gain modulator, which can better reduce hardware and system power consumption and improve system signal-to-noise ratio. Optimize system design. The typical structural block diagram of the traditional transmission chain is as follows: figure 1As shown, the signal to be transmitted passes through the digital Gaussian shaping filter circuit 41, and is reshaped and encoded into Manchester or other encoding formats. Through this filtering, the energy of the digital signal can be mainly concentrated in a sy...
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