A Frequency Calibration System of Electric Duplexer
A technology of duplexer and ESC, applied in the field of communication, can solve the problems of deviation of center frequency, inability to determine whether the frequency is accurate, affecting the normal operation of communication equipment, etc. Effect
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[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0032] figure 1 It is a block diagram of a frequency calibration system of an electronically adjustable duplexer of the present invention. The frequency calibration unit 1 drives the generator tuning filter 4, and simultaneously controls the first switch 2 and the second switch 3, so that the coupling end of the generator tuning filter 4 is connected to the input end of the low noise amplifier 8, and the frequency calibration unit 1 receives the processed The output signal of the low-noise amplifier 8 is converted, amplified, filtered, and processed by a programmable gate circuit FPGA to output a specified frequency to change the frequency of the power-tuning filter 4 . Then, the frequency calibration unit 1 drives the receiving electric tuning filter 5, and simultaneously controls the first switch 2 and the second switch 3, so that the output end of the rad...
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