Hardware-controlled automatic intermediate-frequency gain control method for vector network analyzer
A technology of vector network analysis and gain automatic control, which is applied in the direction of gain control, amplification control, transmission monitoring, etc., and can solve the problems of affecting the measurement speed of the whole machine and taking too much time
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[0014] refer to figure 2 and image 3 , the present invention is implemented by the following method:
[0015] The gain automatic control circuit is added to the intermediate frequency channel of the vector network analyzer, the pre-detection circuit obtains the signal power value at the current frequency point, the window of the gain switch is set through the window comparison circuit and the signal obtained by the detection is compared, and the comparator The output directly controls the IF gain switch, and sends the switch status to the CPU, and the CPU directly obtains the current frequency point data and the current gain status flag and compensates the IF analog gain.
[0016] Gain automatic control is realized by a hardware circuit. The circuit scheme is as follows: After the intermediate frequency signal is input, it is divided into two channels through the unequal power divider, and the channel with higher power is processed by intermediate frequency filtering, contro...
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