Deep blanking rapid start-stop switching circuit

An input end and an output end of a filter bank are respectively connected with a single-pole multi-throw switch I and a switch II, the filter bank comprises a plurality of filters with different band-passes, a local oscillator amplifier controls a power supply through a switch III, and a generated local oscillator signal is input into a frequency mixer; a high-frequency interference signal passes through the filter bank to output a filtering signal, passes through the frequency mixer to output an intermediate-frequency signal, the high-frequency interference signal is input into the filter bank through the first attenuator, the filtering signal passes through the second attenuator to be input into the frequency mixer, and the intermediate-frequency signal is output through the third attenuator to be used by a post-stage processing circuit. The input end and the output end of the attenuator III are respectively provided with a filter II and a filter III, the switch I, the switch II and the switch III are cont