Patent ID: 8854989

Claim:
A transmitter feedback device, comprising: a multi-channel frequency selection band-pass circuit, configured to receive a multi-frequency band feedback signal including feedback signals of at least two frequency bands coupled at a downlink line between a transmitter downlink radio frequency channel and an antenna, and output a feedback signal of each of the at least two frequency bands in the multi-frequency band feedback signal in a time-division manner; a feedback local oscillator, configured to generate a feedback local oscillation corresponding to each of the at least two frequency bands in a time-division manner; a mixer, configured to mix the feedback signal of each of the at least two frequency bands from the multi-channel frequency selection band-pass circuit and the feedback local oscillation corresponding to each of the at least two frequency bands from the feedback local oscillator to output an intermediate frequency signal of each of the at least two frequency bands in a time-division manner; and an analog to digital converter, configured to perform an analog to digital conversion on the intermediate frequency signal of each of the at least two frequency bands to obtain a digital signal of each of the at least two frequency bands.