Broadband demodulator with self-adaptive working mode

The invention belongs to the field of radio frequency receiver systems, particularly relates to a broadband demodulator with a self-adaptive working mode, and aims to solve the problems that the stability of a direct-current bias working point of a broadband demodulator in the prior art is difficult to guarantee, and high performance and high stability cannot be synchronously realized. The low-noise transconductance amplifier is used for acquiring a differential input signal and acquiring a differential current output signal; the double-balance passive mixer is used for generating a frequency conversion signal based on the differential current output signal and a common-mode feedback signal; the transimpedance amplifier is used for converting the frequency conversion signal into an output voltage; and the adaptive bias follower is used for generating a common-mode feedback signal according to the working state of the double-balanced passive mixer. The current mode demodulator architecture based on the low-noi