Broadband radio frequency receiver

The invention relates to a broadband radio frequency receiver and belongs to the technical field of wireless communication electronics. The broadband radio frequency receiver comprises a radio frequency front end module, an analog base band module and a digital baseband module; a zero-intermediate frequency receiver structure with orthogonal down conversion frequency is adopted; a radio frequency input signal sequentially passes through a low noise amplifier, a passive mixer, a trans-impedance amplifier, a low pass filter, a gain variable amplifier, an analog-digital converter, a decimation filter and a finite impulse response (FIR) filter; multiple radio frequency input signals within 50MHz to 6.3GHz can be processed by switching a low noise amplifier group and configuring local oscillation frequency, a sampling clock, filter bandwidth and the like; an external band-pass filter is not needed, so that the complexity of the system is reduced and the integration level is improved; a working frequency band is wi