Patent ID: 6527722
Filing Date: 2003-03-04
Classification: G01S

Abstract:
A wide dynamic range continuous wave (CW) Doppler receiver that operates in a fully differential mode, comprising:a differential fixed frequency output mixer configured to receive a radio frequency (RF) input signal and supply a differential signal output; a differential fixed frequency bandpass filter coupled to the differential fixed frequency output mixer and configured to provide a differential fixed frequency output; an in-phase mixer and a quadrature-phase mixer, each configured to receive a differential signal output of the differential fixed frequency bandpass filter; at least one in-phase differential low-pass filter configured to receive the output of the in-phase mixer and supply a filtered in-phase signal; at least one quadrature-phase differential low-pass filter configured to receive the output of the quadrature-phase mixer and supply a filtered quadrature-phase signal; an in-phase and quadrature-phase fixed differential high-pass clutter filter; and an analog-to-digital converter configured to receive the filtered in-phase signal and the filtered quadrature-phase signal and supply a corresponding in-phase digital output and a corresponding quadrature-phase digital output, the outputs of the analog-to-digital converter supplied to a memory element.