Patent ID: 6073001
Filing Date: 2000-06-06
Classification: H03D

Abstract:
A method of down-converting a received, high-frequency signal with improved suppression of time varying second order effects, the method comprising the steps of:branching the received signal into first and second branched signals having respective first and second parallel signal paths;providing oscillator signals;mixing said branched signals in said first and second parallel signal paths with the oscillator signals, said oscillator signals being relatively shifted 0.degree. and 180.degree., respectively for said first and second branched signals, respectively;low-pass filtering said mixed first and second branched signals; andcombining said filtered first and second branched signals into a single output signal such that the second order effects are substantially leveled out, the step of combining comprising superposing each of said filtered first and second branched signals wherein the desired down-converted signal components are added to each other while the time varying second order effects are subtracted out from each other.