Patent ID: 8665000
Filing Date: 2014-03-04
Classification: H03D

Abstract:
1. A method of frequency down-converting an input signal having a first frequency to an output signal having a second frequency, comprising: generating a first local oscillator signal as a square wave having: generating a second local oscillator signal as a modified square wave having: wherein the first and second local oscillator signals are generated such that they have a phase shift of π/2 between them, such that the first local oscillator signal has a delay of 1/4 of the cycle period compared to the second local oscillator signal; mixing the input signal with the first local oscillator signal to form a first down-converted signal; mixing the input signal with the second local oscillator signal to form a second down-converted signal; multiplying at least one of the down-converted signals by a pre-calculated factor; and adding the two resulting down-converted signals to form the output signal.