Patent ID: 6483381
Filing Date: 2002-11-19
Classification: H03D

Abstract:
A demodulation method comprising:a) receiving a modulated input signal having an input signal frequency; b) generating a first switch control signal at a first switching frequency substantially equal to said input signal frequency; c) generating a second switch control signal having the same frequency as the first switch control signal and having a phase approximately 90 degrees different from a phase of the first switch control signal; and d) controlling at least two switching circuits with said first and second switch control signals for obtaining at least two sets of sampled amplitudes of input signals for generating switching output signals for each of said switching circuits defined by subtracting said sampled amplitudes when said first switch control signal is high by said sampled amplitudes when said first switch control signal is low for each of said switching circuits to generate demodulated output signals for said modulated input signal.