Patent ID: 9215117
Filing Date: 2015-12-15
Classification: H04L

Abstract:
1. An amplitude shift keying (ASK) demodulator comprising: an envelope detector configured to detect an envelope of an ASK modulated signal and to generate an envelope signal; a clock generator configured to generate a main clock signal and first through n-th clock signals, where n is a positive integer of at least 2; a plurality of elementary demodulators each configured to sample the envelope signal using a first sampling clock signal and a second sampling clock signal, and to output first through n-th elementary demodulated signals based on a difference between the sampled envelope signals using the first sampling clock signal and the second sampling clock signal; and a post signal processor configured to generate a final demodulated signal using at least one of the first through n-th elementary demodulated signals, wherein the main clock signal comprises n pulses in a predetermined unit period, wherein the first through n-th clock signals have different phases to one another and each of the first through n-th clock signals has a frequency equal to a 1/n frequency of the main clock signal.