DPSK_ON_DSBSC

Published:2009/7/6 1:12:00 Author:May | From:SeekIC

Differential phase-shift keyed double-sideband suppressed-carrier signal is demodulated by reinsertion of missing carrier, using synchronous or coherent detection. Receiver input signal is multiplexed by locally generated carrier, accurately controlled in frequency and phase. This is followed by low-pass filtering. Demodulation at output is by frequency/phase controlled loop that automatically locks local oscillator in frequency and phase to received vestige of carrier. This extracts phase information from modulated signal. Power divider is BF Associates H22, quad hybrid is Merrimac Research QHT-2, 0°and 90° phase detectors are Relcom M6A, and multiplier is Analog Devices 4281. Article covers theory and operation of circuit in detail.-R. Hennick, Demodulate DPSK Signals Coherently Using a Costas Phase-Lock Loop, EDN Magazine, July 1, 1972, p 44-47.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/DPSK_ON_DSBSC.html

Print this Page | Comments | Reading(3)