Method of Demodulating Phase Shift Keyed Signal
Original Publication Date: 1988-Jan-01
Included in the Prior Art Database: 2005-Feb-14
This article describes a circuit arrangement for demodulating binary phase shift keyed (BPSK) signals. The circuit arrangement uses the transient phase response of a high queue parallel tank circuit, slightly detuned from the incoming sinusoid, to cause a sudden phase change. Referring to the figure, the received BPSK input signal S(t) is passed through amplitude limiter 1 in order to eliminate any amplitude variation that may be present in the incoming signal. The output from the limiter is sent to a high queue parallel tank circuit. The tank circuit generates a transient phase error. The output from the high queue parallel tank circuit is passed through a second amplitude limiter 2 which eliminates any amplitude variation in the signal.