Phase detection circuit

Details Phase detection circuit Phase detection circuit

1986-04-11

1987-08-11

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 329137, 375 94, 328155, H04L 706

Patent

active

046864849

ABSTRACT:
A phase detector demodulates a carrier wave which is modulated by a phase shift keying (PSK), a quadrature amplitude modulation, or a similar digital modulated wave. The detector detects the phase difference between an analog signal and a reference clock signal. The analog signal is sampled at the frequency of the clock signal and provides a first k-bit digital signal. A delay circuit samples the first digital signal at one-half of the reference signal frequency in order to produce a second k-bit digital signal. A multiplier multiplies the first and second digital signals and gives a phase difference signal.

REFERENCES:
patent: 4286223 (1981-08-01), Shearer
patent: 4504960 (1985-03-01), Yamada

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