Phase detector

Details Phase detector Phase detector

1995-06-23

1996-05-28

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329346, 327350, 375324, 375329, 455214, 455337, H03D 302, H04L 2722

Patent

active

055215483

ABSTRACT:
In a phase detector, an input signal (Si) is multiplied in a multiplier by two reference signals intersecting at right angles with each other. Signals obtained by multiplication are passed through filters and subjected to quadrature demodulation. An I signal and a Q signal obtained by quadrature demodulation are input to non-linear compression circuits and compressed by logarithmic conversion. Based on the compressed I and Q signals, a phase detection circuit detects the phase of the input signal (Si).

REFERENCES:
patent: 3255417 (1966-06-01), Gottlieb
patent: 3740750 (1973-06-01), Moulton
patent: 3916316 (1975-10-01), Hearn et al.
patent: 4694195 (1987-09-01), Stueck
patent: 4745309 (1988-05-01), Waller, Jr.
Patent Abstracts of Japan, vol. 017, No. 257 (E-1368), May 20, 1993, & JP-A-05 00299 (Toshiba Corp.), Jan. 8, 1993.
Patent Abstracts of Japan, vol. 013, No. 534 (E-852), Nov. 29, 1989 & JP-A-01 220341 (Toshiba Corp.) Sep. 4, 1989.

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