Phase demodulator and portable telephone apparatus

Details Phase demodulator and portable telephone apparatus Phase demodulator and portable telephone apparatus

2005-12-12

2008-11-11

Chang, Joseph (Department: 2817)

Demodulators

Phase modulation demodulator

C329S313000

Reexamination Certificate

active

07449945

ABSTRACT:
A phase demodulator has a high frequency amplifier which amplifies a received signal modulated by phase, a voltage control oscillator which conducts oscillation operation in tune with the received signal amplified by the high frequency amplifier, a phase comparator which detects a phase difference between an output signal of the voltage control oscillator and a reference oscillation signal, and a demodulator which conducts demodulation process based on the phase difference.

REFERENCES:
patent: 3997848 (1976-12-01), Rippy
patent: 4174505 (1979-11-01), Querry
patent: 2003/0118143 (2003-06-01), Bellaouar et al.
patent: 2003/0153286 (2003-08-01), Bisanti et al.
patent: 3052614 (2000-04-01), None

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