AM demodulator

Details AM demodulator AM demodulator

2006-01-10

2006-01-10

Chin, Stephen (Department: 2634)

Pulse or digital communications

Receivers

Amplitude modulation

C375S376000, C375S140000, C375S324000, C329S347000, C332S115000

Reexamination Certificate

active

06985540

ABSTRACT:
An AM demodulator includes an APC detection circuit that compares phases of an AM-modulated input signal and a signal output from a VCO. However, the APC detection circuit multiples the two signals before their comparison. As a result, even if the phases of the input signal or the signal output from the VCO is shifted by 180 degrees, the result of comparison by the APC detection circuit is not influenced by the phase shift. Moreover, when a signal detected by the AM detection circuit is in a potential range showing over-modulation, operation of a PLL circuit is stopped.

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patent: 2002/0191117 (2002-12-01), Matsugaki et al.
patent: 2005/0036254 (2005-02-01), Premerlani et al.
patent: 6-6139 (1994-01-01), None

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