Phase demodulator receiving inputs from phase detector and binar

Details Phase demodulator receiving inputs from phase detector and binar Phase demodulator receiving inputs from phase detector and binar

1994-02-09

1995-04-11

Grimm, Siegfried H.

Demodulators

Phase modulation demodulator

Input signal combined with local oscillator or carrier...

375328, 455214, H03D 320

Patent

active

054062187

ABSTRACT:
A demodulation circuit comprises: a phase detection circuit for determining an absolute value of a phase difference between an input signal to be demodulated and a reference signal; a binary phase detection circuit for converting a phase lead or lag between the input signal and the reference signal into a sign of phase difference; and a phase demodulation circuit for calculating, from the absolute value and the sign of phase difference, a phase difference quantity between the input signal and the reference signal and for performing a delay detection on the phase difference quantity; wherein the binary phase detection circuit includes a delay circuit which generates a delay time corresponding to the operation delay of the phase detection circuit; and wherein the phase detection circuit includes a level limiter circuit to limit an internal signal voltage and a reference voltage adjust circuit to correct deviations in the internal signal voltage.

REFERENCES:
patent: 5313170 (1994-05-01), Kojima
White Series No. 105 Linear Digital Modulation Method for Mobile Communication, editor Trikepps Publication Department, publisher Ken Kawauchi, publishing office Trikepps, Ltd., published Mar. 14, 1990, pp. 114-117, 137 and 140. (Provided in Japanese with English translation attached.).

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