Multi-level demodulator and VCO circuit

Details Multi-level demodulator and VCO circuit Multi-level demodulator and VCO circuit

1995-12-01

1997-09-09

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329325, 331 11, 331 25, 375327, 375376, H04L 2738, H03L 7087

Patent

active

056660847

ABSTRACT:
A multi-level demodulator has a VCO (32) and two reference frequency sources (50, 41). A relatively long time-constant loop (45, 47) has an input coupled to the VCO, an input coupled to one of the reference frequency sources (41) and an output coupled to the VCO. A relatively short time-constant loop (51, 30) has an input coupled to the VCO, an input coupled to the other reference frequency source (50) and an output coupled to the VCO.

REFERENCES:
patent: 4365211 (1982-12-01), Lee
patent: 4803705 (1989-02-01), Gillingham et al.
patent: 4807252 (1989-02-01), Ikegami et al.
patent: 5142246 (1992-08-01), Petersson
patent: 5157355 (1992-10-01), Shikakura et al.
patent: 5446411 (1995-08-01), Horsfall et al.

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