Receiver having a local oscillator first synchronized to a refer

Details Receiver having a local oscillator first synchronized to a refer Receiver having a local oscillator first synchronized to a refer

1992-06-05

1994-02-01

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Input signal combined with local oscillator or carrier...

329361, 331 11, 331 14, 4552501, 455260, 455314, 455337, H03D 122, H03L 7087, H04B 126

Patent

active

052835324

ABSTRACT:
A receiver array in accordance with the reception principle of synchronous demodulation, in which a controllable oscillator array is pre-synchronized to a set value for the oscillator frequency by a digital first control circuit having a reference frequency source during a pre-synchronization phase, and a heterodyne signal derived from the oscillator frequency is then synchronized with phase locking to the received useful signal by switching the oscillator control input to an analog second control circuit.

REFERENCES:
patent: 3769589 (1973-10-01), Buntschuh et al.
patent: 3946329 (1976-03-01), Caspari
patent: 4146843 (1979-03-01), Isobe
patent: 4205272 (1980-05-01), Kumagai
patent: 4365211 (1982-12-01), Lee
patent: 4461035 (1984-07-01), Sakamoto
patent: 4631499 (1986-12-01), Kasperkovitz
patent: 4905307 (1990-02-01), Frank
Martin Kreuzer: "Ein synchroner Homodynempfanger . . . " Frequenz, 1988, H.5, pp. 147-152.
J. L. Linsley Hood: "Synchrodyne a.m. receiver" Electronics and Wireless World, Jan. 1986, pp. 51-54.
Floyd M. Gardner: "Phaselock Techniques" John Wiley & Sons, New York, 2nd Edition, 1979, pp. 121-125.

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