Tunable device

Details Tunable device Tunable device

1994-03-16

1995-04-18

Mis, David

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329318, 331 16, 331 19, 331 23, 331 44, 435260, 435264, 435340, H03D 300, H03L 100, H03L 700, H03L 720

Patent

active

054081963

ABSTRACT:
A signal receiving device is kept tuned by a tuning signal, which supplied to a tuning input of a tunable circuit in the signal receiving device. The tuning signal is supplied from a memory. The signal receiving device has an operating state and a calibrating state. The calibrating state serves to determine the tuning signal and to store it in the memory. In the calibrating state, a broadband signal source supplies a broadband signal to a band-pass filter. The band-pass filter is tuned to and passes a reference signal to the tunable circuit which provides the signal receiving device with selectivity in the operating state. The response of the tunable circuit to the reference signal is monitored and a tuning signal is selected for which it is measured that the tunable circuit is tuned to the reference signal which is passed by the band-pass filter.

REFERENCES:
patent: 3059187 (1962-10-01), Jaffe
patent: 4001714 (1977-01-01), Reed
patent: 4847569 (1989-07-01), Dudziak et al.
patent: 4855944 (1989-08-01), Hart
patent: 5179725 (1993-01-01), Camp, Jr. et al.
patent: 5343168 (1994-08-01), Guthrie

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