AFT circuit

Details AFT circuit AFT circuit

1979-10-29

1981-04-21

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455202, 3581951, 334 16, H04B 116

Patent

active

042636752

ABSTRACT:
An automatic fine tuning (AFT) circuit includes a frequency discriminator for discriminating an intermediate frequency signal, a capacitor supplied with the discriminated intermediate frequency signal to produce an AFT voltage thereacross, a comparator circuit for comparing the AFT voltage with a reference voltage, a first switching transistor controlled by the comparator circuit and which supplies and charges the capacitor with the reference voltage during a channel selection operation when the AFT voltage is less than the reference voltage, a second switching transistor controlled by the comparator circuit and which connects the capacitor to ground to discharge the same during a channel selection operation when the AFT voltage is greater than the reference voltage, and a third switching transistor for rendering the comparator circuit operative during a channel selection operation and inoperative during an AFT operation.

REFERENCES:
patent: 3069637 (1962-12-01), Seeley
patent: 3824474 (1974-07-01), Sakamoto
patent: 3922609 (1975-11-01), Grohmann
patent: 3939427 (1976-02-01), Mueller
patent: 3987399 (1976-10-01), Yokoyama
patent: 4005256 (1977-01-01), Arumugham
patent: 4079320 (1978-03-01), Mogi

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