SWD FM receiver circuit

Details SWD FM receiver circuit SWD FM receiver circuit

1974-07-22

1976-03-02

Mayer, Albert J.

325388, 325437, 325451, H04B 126

Patent

active

039421201

ABSTRACT:
An FM tuner for feeding an IF section of a receiver circuit includes an antenna signal input circuit with broad band response to signals in a selected FM broadcast band. A mixer is connected to receive the signal from the input circuit and a variable local oscillator is connected to the mixer operating for high side injection to produce an IF signal centered within an RF band of minimal signal content and to produce an image displaced outside the response of the input circuit. An SWD filter connected to the output of the mixer has narrow band response at the IF frequency.

REFERENCES:
patent: 3372337 (1968-03-01), Beres
patent: 3525046 (1970-08-01), Bourget
patent: 3541451 (1970-11-01), Lind
patent: 3575660 (1971-04-01), Jorgensen
patent: 3581211 (1971-05-01), Maitland et al.
patent: 3626300 (1971-12-01), Kennedy
patent: 3639840 (1972-02-01), Shekel et al.
patent: 3663747 (1972-05-01), Janssen
patent: 3787612 (1974-01-01), DeVries et al.
patent: 3863136 (1975-01-01), Hanson

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