Variable frequency passband circuit

Details Variable frequency passband circuit Variable frequency passband circuit

1983-02-04

1985-05-07

Miller, Stanley D.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455296, 455 26, 307540, 307543, 328138, 328165, H03H 1102, H03H 1104

Patent

active

045160783

ABSTRACT:
A variable frequency passband circuit comprising two passband filters and three mixers (front, intermediate and output mixers) connected in a cascade fashion disposed in a signal path. Two VCOs inject frequency signals into the front mixer and the output mixer. The two VCOs are respectively controlled by control signals at two potentiometers through transfer switching means so that the synthetic passband of the filter may be varied. One potentiometer suppresses the higher frequency region of a baseband signal and the other potentiometer suppresses the lower frequency region of the base band signal, irrespective of USB or LSB receiving mode.

REFERENCES:
patent: 2998517 (1961-08-01), Beckerich
patent: 4267605 (1981-05-01), Matsuzawa et al.
patent: 4310803 (1982-01-01), Kurihara et al.
patent: 4357549 (1982-11-01), Miller

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