Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1976-10-12
1977-09-20
Griffin, Robert L.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
325316, 325317, 325319, 330 22, 330 28, H04B 106
Patent
active
040500225
ABSTRACT:
The present invention relates to an AM-FM receiver suitable for integrated circuit fabrication and having improved mode conversion means. The AM-FM receiver had a d.c. coupled IF broadband IF amplifier comprising a plurality of stages of emitter coupled transistor pairs. A d.c. feedback network is provided to balance the individual stages and to generate a control potential for further use in mode conversion. In the FM mode, the IF amplifier operates with a high, stable gain at the FM IF frequency with gain reduction for noise suppression purposes below the FM IF frequency. Frequency dependent noise suppression is provided by a capacitance associated with the degenerative network. In the AM mode, the IF amplifier operates at a controllable, medium gain with the degenerative effect on IF gain restored at the AM IF frequency by the addition of capacity to the degenerative network. A control bus, energized by the degenerative network, is used for gain control purposes in the AM tuner and for mode conversion in the AM tuner, the AM-FM detector, and separate portions of the AM and FM audio circuitry.
REFERENCES:
patent: 3665507 (1972-05-01), Peil
patent: 3898576 (1975-08-01), Fukaya
patent: 3922615 (1975-11-01), Sobajima
patent: 3936750 (1976-02-01), Peil et al.
patent: 3999138 (1976-12-01), Peil
McFadyen Robert J.
Peil William
Baker Carl W.
General Electric Company
Griffin Robert L.
Lang Richard V.
Masinick Michael A.
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