H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/79
H04B 1/26 (2006.01) H03D 5/00 (2006.01) H03G 3/14 (2006.01) H03G 3/30 (2006.01) H04B 1/16 (2006.01)
Patent
CA 1075773
34 EL 1305 ABSTRACT OF THE DISCLOSURE The present invention relates to an AM-FM receiver suitable for integrated circuit fabrication and having improved mode conversion means. The AM-FM receiver has a d.c. coupled IF broadband IF amplifier comprising a plurality of stages of emitter coupled transistor pairs. A d.c. feed back network is provided to balance the individual stages and to generated 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 degerative 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.
263793
Mcfadyen Robert J.
Peil William
LandOfFree
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