AFC circuit and IC of the same adapted for lower heterodyne conv

Details AFC circuit and IC of the same adapted for lower heterodyne conv AFC circuit and IC of the same adapted for lower heterodyne conv

1993-03-31

1995-04-04

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551922, 4551933, 455257, H04B 116

Patent

active

054045878

ABSTRACT:
An automatic frequency control circuit comprises a variable reactance element connected to a resonance circuit of a local oscillation circuit of an FM receiver, an inverting amplifier to which a demodulation output of an FM demodulation circuit of the FM receiver is supplied, and series circuit of a first resistor and a capacitor connected to an output terminal of the inverting amplifier. A second resistor is connected between an input terminal of the inverting amplifier and a junction between the first resistor and the capacitor, and a circuit supplies a voltage obtained at the junction as an automatic frequency control voltage to the variable reactance element. The polarity of the automatic frequency control voltage is varied by selecting the value of the second resistor. When the automatic frequency control circuit is formed as an IC, the capacitor and the second resistor are formed as elements for external connection.

REFERENCES:
patent: 3230456 (1966-01-01), Griffiths
patent: 3750028 (1973-07-01), Uchida
patent: 3784917 (1974-01-01), Kenyon
patent: 3824474 (1974-07-01), Sakamoto
patent: 3869674 (1975-03-01), Borbely
patent: 4100578 (1978-07-01), Arneson
Patent Abstracts of Japan, vol. 10, No. 133 (E-404) (2190), 17 May 1986.
Wireless World, vol. 80, No. 1463, 1 Jul. 1974, Haywards Heath, UK p. 239 `Improved A.F.C. for F.M. Tuners` *whole abstract*.

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