Low voltage automatic frequency control switch for a radio recei

Details Low voltage automatic frequency control switch for a radio recei Low voltage automatic frequency control switch for a radio recei

1989-06-29

1993-05-25

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551922, 455344, 323281, 323316, H04B 118, G05F 140

Patent

active

052147959

ABSTRACT:
An AFC switch circuit is controlled by an select input logic signal for providing a selected output signal to control the local oscillator in a miniature FM receiver. The output signal has a voltage equal to either an AFC signal voltage for AFC operation of the receiver, or a reference voltage for synthesized operation of the receiver. The AFC switch circuitry employs bipolar transistors in current mirror configurations to minimize voltage offset and to enhance isolation between the unselected input and the output while operating on a power supply voltage less than 3 volts.

REFERENCES:
patent: 4731574 (1988-03-01), Melbert
patent: 4758773 (1988-07-01), Fushimi et al.
patent: 4857862 (1989-08-01), Brokaw
patent: 4885802 (1989-12-01), Ragan

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