Tuner circuits and voltage generators therefor

Details Tuner circuits and voltage generators therefor Tuner circuits and voltage generators therefor

1987-02-24

1988-12-20

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, 334 15, H04B 126

Patent

active

047929898

ABSTRACT:
In a tuner circuit, the relatively high voltage used to control a varactor diode of the circuit is derived using a cascade of resistors and transistors under the control of a reference voltage input. The breakdown voltage of each transistor is significantly less than the output voltage of the cascade and is such that the cascade can be implimented in the same semiconductor chip as high frequency, low voltage process, synthesiser components.

REFERENCES:
patent: 4365348 (1982-12-01), Fujimoto
patent: 4368541 (1983-01-01), Evans
patent: 4646360 (1987-02-01), Muterspaugh
patent: 4710993 (1987-12-01), Suzuki

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