Circuit for tunable radio-frequency circuits

Details Circuit for tunable radio-frequency circuits Circuit for tunable radio-frequency circuits

1980-11-10

1983-01-18

Heyman, John S.

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

307310, 331176, H03J 724, H03J 304

Patent

active

043694179

ABSTRACT:
A circuit is provided for frequency drift compensation of a tuning diode in tunable RF-circuits, and comprises a temperature-responsive voltage divider coupled between an independent voltage supply source and a reference potential, the tuning diode being coupled to a tap of the voltage divider. In this circuit the separate tuning voltage source is not loaded down and may thus produce a tuning voltage which is independent of the variation of the voltage from the temperature compensation portion of the circuit.

REFERENCES:
patent: 2811647 (1957-10-01), Nilssen
patent: 3428916 (1969-02-01), Hovenga et al.
patent: 3777289 (1973-12-01), Makino
patent: 4015218 (1977-03-01), Sanderson
patent: 4195274 (1980-03-01), Suganuma

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