Bias optimized FET mixer for varactor tuner

Details Bias optimized FET mixer for varactor tuner Bias optimized FET mixer for varactor tuner

1975-02-13

1976-08-24

Griffin, Robert L.

325319, 325439, 325457, H04B 128

Patent

active

039769445

ABSTRACT:
A field effect transistor may be used as the mixer in a VHF varactor tuner by the use of self-adjusting bias. Both maximum conversion gain can be realized when the oscillator injection voltage is low and low intermodulation and cross modulation products realized at higher oscillator injection voltages. Bias modification is achieved by use of the tuning voltage in a bias control circuit where FET drain current is adjusted while FET bias voltage is maintained substantially constant. Keeping the bias voltage for the FET substantially constant insures constancy of the FET input and output capacitance which in turn preserves the tuner's tuned circuits from being detuned and variably loaded.

REFERENCES:
patent: 3348154 (1967-10-01), Fish, Jr. et al.
patent: 3493869 (1970-02-01), Van Dijkum
patent: 3581211 (1971-05-01), Maitland
patent: 3626302 (1971-12-01), Nakamura
patent: 3694756 (1972-09-01), Carlson
patent: 3863136 (1975-01-01), Hanson

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