Bias optimized fet mixer for varactor tuner

Details Bias optimized fet mixer for varactor tuner Bias optimized fet mixer for varactor tuner

H - Electricity

03

D

325/115

H03D 7/12 (2006.01)

Patent

CA 1078023

ABSTRACT OF THE DISCLOSURE A field effect transistor is used as the mixer in a VHF varactor turner by the use of self-adjusting bias. Maximum conversion gain can be realized when the oscillator injection voltage is low, and low intermodulation and cross modulation products can be realized at higher oscillator injection voltages. Self-adjusting bias 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 ensures constancy of FET input and output capacitances, thus preventing the tuner's tuned circuits from being detuned and variable loaded.

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