Gain compensation circuit

Details Gain compensation circuit Gain compensation circuit

1992-08-27

1993-12-28

Mullins, James B.

Amplifiers

With distributed parameter-type coupling means

Distributed amplifier

330277, 330286, 330304, 330289, 333 28R, H03F 3193

Patent

active

052743390

ABSTRACT:
A circuit for compensating for GaAs FET amplifier gain variations over a frequency band as a function of temperature. The circuit includes a passive equalizer circuit having a fixed gain over the frequency band and an active equalizer circuit having a gain which varies over the frequency band as a function of temperature. The passive and active equalizers are coupled in series. The active equalizer circuit comprises varactor diodes in a low pass filter arrangement with the bias voltage of the varactor being provided by an external driver controlled by a temperature sensitive thermistor. As the value of the varactor's junction capacitance is increased (as a function of the temperature controlled bias voltage), the cutoff frequency of the low pass filter decreases.

REFERENCES:
patent: 3423535 (1969-01-01), Hochgraf et al.
patent: 4967169 (1990-10-01), Sun et al.

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