Transistor amplifier having field effect transistors with stabil

Details Transistor amplifier having field effect transistors with stabil Transistor amplifier having field effect transistors with stabil

1975-11-10

1977-05-03

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330 22, 330 24, 330 30D, 330 35, H03F 316

Patent

active

040217469

ABSTRACT:
A transistor amplifier is comprised of a first differential amplifier for receiving an input signal and a second differential amplifier coupled to the output of the first differential amplifier. An output stage is coupled to the second differential amplifier and is comprised of a pair of complementary field effect transistors connected in push-pull configuration. Each of the field effect transistors has triode-type dynamic characteristics and is adapted to receive both a bias voltage and an amplified signal from the output of the second differential amplifier. Changes in the operating voltage supplied to the field effect transistors are injected into one of the differential amplifiers so as to effect a corresponding change in the bias voltage which is applied to the field effect transistors. This bias voltage change compensates for changes in the operating voltage so as to stabilize the field effect transistor drain currents at a constant value notwithstanding these operating voltage changes.

REFERENCES:
patent: 3493881 (1970-02-01), Zuch
patent: 3723896 (1973-03-01), Flickinger
patent: 3828230 (1974-08-01), Nishizawa et al.
patent: 3851269 (1974-11-01), Szore
patent: 3851270 (1974-11-01), Vosteen
patent: 3921089 (1975-11-01), Tsurushima

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