Signal amplifier circuit with a field effect transistor having c

Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier

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330 17, 330 18, 330 22, 330 24, 330 40, 330149, H03F 316, H03F 130

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040084426

ABSTRACT:
A signal amplifier circuit using a field effect transistor having current unsaturated characteristics like a triode vacuum tube. The field effect transistor has drain and source electrodes coupled respectively through drain and source resistors to first and second different potential points between which a supply voltage may be applied. In the present invention the first potential point is coupled to the source electrode of the field effect transistor by an impedance means to render the signal amplifier circuit insensitive to variation in the supply voltage. The impedance means may be an active or passive element such as a bipolar transistor or resistor.

REFERENCES:
patent: 3286189 (1966-11-01), Mitchell et al.
patent: 3369186 (1968-02-01), Lejon
patent: 3389344 (1968-06-01), Fichtner
patent: 3516003 (1970-06-01), Boone
patent: 3828230 (1974-08-01), Nishizawa et al.

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