FET buffer amplifier

Details FET buffer amplifier FET buffer amplifier

1991-09-05

1992-10-13

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330293, 330300, 330311, H03F 316

Patent

active

051554496

ABSTRACT:
An FET buffer amplifier having a serially connected input FET and bias current FET. The drain or source current of the input FET is detected by a detection resistor and the detected voltage is negatively fed back to the gate of the bias current FET so that the source current of the input FET is maintained at a fixed value. This can achieve a low output impedance, high input impedance, wideband buffer amplifier with a simple circuit.

REFERENCES:
patent: 2358428 (1944-09-01), White
patent: 4761615 (1988-08-01), Maloberti et al.
Fjarlie, "Photo Diode Preamplifier Systems: Low-Wise Positive-Feedback", Applied Optics, vol. 16, No. 2, pp. 385-392, Feb. 1977.
Oswald, "Class B Emitter-Follower", IBM Technical Disclosure Bulletin, vol. 8, No. 10, Mar. 1966, pp. 1447-1448.

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