Device and method for bi-directional amplification with a JFET

Details Device and method for bi-directional amplification with a JFET Device and method for bi-directional amplification with a JFET

1990-04-27

1991-10-15

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including field effect transistor

455 84, H03F 316

Patent

active

050577913

ABSTRACT:
A bi-directional amplifier having two symmetrical and versatile impedance matching circuits with a JFET therebetween, and a method for bi-directional amplification using a JFET. Each junction of the JFET may be a drain or a source depending on the direction of amplification. Each impedance matching circuit provides a low impedance for the junction that is a source and a high impedance for the junction that is a drain. The impedance is varied by adding a first capacitor parallel to a resonating inductor and a second capacitor, which is removed or inserted in series with the load, responsive to the direction of amplification. The frequency of the signal being amplified may be different for each direction.

REFERENCES:
patent: 3519765 (1970-07-01), Huber
patent: 4590437 (1986-05-01), Butler et al.
Schilling, Donald L. and Belove, Charles, Electronic Circuits: Discrete and Integrated, McGraw-Hill 1979 pp. 145-146.

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