FET amplifier and bias power supply circuit for commonly amplify

Details FET amplifier and bias power supply circuit for commonly amplify FET amplifier and bias power supply circuit for commonly amplify

1996-05-22

1997-09-23

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330296, H03F 316

Patent

active

056709110

ABSTRACT:
A radio frequency FET amplifier has an FET which commonly amplifies a plurality of radio frequency signals and a bias power supplying circuit which varies bias power supplied to the FET according to the number of inputted radio frequency signals. A DC/DC converter controls supply voltage according to control voltage corresponding to the number of inputted radio frequency signals, thus generating a converter output voltage proportional to the control voltage. A constant current circuit supplies drain voltage substantially equal to the voltage to the drain terminal of the FET and also supplies gate voltage to the gate terminal of the FET so as to hold the drain current therein substantially constant. Power consumption is reduced depending on changes in the number of inputted radio frequency signals, while suppressing variations of harmonic distortion component peak level and frequency characteristics.

REFERENCES:
patent: 5371477 (1994-12-01), Ikeda et al.
patent: 5406225 (1995-04-01), Iida et al.
"NEC Microwave Devise Data Book", 1992, pp. 506, NEC Corporation (No month).
Stephen A. Mass, "Nonlinear Microwave Circuits", published by Artech House, Inc., pp. 64-65, 1988 (No month).

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