Dynamic class-4 FET amplifier

Details Dynamic class-4 FET amplifier Dynamic class-4 FET amplifier

1982-03-18

1984-07-24

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330296, 330281, H03F 316, H03G 310

Patent

active

044620047

ABSTRACT:
The present invention relates to a linear, class A FET amplifier circuit capable of providing linear amplifier of input signals with a time-varying envelope function. An envelope detector (12) is responsive to an input signal (v.sub.i (t)) for extracting the envelope signal (V.sub.i (t)) therefrom. A gate controller (16) subsequently adds the envelope signal to a predetermined gate bias voltage (E.sub.G) and applies the sum (E.sub.G (t)) as the "d-c" gate input to the FET amplifier (14). Therefore, the gate bias voltage is dynamically controlled by the envelope of the input signal, resulting in a significant improvement in the power-added efficiency (.eta..sub.added) over prior art class A FET amplifiers.

REFERENCES:
patent: 3961280 (1976-06-01), Sampei
patent: 3984783 (1976-10-01), Bickley
patent: 4054843 (1977-10-01), Hamada
patent: 4077013 (1978-02-01), Morez et al.
patent: 4115739 (1978-02-01), Sano et al.
patent: 4220929 (1980-09-01), Talbot et al.

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