Linear power amplifier using active bias for high efficiency and

Details Linear power amplifier using active bias for high efficiency and Linear power amplifier using active bias for high efficiency and

1995-12-04

1998-04-14

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

330296, H03F 368

Patent

active

057397236

ABSTRACT:
A Doherty-type active bias power amplifier (90) suitable for satellite telecommunication systems provides linear amplification of noise-like RF input signals (100) that have multiple carriers spread over a large instantaneous bandwidth. As RF input signal (100) to active bias power amplifier (90) increases, the negative pinch-off voltage that normally causes development of a negative voltage on the gate/base is precluded from occurring in the carrier amplifier (115) and thus an improvement in RF output power is achieved as well as an increase in the dynamic RF input drive range over which high efficiency operation can be achieved. Active biasing provides the proper bias-on point for the peaking amplifier (135) in order to achieve maximum RF efficiency operation.

REFERENCES:
patent: 5420541 (1995-05-01), Upton et al.
patent: 5541554 (1996-07-01), Stengel et al.
"Improving The Power-Added Efficiency of FET Amplifiers Operating With Varying-Envelope Signals" by Adel A.M. Saleh and Donald C. Cox from 1983 IEEE.

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