Transistor power amplifier for portable terminals for mobile com

Details Transistor power amplifier for portable terminals for mobile com Transistor power amplifier for portable terminals for mobile com

1997-08-27

2000-09-19

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including gain control means

330302, H03G 330, H03F 3191

Patent

active

061218413

ABSTRACT:
In a transistor power amplifier, a base of a power amplifying bipolar transistor is connected with a gain control power source via a bias resistor. The power amplifying transistor is directly biased from the gain control power source via the bias resistor, and not via a base driving bipolar transistor so as to widen an effective gain control voltage range by an amount corresponding to an ON-state voltage across a base and emitter of the base driving bipolar transistor.

REFERENCES:
patent: 5023569 (1991-06-01), Raven

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