High frequency power amplifier module

Details High frequency power amplifier module High frequency power amplifier module

2005-12-06

2005-12-06

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S133000

Reexamination Certificate

active

06972627

ABSTRACT:
The present invention provides a power amplifier module used in a cellular phone or the like. In the power amplifier module, a bias control circuit converts a bias voltage to a current by MOS transistors, whereby a voltage drop is reduced and the value of the bias voltage is lowered. Bias control signals outputted from the bias control circuit are inputted to a high-frequency amplifying unit through low-pass filters. The low-pass filter comprises an inductance, and a condenser. Each of the condensers attenuates an envelope frequency. Each of the inductances suppresses a change in impedance at a carrier frequency of a modulation signal.

REFERENCES:
patent: 6690237 (2004-02-01), Miyazawa
patent: 2001-127701 (2001-05-01), None

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