High frequency amplifier

Details High frequency amplifier High frequency amplifier

2005-04-26

2005-04-26

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S133000

Reexamination Certificate

active

06885246

ABSTRACT:
The present invention provides a high frequency amplifier using a power supply voltage regulate circuit for the purpose of compensating for variations in power supply voltage. The high frequency amplifier comprises three-stage power amplifiers which amplify an input signal and output the amplified signal, a bias circuit which supplies bias voltages for controlling these power amplifiers, a regulate circuit which compensates for variations in noise or gain with respect to the variations in the power supply voltage for driving the power amplifiers, etc. The regulate circuit holds constant an output voltage Vddc with respect to variations in power supply voltage Vdd and outputs the constant-held output voltage Vddc as a power supply voltage for the power amplifiers.

REFERENCES:
patent: 5251331 (1993-10-01), Schwent et al.
patent: 6433639 (2002-08-01), Numanami et al.
patent: 6636114 (2003-10-01), Tsutsui et al.

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