High frequency power amplifier circuit

Details High frequency power amplifier circuit High frequency power amplifier circuit

2005-01-04

2005-01-04

Le, Dinh T. (Department: 2816)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S271000

Reexamination Certificate

active

06838940

ABSTRACT:
A high frequency power amplifier circuit comprises an input circuit receiving an input signal; a first cascode stage connected to the input circuit and a DC voltage source and comprising at least one FET having a source, a drain, and a gate; an second cascode stage comprising: at least one bipolar transistor having an emitter, a collector and a base and being supplied by the first cascode stage and receiving the input signal from the first cascode stage, and a delimiting means, preferably a diode, connected to the bipolar transistor and adapted to reduce the voltage level at the drain of the FET or the emitter of the bipolar transistor respectively; and an output circuit connected to the second cascode stage and outputting an output signal.

REFERENCES:
patent: 4035712 (1977-07-01), Yarrow et al.
patent: 4132925 (1979-01-01), Schmutzer et al.
patent: 5742205 (1998-04-01), Cowen et al.
patent: 6011438 (2000-01-01), Kakuta et al.

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