US 2001/0024141 A1 · Semiconductor power amplifier and multistage monolithic integrated circuit

Abstract

There are disclosed a semiconductor power amplifier and a microwave monolithic integrated circuit which can be reduced in size and cost and which can sufficiently inhibit loop oscillation. The semiconductor power amplifier of the present invention comprises first and second transistors connected in parallel, a capacitor element connected between a signal input terminal and a base terminal of the first transistor, a capacitor element connected between the signal input terminal and a base terminal of the second transistor, and a resistance element connected between the respective base terminals of the first and second transistors. Since the capacitor element and resistance element are disposed, a loop oscillation signal can sufficiently be attenuated on a loop oscillation path. Moreover, in the present embodiment, since miniaturization is possible, MMIC can easily be constituted.

Claims18

Dependent claims

A semiconductor power amplifier for amplifying a high frequency signal inputted to a signal input terminal by first and second transistors connected in parallel to each other to output the amplified signal via a signal output terminal, said semiconductor power amplifier comprising:

a first capacitor element connected between said signal input terminal and an input terminal of said first transistor;
a second capacitor element connected between said signal input terminal and an input terminal of said second transistor;
and
a first impedance element connected between the respective input terminals of said first and second transistors.

1 more element

A semiconductor power amplifier for amplifying a signal inputted to a signal input terminal by first and second transistors connected in parallel to each other to output the amplified signal via a signal output terminal, said semiconductor power amplifier comprising:

a first inductor element and a first capacitor element connected in series between said signal input terminal and an input terminal of said first transistor;
a second inductor element and a second capacitor element connected in series between said signal input terminal and an input terminal of said second transistor;
a first impedance element connected between the respective input terminals of said first and second transistors;
a third inductor element connected between an output terminal of said first transistor and said signal output terminal;
and
a fourth inductor element connected between an output terminal of said second transistor and said signal output terminal.

3 more elements

Dependencies are inferred from the claim text.

Semiconductor power amplifier and multistage monolithic integrated circuit

Life of this patent

Semiconductor power amplifier and multistage monolithic integrated circuit

Life of this patent

Abstract

Claims18