US 10,476,439 B2 · Power amplifier circuit

Abstract

A power amplifier circuit includes a first amplifier transistor and a bias circuit. The first amplifier transistor amplifies a first signal and outputs a second signal. The bias circuit supplies a bias voltage or a bias current to the first amplifier transistor. The first amplifier transistor includes plural unit transistors disposed in a substantially rectangular region. The bias circuit includes first and second bias transistors and first and second voltage supply circuits. The first and second bias transistors respectively supply first and second bias voltages or first and second bias currents to the bases of unit transistors of first and second groups. The first and second voltage supply circuits respectively supply first and second voltages to the bases of the first and second bias transistors. The first and second voltages are decreased in accordance with a temperature increase. The second voltage supply circuit is disposed within the substantially rectangular region.

Claims20

Dependent claims

A power amplifier circuit comprising:

a first amplifier transistor that amplifies a first signal inputted into an input terminal and outputs a second signal;
and
a bias circuit that supplies a bias voltage or a bias current to the first amplifier transistor,
the first amplifier transistor including a plurality of unit transistors,
the bias circuit including
a bias transistor that supplies a bias voltage or a bias current to a base of a unit transistor among the plurality of unit transistors, and
a voltage supply circuit that supplies a voltage to a base of the bias transistor, wherein at least one element in the voltage supply circuit is disposed within an area formed by the outermost unit transistors among the plurality of unit transistors.

4 more elements

A power amplifier circuit comprising:

a first amplifier transistor that amplifies a first signal inputted into an input terminal and outputs a second signal;
and
a bias circuit that supplies a bias voltage or a bias current to the first amplifier transistor,
the first amplifier transistor including
a plurality of unit transistors of a first group and a plurality of unit transistors of a second group,
the bias circuit including
a first bias transistor that supplies a first bias voltage or a first bias current to a base of a unit transistors of the first group among the plurality of unit transistors,
a second bias transistor that supplies a second bias voltage or a second bias current to a base of a unit transistors of the second group among the plurality of unit transistors,
a first voltage supply circuit that supplies a first voltage to a base of the first bias transistor, and
a second voltage supply circuit that supplies a second voltage to a base of the second bias transistor,
wherein at least one element in the second voltage supply circuit is disposed within an area formed by the outermost unit transistors of the second group among the plurality of unit transistors.

8 more elements

Dependencies are inferred from the claim text.

Power amplifier circuit

Life of this patent

Power amplifier circuit

Life of this patent

Abstract

Claims20