High-frequency power amplifier

A high-frequency power amplifier that amplifies a high-frequency input signal and outputs a signal having one power selected from a plurality of powers, the high-frequency power amplifier comprising:

• a first output route that is a circuit, which amplifies the input signal and outputs a signal of a first power;
• and
• a second output route that is a circuit, which amplifies the input signal and outputs a signal of a second power,
• wherein the first output route includes:
• a first amplifier that amplifies the input signal;
• a first output matching circuit that is connected to an output node of the first amplifier;
• and
• a first switch element that is connected to an output node of the first output matching circuit, and
• the second output route includes:
• a second amplifier that amplifies the input signal;
• and
• a second switch element that is connected between an output node of the second amplifier and an output node of the first switch element,
• wherein the second switch element comprises transistors that are connected in a plurality of stages.

A high-frequency power amplifier that amplifies a high-frequency input signal and outputs a signal having one power selected from a plurality of powers, the high-frequency power amplifier comprising:

• a first output route that is a circuit, which amplifies the input signal and outputs a signal of a first power;
• and
• a second output route that is a circuit, which amplifies the input signal and outputs a signal of a second power,
• wherein the first output route includes:
• a first amplifier that amplifies the input signal;
• a first output matching circuit that is connected to an output node of the first amplifier;
• and
• a first switch element that is connected to an output node of the first output matching circuit,
• the second output route includes:
• a second amplifier that amplifies the input signal;
• and
• a second switch element that is connected between an output node of the second amplifier and an output node of the first switch element, and
• an input terminal to which the input signal is input,
• wherein the second output route further includes a third switch element that is connected between the input terminal and an input node of the second amplifier.

A high-frequency power amplifier that amplifies a high-frequency input signal and outputs a signal having one power selected from a plurality of powers, the high-frequency power amplifier comprising:

• a first output route that is a circuit, which amplifies the input signal and outputs a signal of a first power;
• and
• a second output route that is a circuit, which amplifies the input signal and outputs a signal of a second power,
• wherein the first output route includes:
• a first amplifier that amplifies the input signal;
• a first output matching circuit that is connected to an output node of the first amplifier;
• and
• a first switch element that is connected to an output node of the first output matching circuit, and
• the second output route includes:
• a second amplifier that amplifies the input signal;
• and
• a second switch element that is connected between an output node of the second amplifier and an output node of the first switch element,
• wherein an output impedance of the first amplifier is about 5Ω, an input impedance of the first output matching circuit in the first output route is about 5Ω, an output impedance of the first output matching circuit in the first output route is about 50Ω, and an output impedance of the second amplifier is about 50Ω.