Power amplifier circuit

A power amplifier circuit comprising:

• a first transistor group comprising a plurality of unit transistors, and configured to amplify an input signal and output an amplified signal;
• a bias circuit configured to supply a bias current or a bias voltage to a base or a gate of each of the plurality of unit transistor of the first transistor group;
• a first resistive element for one of the plurality of unit transistors of the first transistor group, the first resistive element being connected between the base or the gate of the one of the plurality of unit transistors of the first transistor group and an output of the bias circuit;
• and
• a second resistive element for the one of the plurality of unit transistors of the first transistor group, the second resistive element being connected between an emitter or a source of the one of the plurality of unit transistors of the first transistor group and a reference potential, wherein:
• the power amplifier circuit is formed on a semiconductor substrate, and
• the first resistive element is formed on the semiconductor substrate further away from the one of the plurality of unit transistors of the first transistor group than the second resistive element.

A power amplifier circuit comprising:

• a first transistor group comprising a plurality of unit transistors, and configured to amplify an input signal and output an amplified signal;
• a bias circuit configured to supply a bias current or a bias voltage to a base or a gate of each of the plurality of unit transistor of the first transistor group;
• a first resistive element for one of the plurality of unit transistors of the first transistor group, the first resistive element being connected between the base or the gate of the one of the plurality of unit transistors of the first transistor group and an output of the bias circuit;
• a second resistive element for the one of the plurality of unit transistors of the first transistor group, the second resistive element being connected between an emitter or a source of the one of the plurality of unit transistors of the first transistor group and a reference potential;
• and
• a capacitive element for the one of the plurality of unit transistors of the first transistor group, one end of the capacitive element being supplied with the input signal, and another end of the capacitive element being connected to the base or the gate of the one of the plurality of unit transistors of the first transistor group, and
• wherein, in the planar view, the capacitive element is formed between the one of the plurality of unit transistors of the first transistor group and the first resistive element.

A power amplifier circuit comprising:

• a first transistor group comprising a plurality of unit transistors, and configured to amplify an input signal and output an amplified signal;
• a bias circuit configured to supply a bias current or a bias voltage to a base or a gate of each of the plurality of unit transistor of the first transistor group;
• a first resistive element for one of the plurality of unit transistors of the first transistor group, the first resistive element being connected between the base or the gate of the one of the plurality of unit transistor of the first transistor group and an output of the bias circuit;
• a second resistive element for the one of the plurality of unit transistors of the first transistor group, the second resistive element being connected between an emitter or a source of the one of the plurality of unit transistors of the first transistor group and a reference potential;
• and
• a third resistive element connected at one end to the output of the bias circuit and at another end to the first resistive element.