Power amplifier module, frontend circuit, and communication device

A power amplifier module, comprising:

• a substrate having a first ground conductive pattern, a second ground conductive pattern, and a third ground conductive pattern;
• a first power amplifier on the substrate and having a collector, an emitter, and a first input terminal;
• a second power amplifier on the substrate and having a collector and a second input terminal connected to the collector of the first power amplifier;
• and
• a first bypass capacitor connected to the collector of the second power amplifier, wherein:
• the emitter of the first power amplifier is connected to the first ground conductive pattern;
• the first bypass capacitor is connected to the second ground conductive pattern, and
• the third ground conductive pattern connects the first ground conductive pattern to the second ground conductive pattern.

A power amplifier module, comprising:

• a substrate having a first ground conductive pattern, a second ground conductive pattern, and a third ground conductive pattern;
• a first power amplifier on the substrate and having a collector, an emitter, and a first input terminal;
• a second power amplifier on the substrate and having a collector and a second input terminal connected to the collector of the first power amplifier;
• a first bypass capacitor connected to the collector of the second power amplifier;
• a first wiring inductor on the first ground conductive pattern;
• and
• a second wiring inductor on the second ground conductive pattern, wherein:
• the emitter of the first power amplifier is connected to the first ground conductive pattern,
• the first bypass capacitor is connected to the second ground conductive pattern, and
• the third ground conductive pattern connects the emitter of the first power amplifier and the first wiring inductor to the first bypass capacitor and the second wiring inductor.