Patent ID: 7138862
Filing Date: 2006-11-21
Classification: H03F,H05K

Abstract:
1. A power amplifier comprising: a first amplifier element configured to amplify a first input signal of a first frequency, the first amplifier element including a first input terminal which receives the first input signal, and a first output terminal which outputs a first output signal obtained by amplifying the first input signal; a second amplifier element configured to amplify a second input signal of a second frequency different from the first frequency, the second amplifier element including a second input terminal which receives the second input signal, and a second output terminal which outputs a signal obtained by amplifying the second input signal; a power supply input terminal connected to a direct-current power supply; a common power supply path including an end connected to the power supply input terminal, and another end; a non-zero impedance element disposed in the common power supply path; a first individual power supply path including an end connected to the another end of the common power supply path, and another end connected to the first output terminal, the first individual power supply path having a first impedance; and a second individual power supply path including an end connected to the another end of the common power supply path, and another end connected to the second output terminal, the second individual power supply path having a second impedance different from the first impedance.