Patent ID: 7046091
Filing Date: 2006-05-16
Classification: H03F

Abstract:
1. A power amplifier comprising: a field effect transistor, a bias voltage supply terminal supplied with a positive bias voltage, a reference potential, a first resistance element, and a second resistance element with a temperature coefficient smaller than that of the first resistance element, wherein a first terminal of the first resistance element and a first terminal of the second resistance element are connected and the connection point of the first terminal of the first resistance element and the first terminal of the second resistance element is connected to a gate terminal of the field effect transistor, a second terminal of the first resistance element is connected to the bias voltage supply terminal, a second terminal of the second resistance element is connected to the reference potential, the field effect transistor and the first resistance element are semiconductor devices formed on the same semiconductor substrate, and a resistance value of the second resistance element is variable.