Patent ID: 7271658
Filing Date: 2007-09-18
Classification: H03F

Abstract:
1. An electric component for a high frequency power amplifier which incorporates a high frequency power amplifier as a semiconductor integrated circuit including an amplifying transistor for amplifying and outputting a transmitting signal, a power source circuit supplying operating voltage to the high frequency power amplifier in which the operating voltage produced by the power source circuit can be controlled by a control signal based on amplitude information, the electric component comprising: a temperature detecting device which is provided over a semiconductor chip formed with the amplifying transistor; and a temperature detector which is provided over the semiconductor chip formed with the temperature detecting device or a different semiconductor chip, wherein temperature detecting device outputs a first signal in accordance with the semiconductor chip, and wherein the temperature detector receives the first signal, compares the first signal with two different comparison levels based on the state of the temperature detecting device, determines whether the temperature of the semiconductor chip formed with the temperature detecting device is above a predetermined temperature or not, outputs a signal indicating abnormality above a first comparison level, and outputs a signal indicating normality below a second comparison level corresponding to a temperature lower than the temperature corresponding to the first comparison level.