Power amplifier and method therein

摘要

A power amplifier circuit is provided which comprises an input terminal for receiving an input signal and an output terminal for providing an output signal, and at least one transistor for amplifying the input signal to provide the output signal, and a module for controlling the input signal received at the input terminal, and a module for generating a control signal which substantially follows the temperature of the at least one transistor at least in a selected temperature range. The module for controlling the input signal controls the input signal such that the control signal is prevented from exceeding a pre-determined level. The level corresponds to a pre-determined temperature of the at least one transistor which is equal to or below a specified maximum temperature for the at least one transistor.