Polarization circuit and method of supply voltage of polarization for a power amplifier has several floors

摘要

The present invention relates to a bias circuit for a power amplifier with several étages.selon the invention, the bias circuit is characterized in that it comprises a first power supply circuit of polarization (22b) in order to apply a specific biasing to a bipolar heterojunction transistor of a first power amplifier stage, and a second power supply circuit of polarization (22c) for controlling a power supply of each transistor of a bipolar heterojunction of the second power amplifier stage and the subsequent stage of amplification of the power and the subsequent stage of the power amplifier according to the control signal of a control circuit (17) [invention finds application in the field of mobile telephones.