Patent ID: 7068099
Filing Date: 2006-06-27
Classification: H03F

Abstract:
1. A power amplifier module comprising a first amplifier ( 2 ) having a first front-end ( 4 ) and a first backend amplifier stage ( 5 ) and a second amplifier ( 3 ) having a second front-end ( 6 ) and a second backend amplifier stage ( 7 ), the first amplifier and the second amplifier being arranged in a Bridge Tied Load (BTL) configuration with feedback over the load, characterized in that the first and the second backend amplifier stages having point symmetrical transfer functions with respect to the origin, the input current (i 1 ) of the first backend amplifier stage being substantially equal to the input current (i 2 ) of the second backend amplifier stage, wherein at least the first front-end amplifier stage comprises a voltage controlled current source ( 10 ), an output terminal ( 11 ) of the voltage controlled current source supplying the input current (i 1 ) for the first backend amplifier stage and the output terminal ( 13 ) of the voltage controlled current source being connected to an input terminal ( 20 ) of the second backend amplifier stage.