Patent ID: 6838938

Claim:
A communication system ( 1 ) comprising a power amplifier ( 10 ) for amplifying an input signal (In_S) and emitting an amplified signal (O_S), the communication system ( 1 ) further comprising a detector ( 20 ) and a Bias Generator (BG) ( 30 ), the communication system ( 1 ) being characterized in that the detector ( 20 ) comprises a controlled amplifying means for generating an output signal (Th_S) said output signal being indicative for the power of the input signal (InS), the output signal (Th_S) having a controllable bias level, the BG ( 30 ) comprises a Level Sensitive Current Generator (LSCG) ( 301 ) for generating a current (Cc) controlled by the output signal (Th_S), the controllable threshold level of said signal being adaptable to the LSCG ( 301 ), said LSCG ( 301 ) having a threshold level (TL) such that when the signal (Th_S) is lower than the threshold level (TL) the current (Cc) is substantially zero, otherwise the current (Cc) being linearly controlled by the signal (Th_S), the BG ( 30 ) further comprises an adapter ( 302 ) coupled to the LSCG ( 301 ) comprising a current controlled adapting means for generating a control signal (C_S) for controlling a property of the amplifier, the control signal (C_S) having a controllable linear dependency on the current (Cc).