Patent ID: 6255907
Filing Date: 2001-07-03
Classification: H03F

Abstract:
A power amplifier comprising current supply circuitry (PS1, PS2), an input stage (A1) and an output stage (A3, PA1, PA2) for delivering power to a load (LOAD) connected to the output of said output stage by a proximal load terminal (7) and additionally has a distal load terminal (6), whereinsaid input stage is terminated by a transconductance amplifier (A1) for converting an input signal voltage (U.sub.i) to a current signal (I.sub.in) to the signal input (3) of said output stage,wherein a bypass resistor (R) is connected between the signal input (3) of said output stage (A3, PA1, PA2) and said distal load terminal (6),wherein said proximal load terminal (7) is signal grounded,wherein said output stage is constituted by a current amplifier (A3, PA1, PA2) for delivering a power current signal to said load (LOAD), said bypass resistor (R) converting the current signal (I.sub.in) to a voltage signal (V) which substantially constitutes the power voltage signal for the load, said output stage and said bypass resistor thus constituting a combined current amplification and voltage amplification stage, andwherein said current supply circuitry (PS1, PS2) for the output stage is arranged as a floating supply and between the distal load terminal (6) and the output stage (A3, PA1, PA2) so that the power current signal passes through said current supply circuitry (PS1, PS2).