| 摘要 |
A power amplifier designed for delivering high power to a load (LOAD) comprises an input stage (A1) that converts an input voltage (u1) to a current signal (iin) which is applied to an end stage comprising a current amplifier stage (A3, PA1, PA2) and a bypass-resistor (R). The output terminal (7) of the current amplifier stage is connected to earth, and the current supply (PS1, PS2) is arranged floating relative to signal earth, so that the power current signal through the load (LOAD) also passes through the current supply (PS1 or PS2). A correction amplifier (A2) is preferably connected so as to measure the voltage across the end stage (A3, PA1, PA2) and provide a correction current (ikorr) to balance the voltage difference across the current amplifier stage and remove the effect of non-linearities in the current amplifier stage.
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