Patent ID: 7525376
Filing Date: 2009-04-28
Classification: H03F

Abstract:
1. A power amplifier having an input to receive an input voltage and an output to provide a compensated output voltage to a load, the power amplifier comprising: a voltage compensation stage, coupled to the output of the power amplifier, to provide a voltage compensation signal indicative of a voltage level of the compensated output voltage provided to the load; a first summing stage, coupled to the input of the power amplifier and the voltage compensation stage, to receive the input voltage and the voltage compensation signal and provide a first output signal based upon a difference between the input voltage and the voltage compensation signal; a voltage gain stage, coupled to the first summing stage, to receive the first output signal from the first summing stage and provide an adjusted output voltage that is based upon the first output signal; an impedance compensation stage, coupled to the output of the power amplifier, to provide an impedance compensation signal based upon an amount of current provided to the load; a second summing stage, coupled to the voltage gain stage and the impedance compensation stage, to receive the adjusted output voltage and the impedance compensation signal and provide a second output signal based upon a sum of the adjusted output voltage and the impedance compensation signal; and a power gain stage coupled to the second summing stage and the output of the power amplifier, to receive the second output signal and to adjust the voltage level of the compensated output voltage and the amount of current provided to the load.