Patent ID: 6424213
Filing Date: 2002-07-23
Classification: H03F

Abstract:
An amplifier for amplifying a main signal, the amplifier comprising:a main amplifier operable to receive the main signal and generate an amplified signal having a main component and an error component; a second amplifier coupled in a feed-forward arrangement to the main amplifier and operable to receive an input signal and to generate an output signal having a main component and an error component; a third amplifier coupled in parallel to the second amplifier and operable to generate an output signal having a main component and an error component; a balancing network coupled to the main amplifier and to the second and third amplifiers, the balancing network operable to isolate a sample of the error component of the amplified signal, invert the sample, and combine the sample with the input signal to the second and third amplifiers; and a combiner where the amplified signal from the main amplifier and the output signals of the second and third amplifiers are combined such that the error component of the amplified signal and the error components of the output signals of the second and third amplifiers substantially cancel one another and the main component of the amplified signal and the main components of the output signals of the second and third amplifiers are added to one another.