Patent ID: 6531918
Filing Date: 2003-03-11
Classification: H03F

Abstract:
A high power, pilotless, feed-forward RF amplifier comprising:a first loop comprising an adjustment circuit connected to receive an input signal, a high power amplifier operating in a non-linear operating range for amplifying an output of the adjustment circuit, a delay element coupled to the received input signal, and a combiner for differencing an output of the delay element and an output of the power amplifier for producing an error signal, a second loop comprising a second delay element coupled to the output of the power amplifier, a variable gain-phase circuitry coupled to the combiner output, an error amplifier coupled to the output of the gain-phase circuitry, and a coupler for adding the output of the error amplifier to the output of the second delay element, and a by-pass gain-phase circuit coupled to the received input signal for injecting a gain-phase modified input signal for amplification by said error amplifier, and a controller circuitry for adjusting at least the variable gain-phase circuitry and the adjustment circuit for obtaining a reduction in distortion energy in the output signal.