Patent ID: 7064608
Filing Date: 2006-06-20
Classification: H03F

Abstract:
1. An amplifier circuit, for providing noiseless amplification of an input signal having a carrier, comprising: a primary amplifier having an input for receiving said input signal and an output for providing an amplified output signal, a first circuit means, connected to said input and said output, for isolating amplifier generated noise, said first circuit means including a first modulator connected to said input, a second modulator connected to said output, a first combiner connected to said first and second modulators and an error amplifier connected to said first combiner, whereby said first and second modulators receive and modulate said input and output signals, respectively, to match the amplitude and shift the phase by 180 degrees of said input and output signals, and said first combiner combines said input and output signals to isolate said amplifier generated noise, a second circuit means, connected to said first circuit means and to said output, for superpositioning said amplifier generated noise onto said output signal to cancel said amplifier generated noise from said output signal, and a third circuit means, connected to said input and to said first circuit means, for mixing said input signal and amplifier generated noise to produce a first control signal, and modulating one of said input signal and said output signal in response to said first control signal.