Wideband low noise amplifier with noise cancellation

摘要

A low noise amplifier has integral noise cancellation to provide a low noise figure and operation over a frequency range of 0.5 GHz-50 GHz. An amplifier amplifies an input signal as well as noise present with the amplified signal and amplified noise being out of phase and in phase, respectively, with the corresponding inputs. A feedback circuit that is non-linear with frequency enables a constant amplification. A summation circuit combines amplified signals with the noise being cancelled since two combined noise signals being summed are 180 degrees out of phase to each other. An optional secondary amplification stage provides additional amplification. Preferably, the amplifier, auxiliary amplifier and the summation device utilize CMOS transistors disposed on an SOI substrate with impedance stabilization over the frequency range.