WIDEBAND LOW NOISE AMPLIFIER WITH NOISE CANCELLATION

摘要

A low noise amplifier (1305) has integral noise cancellation to provide a low noise figure and operation over a frequency range of 0.5GHz - 50GHz. 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 and which comprises an inductor (L₂) in series with a first resistor (R₁), and a second resistor (R₂) in parallel with the inductor (L₂), 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. A secondary amplification stage (1315) provides additional amplification. The amplifier, auxiliary amplifier and the summation device utilize CMOS transistors disposed on an SOI substrate with impedance stabilization over the frequency range.