Improved characterization of feed-forward noise cancellation scheme for microwave amplifiers

The application of feed forward correction principles to cancel noise in amplifiers has proven an efficient tool for enhancing noise performance of microwave amplifiers beyond the present state of the art. An improved experimental characterization of the scheme is presented with results from several amplifiers working at X-band, confirming the validity of the approach with more than 25 dB of noise cancellation for both white and flicker noise. A description of the improved measurement system used to characterize the noise cancellation is also presented, together with a discussion of the limits of the cancellation scheme.