Nonlinearity characterisation of microwave detectorsfor radiometer applications
Tapani Närhi · Electronics Letters · 1996
The accuracy of microwave radiometers is affected by the deviation of the detector from the ideal square-law behaviour. A method is presented for determining the error caused by higher order nonlinearities, based on the experimental characterisation of the nonlinearities with a two-tone test. In actual operation with Gaussian noise as the input signal, the error caused by higher order nonlinearities is found to be greater than that with sinusoidal input signal.