Patent ID: 6263289
Filing Date: 2001-07-17
Classification: G01R

Abstract:
A method of enhancing the dynamic range of intermodulation distortion (IMD) measurements comprising the steps of:applying a signal source over a first path to a device under test (DUT);measuring with a measuring instrument through a power combiner the signal power out of the DUT to form a reference power, including measuring any spectral components of IMD power introduced by the DUT, the signal source and the measuring instrument;applying a concellation signal over a second path through level and phase conditioning components and the power combiner to the measuring instrument to cancel the signal over the first path to remove the main channel power introduced from the DUT and the spectral components of IMD power introduced by the signal source amplified by the DUT, and;measuring the DUT introduced spectral components of power to enhance the dynamic range measurement.