Patent ID: 7408363
Filing Date: 2008-08-05
Classification: G01R

Abstract:
1. A method of calibrating a signal path of a signal analysis system for processing acquired signal samples using an arbitrary load comprising the steps of: acquiring sets of samples in the time domain of a signal under test from a device under test via the signal path including a plurality of selectable impedance loads with the signal path for each set of samples having a selected impedance load of the plurality of selectable impedance loads; converting the sets of samples of the signal under test in the time domain to a spectral domain representations; characterizing transfer parameters of the device under test within a spectral domain from the spectral domain representations of the sets of samples; defining a reflection coefficient (Γ computing arbitrary load open circuit voltages within a spectral domain from the characterized transfer parameters of the device under test and the reflection coefficient (Γ computing an equalization filter from the arbitrary load open circuit voltages and the spectral domain representation of one of the sets of samples with the equalization filter adapted to represent the loading of the device under test by the arbitrary load; converting the computed equalization filter from the frequency domain to a time domain equalization filter; acquiring at least an additional set of samples in the time domain of the signal under test from the device under test via the signal path including the selectable impedance load of the set of samples used for computing the equalization filter; and processing the additional set of samples using the time domain equalization filter to effect thereby a representation of the arbitrary loading of the device under test.