Wigner distribution analysis of SAW filters

The application of a mixed time-frequency representation, the Wigner distribution (WD), to the analysis of the transfer function of a surface acoustic wave (SAW) filter is discussed. The utility for signal analysis and practical aspects of the computational implementation of the WD and of two smoothed versions of the WD are discussed. Criteria for the separation and identification of second-order effects are listed. Second-order effects of a broadband delay line incorporating chirped transducers with a center frequency of 380 MHz and a fractional bandwidth of 52% are analyzed. Signals overlapping in the time and frequency response are separated and the origin of these spurious signals is identified using the WD.<>