Abstract
While the linear phase filters are widely used for the task of filtering without signal distortion, there are many signal processing applications that call for bandpass filters with nonlinear phase and/or non-symmetric magnitude response. Either or both of these may be attained with a single SAW filter. This chapter reviews the techniques for designing SAW filters with arbitrary amplitude and /or phase response. An important market for SAW filters with nonlinear phase response is a high-cost, low volume one for chirp filters employed for radar signal processing. The design of a SAW filter with nonsymmetric amplitude and /or nonlinear phase response can perhaps be best appreciated by considering the operation of an IDT as corresponding to that of a sampled data structure. SAW devices are inherently analog ones. For normal analog filtering applications, these can operate linearly with input powers to the order of 20 dBm. In some coding configurations, they are required to operate in a nonlinear mode. It is the unique structure of an IDT that gives the SAW device its versatility in both analog and digital signal processing circuits and systems. The realization of arbitrary amplitude and /or phase response with bidirectional IDTs using split-electrode geometry can be attained using finger-weighting technique.
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