The design and fabrication techniques used to produce SAW 6-pole Butterworth filters at a center frequency of 217 mHz are discussed. The complex and stringent frequency requirements, better than 10 ppm, of coupling 6 individual poles t ogether requires simple yet accurate modeliny t echniques and a reproducible fabrication and trimming process. The approach used in this work is to use the two-pole acoustic section as the basic building block. The response of the two-pole section is then modeled on a microprocessor using a standard AC circuit analysis program. The results from this analysis are used in fabricating and combining the sections. Calculated and measured results are presented.

http://ieeexplore.ieee.org/iel5/10283/32716/01534957.pdf

R. Chapman

Papers

The Deep Inlaid Interdigital Transducer