TEMPERATURE COMPENSATED SAW WITH HIGH QUALITY FACTOR

With the introduction of tactile smart phones, and the mobile web, the cumulative annual growth rate (CAGR) for mobile data traffic surged to over 100%. With the CAGR remaining near 50% [1], global mobile data demand is expected remain strong. To meet the demand, greater efficiencies for existing spectrum, and new spectrum, will be required. Therefore, the growth of mobile data traffic drives a demand for larger quantities and improved performance of acoustic filters. By using analytic solutions for Chebyshev filters, the performance specifications for filters may be translated into required acoustic resonator performance metrics. Temperature compensated SAW (TCSAW) filters with high quality factors (Q) are well suited to meet the stringent requirements of low frequency LTE bands. The technology innovations, essential to high-Q TCSAW, are summarized and their performance metrics of TCSAW are compared to those required to meet the LTE band specifications. Finally, some representative TCSAW duplexer responses are presented.