The arrival of new wireless standards and their narrowly spaced channels has filter manufacturers scrambling to enhance the performance and footprint of high-quality-factor (high-Q) surface-mount filter technologies. These performance requirements push the limits of discrete, surface-acoustic-wave (SAW), and bulk-acoustic-wave (BAW) filters, forcing filter manufacturers to look to other technologies to meet the needs of handset providers. In pursuit of advanced filter technologies, manufacturers are developing enhanced temperature-coefficient SAW/BAW devices, complete CMOS RF front-end solutions, and RF microelectromechanical-system (MEMS) filters...
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