B39931B3758H110

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Introduction

B39931B3758H110 is a SAW (Surface Acoustic Wave) filter designed for Receiver (Rx) applications in GSM/EDGE (850/900/1800/1900). The optimized bandwidth and high signal attenuation makes the filter well-suited for use in GSM/EDGE/TD-SCDMA mobile handsets.

Application Field

B39931B3758H110 SAW filter is applied in GSM/EDGE/TD-SCDMA Rx applications up to 1.8 GHz, requiring high rejection ratio in both 900MHz and 1800MHz bands. It is ideal for use in new platform requirements such as 2G/3G dual-mode handsets that take advantage of the maximum integration in two in one filter component. The individual components are tuned “on spectrum” for best RF, dynamic performance when assembled on printed circuit board.

Working Principle

As its name implies, B39931B3758H110 filter works by using acoustic wave propagation instead of wires to create signals. Surface acoustic wave (SAW) propagation works by sending high-frequency signals through a material medium, such as a ceramic substrate, and the medium “reflects” the signal, allowing some of the energy from the input signal to pass through, while blocking other frequencies.

SAW filters have several advantages over conventional electrical filters, including smaller size, lower power consumption, and higher cut-off frequencies. They also have a fast response time due to the quick time it takes to propagate the high-frequency signals. This makes them particularly suitable for radio frequency receivers, where the collected signal needs to be quickly analyzed and filtered before amplifying.

B39931B3758H110 filter operates using a combination of Bragg cells and interdigital transducers. The transducers, which are printed on top of the substrate material, generate the required acoustic waves, while the Bragg cells are used to create the desired filter response.

The SAW filter is designed to meet the GSM/EDGE standard performance requirements. This is achieved by selecting the precise filter parameters, such as pass band, rejection band, group delay, insertion loss, and the Q-factor. The exact specifications are determined by the substrate material, transducer design, acoustic wave shape, and the number of interdigital transducers used. The result is a highly optimized filter design that meets the required performance.

Conclusion

B39931B3758H110 is a SAW filter designed for use in GSM/EDGE/TD-SCDMA receivers. The filter works by using acoustic waves to propagate the signal, with Bragg cells and interdigital transducers providing the desired filter response. The filter parameters are finely tuned to meet the GSM/EDGE standard performance requirements, allowing for optimized bandwidth and high signal attenuation.

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