B39122B1665U510W3

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SAW Filters: B39122B1665U510W3 Application Field and Working Principle

Surface Acoustic Wave (SAW) filters are frequency selective, primarily used for radio frequency (RF) signal processing. SAW technology offers a wide variety of highly advanced RF-microwave filters with features like wide passband and sharp attenuation of unwanted RF energy. The B39122B1665U510W3 is a SAW filter designed for use in dual band GSM cellular handsets. This article examines the application field and working principle of the B39122B1665U510W3.

Application Field

The B39122B1665U510W3 is designed as a dual band GSM cellular SAW filter. It offers a wide stopband and a narrow passband to provide signal isolation between the transmit and receiver channels. This filter is ideal for use in dual band GSM standard-compliant mobile handsets. It can also be used to eliminate interference between voice and data signals in GPRS multi-slot applications. Additionally, it can be used in the baseband signal-filtering section of mobile radio terminals.

Working Principle

SAW filters are constructed out of a piezoelectric substrate and an electrical interconnect pattern on the surface. As an RF signal propagates through the filter, it induces a surface acoustic wave (SAW) on the surface of the substrate. This wave travels along the substrate in a direction approximately perpendicular to the electrical interconnect pattern. The signal is reflected at the interconnect points and travels back along the substrate. The frequency response of the filter is determined by the design of the interconnect pattern, and multiple passes of the signal result in resonant frequencies at which the signal is amplified.

The B39122B1665U510W3 is designed with an interconnect pattern optimized for dual band GSM applications. The filter offers a passband with 3dB center frequency variation of ±2.5% and a stopband attenuation of up to 50 dB. It is constructed using high quality dielectric materials and narrow passband edges for low insertion loss and good frequency selectivity.

The filter is tuned and stored in an environmentally sealed package, ensuring reliable and consistent performance in demanding conditions. The filter also features an integrated temperature compensation mechanism, which allows for a 1 ppm/°C tuning coefficient across its operating temperature range.

Conclusion

The B39122B1665U510W3 is a dual band GSM cellular SAW filter designed for use in mobile handsets. It offers a wide stopband and a narrow passband to provide signal isolation between the transmit and receiver channels. The filter is constructed with an interconnect pattern optimized for dual band GSM applications, and its integrated temperature compensation mechanism allows for a 1 ppm/°C tuning coefficient across its operating temperature range. This makes the B39122B1665U510W3 an ideal choice for use in dual band GSM cellular handsets.

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