B39765B1727H810 Filters

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Surface acoustic wave (SAW) filters are resonant frequency components, used in modern radio-frequency (RF) systems for band-pass filtering, switching and delay. An example of a SAW filter is the B39765B1727H810. In this article, its application field and working principle will be discussed in order to provide a better understanding of this device and its uses.

Application Field

The B39765B1727H810 is a high-frequency filter manufactured by Infineon Technologies. It is specifically designed for 3G mobile communication systems, and finds use in multi-band cellular phones, personal digital assistants (PDAs) and base station systems. It is well-suited for GSM, DCS, PCS, TDSCDMA, CDMA2000 and PHS bands. Additional applications include wireless LAN and other radio applications.

Working Principle

SAW filters involve acoustic waves propagating along the crystalline surface of piezoelectric materials such as quartz. These waves are generated by the transducers known as interdigital transducers (IDTs) and these include electrodes in the form of interleaved fingers. When an electrical signal is applied to the IDT, it creates an electric field, which generates a mechanical wave in the quartz, as the electrode fingers deform differently in the presence of an electric field. This generates an acoustic wave, which propagates along the surface of the quartz.

When the B39765B1727H810 is energized, it creates a standing wave, which is when the outgoing wave is reflected back and its amplitude superimposes with the incident wave, creating a standing wave. This phenomenon helps to operate the SAWe filter at the resonant frequency. The SAW filter is designed so that the desired frequency response is obtained. The main parameter that determines the filter\'s frequency response is the number of electrodes and the reciprocal spacing between them. Thus, by varying these parameters, different frequency responses can be achieved to suit different applications.

The filter also contains a damping resistance, which can be used to adjust the passband ripple and stopband attenuation. At the resonant frequencies of the filter, there is an increase in the acoustic resistance of the filter, which helps to attenuate the signal. This helps to reduce the amount of noise that can travel through the filter. This could be very important in certain applications where very low noise levels are required.

Conclusion

The B39765B1727H810 is a high-frequency SAW filter specifically designed for 3G mobile communication systems. It is well-suited for GSM, DCS, PCS, TDSCDMA, CDMA2000 and PHS bands. Its working principle involves acoustic waves propagating along the crystalline surface of piezoelectric materials such as quartz, generated by the interdigital transducers (IDT). The desired frequency response is obtained by varying two parameters - the number of electrodes and the reciprocal spacing between them. The filter also contains a damping resistance, which can be used to adjust the passband ripple and stopband attenuation. All of these features make the B39765B1727H810 an ideal choice for any RF system.

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