SF2172C

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Surface acoustic wave (SAW) filters are a type of electronic filter, used in many modern communication systems. The SF2172C is a SAW filter designed to meet the stringent requirements of the mobile communications and broadcasting markets. It offers excellent performance with low insertion loss, low group delay variation and small package size.

The SF2172C operates on the principle of passing only a specific resonance frequency in the signal path while rejecting all other frequencies.

In operation, an electrical signal is input into the filter where it is converted to acoustic energy by piezoelectric transducers. The acoustic energy propagates along the surface of the filter substrate and is reflected back to the front of the filter. The reverse conversion of the reflected wave returns the output signal to its electrical form.

The filtered output is only generated when the frequency of the input signal matches the resonant frequency of the filter. This enables the device to act as a band-pass filter, passing a specific range of frequencies, while rejecting all other frequencies.

The SF2172C is designed for applications in the cellular frequency range, such as CDMA, GSM, DCS, PCS, WCDMA, LTE and WiMax. It can also be applied in other digital mobile communication systems, digital broadcast systems and automotive applications.

The filter consists of a 3-layer thick film technology consisting of a SAW filter, an etched comb line filter and a lumped capacitor. The SAW filter provides the carrier filtering for the signal and the comb filter is used for the near-in harmonic rejection. The lumped capacitors provide the DC bias for the SAW filter.

The SF2172C filter has excellent characteristics that make it suitable for applications such as frequency hopping systems, diversity receivers, repeaters and repeater systems. It offers an extremely low insertion loss of 0.5dB, low group delay variation of the passband signals and wide band rejection up to 50dB. It also has excellent linearity, excellent repeatability, and low temperature drift.

In addition, the SF2172C filter has a small package size of 0.100” x 0.400”, which makes it ideal for use in tight space applications where component size is a factor. It is also RoHS compliant and has a temperature range of -55 degrees Celsius up to +85 degrees Celsius.

The SF2172C filter is an excellent choice for applications that require high performance in a compact package. It provides excellent harmonic rejection, wide band rejection, low group delay variation and low insertion loss. Additionally, its small package size makes it ideal for applications that require a high degree of integration.

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