SF2093E

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SAW filters are acoustic wave devices that use acoustic surface waves (ASW) rather than electronic circuit components as their primary means of signal processing. They can separate a desired signal from other signals of different frequencies, as well as modulate or demodulate signals. SF2093E is a particular type of SAW filter with unique capabilities.

The SF2093E SAW filter is designed for use in cellular communications systems. The frequency range of the SF2093E is from 70 MHz to 490 MHz, with a center frequency of 280 MHz. The filter\'s passband is approximately 40 MHz wide, and its nominal insertion loss is about 2 dB.

The SF2093E is used to filter out-of-band components that can interfere with transmitted and received signals. It can also be used as a bandpass filter, to select signals in a specific frequency range. In addition, it can be used in receiver-IF stages, to enhance the signal-to-noise ratio.

The SF2093E is constructed using multilayer patterned aluminum nitride ceramic and gold microstrip electrodes. It is designed with a differential interdigital structure, which consists of a series of electrodes alternating between high-impedance lines and low-impedance lines. This structure helps eliminate harmonic distortion and improves the Spurious Free Dynamic Range (SFDR).

The working principle of the SF2093E SAW filter is based on the propagation of surface acoustic waves (SAWs) on the aluminum nitride substrate. These waves are generated by an interdigital transducer (IDT), which is an array of fingers that are spaced apart from each other. The SAWs propagate along the surface of the substrate and interact with the gold microstrip electrodes etched onto the surface of the substrate.

The waveform of the SAW is altered in different ways on its path through the filter. As the waveform passes through each electrode, it is amplified and converted into a different frequency. This frequency is determined by the spacing of the electrodes. The spacing between the electrodes is such that only SAWs of a required frequency, or band of frequencies, can pass through the filter.

Incoming signals are compared in amplitude and frequency at both the entrance and exit points of the filter, and the desired signals are allowed to pass through while others are removed. This ensures that only desired signals reach the receiver. The SF2093E SAW filter is thus an effective solution for reducing interference and enhancing the performance of cellular communication systems.

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