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Related Concept Videos

Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:

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Modeling, simulation, and design of SAW grating filters.

O Schwelb1, E L Adler, J K Slaboszewicz

  • 1Concordia Eng., Montreal, Que.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 1, 1990
PubMed
Summary

This study presents a systematic method for designing surface acoustic wave (SAW) grating filters, incorporating losses. The approach uses cascadable transmission-matrix building blocks for accurate modeling and simulation of SAW devices.

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Area of Science:

  • Electrical Engineering
  • Acoustics
  • Materials Science

Background:

  • Surface Acoustic Wave (SAW) devices are crucial for signal processing.
  • Accurate modeling of SAW grating filters, including losses, is essential for performance.
  • Existing design methods may not fully capture the complexities of SAW components.

Purpose of the Study:

  • To describe a systematic procedure for modeling, simulating, and designing SAW grating filters.
  • To incorporate signal losses into the design and analysis of SAW devices.
  • To develop a modular approach for analyzing complex SAW filter architectures.

Main Methods:

  • Utilized cascadable transmission-matrix building blocks to define grating structures and interdigital transducers (IDTs).
  • Employed chain-matrix multiplication to determine immittance characteristics of complex SAW filter architectures.
  • Developed a multipole filter design procedure based on lumped-element models for resonator building blocks.

Main Results:

  • A modular approach combining lossy filter synthesis with transmission-matrix descriptions for SAW components was established.
  • The range of validity for the lumped-element model approximation was examined.
  • Software for simulating SAW grating devices was developed and demonstrated with a resonator filter design example.

Conclusions:

  • The described matrix approach provides a systematic and modular method for designing SAW grating filters.
  • The developed software, integrated into a CAD/CAA package, facilitates efficient analysis and design of SAW filters.
  • This methodology enables accurate performance prediction and design optimization for SAW devices, considering signal losses.