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Related Experiment Video

Updated: Jul 7, 2026

Quasi-light Storage for Optical Data Packets
07:45

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Published on: February 6, 2014

Direct sequence spread spectrum differential phase shift keying SAW correlator on GaAs.

F Moeller1, J Enderlein, M A Belkerdid

  • 1RF Monolithics, Dallas, TX.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 2, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces an in-line correlator for differential phase shift keying (DPSK) systems, enabling noncoherent demodulation in spread spectrum applications. The novel design on Gallium Arsenide (GaAs) offers improved performance and integration capabilities for surface acoustic wave (SAW) devices.

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Last Updated: Jul 7, 2026

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Signal Processing

Background:

  • Surface Acoustic Wave (SAW) devices are crucial for signal processing in wireless communication.
  • Gallium Arsenide (GaAs) offers unique piezoelectric properties for integrating SAW devices with electronics.
  • Differential Phase Shift Keying (DPSK) enables noncoherent data demodulation, simplifying receiver design.

Purpose of the Study:

  • To design, fabricate, and experimentally validate a novel single SAW-based correlator for DPSK modulation.
  • To demonstrate the advantages of an in-line correlator structure over traditional parallel designs for spread spectrum applications.
  • To explore the integration of SAW correlators with electronics on a GaAs substrate.

Main Methods:

  • Fabrication of a DPSK correlator on a {100} cut GaAs substrate with SAW propagation in the 110 direction.
  • Implementation of an in-line correlator structure, inherently providing a one-bit delay.
  • Experimental characterization in both time and frequency domains to assess performance.

Main Results:

  • The in-line SAW correlator structure demonstrated advantages including inherent one-bit delay, reduced insertion loss, and less signal distortion.
  • Experimental results for the GaAs-based SAW correlator closely matched theoretical predictions.
  • The device functioned effectively as a despreader in a DPSK system.

Conclusions:

  • The developed in-line DPSK SAW correlator on GaAs is a viable and high-performance solution for direct sequence spread spectrum applications.
  • The use of GaAs enables enhanced system integration, leading to smaller, lower-cost, and more efficient electronic systems.
  • The study validates the potential of integrated SAW devices on piezoelectric semiconductors for advanced communication systems.