Design of SAW Expander and Compressor on LiTaO3 for a TCDMA Spread Spectrum System

Robert Weigel; Faris Kalabic; Gerald Ostermayer; Alfred Pohl; Franz Seifert; Leonhard Reindl

doi:10.1109/22.643864

Design of SAW Expander and Compressor on LiTaO3 for a TCDMA Spread Spectrum System

Robert Weigel, Faris Kalabic, Gerald Ostermayer, Alfred Pohl, Franz Seifert, Leonhard Reindl

Research Center Hagenberg

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We report on the design and performance of surfaceacoustic wave (SAW) minimum shift keying (MSK) tapped delay lines using pseudonoise code sequences with a length of 128 chips. As a substrate, X112°rotY-LiTaO3 has been used due to the system requirements of a given CDMA/TDMA (TCDMA) radio communication system. System IF frequency, bandwidth of the major lobe, and integration time of the SAW devices were, respectively, 360 MHz, 63.5 MHz, and 3 fis. We used SAW tapped delay lines employing nonweighted as well as cosine-weighted input interdigital transducers incorporating split-fingers. We designed both expander as well as compressor filters attaining very similar experimental results. We found insertion loss values down to 16 dB and amplitude ripples of less than 2 dB. The close-in selectivity was 28 dB.

Original language	English
Pages (from-to)	2486-2492
Number of pages	7
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	45
Issue number	12 PART 2
DOIs	https://doi.org/10.1109/22.643864
Publication status	Published - Dec 1997

Keywords

Spread spectrum communication
Surfaceacoustic waves
TCDMA
Tapped delay lines

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10.1109/22.643864

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abstract = "We report on the design and performance of surfaceacoustic wave (SAW) minimum shift keying (MSK) tapped delay lines using pseudonoise code sequences with a length of 128 chips. As a substrate, X112°rotY-LiTaO3 has been used due to the system requirements of a given CDMA/TDMA (TCDMA) radio communication system. System IF frequency, bandwidth of the major lobe, and integration time of the SAW devices were, respectively, 360 MHz, 63.5 MHz, and 3 fis. We used SAW tapped delay lines employing nonweighted as well as cosine-weighted input interdigital transducers incorporating split-fingers. We designed both expander as well as compressor filters attaining very similar experimental results. We found insertion loss values down to 16 dB and amplitude ripples of less than 2 dB. The close-in selectivity was 28 dB.",

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author = "Robert Weigel and Faris Kalabic and Gerald Ostermayer and Alfred Pohl and Franz Seifert and Leonhard Reindl",

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AU - Kalabic, Faris

AU - Ostermayer, Gerald

AU - Pohl, Alfred

AU - Seifert, Franz

AU - Reindl, Leonhard

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Design of SAW Expander and Compressor on LiTaO3 for a TCDMA Spread Spectrum System

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