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 output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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 languageEnglish
Pages (from-to)2486-2492
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12 PART 2
Publication statusPublished - Dec 1997


  • Spread spectrum communication
  • Surfaceacoustic waves
  • Tapped delay lines


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