Design of SAW expander and compressor on LiTaO3 for a TCDMA spread spectrum system

L. Reindl, F. Kalabic, G. Ostermayer, A. Pohl, F. Seifert, R. Weigel

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


We report on the design and performance of SAW minimum-shift-keying (MSK) tapped delay lines (TDL's) using pseudonoise (PN) code sequences of length 128 chips. As a substrate, LiTaO3-X112°-rotY has been used due to the system requirements of a given CDMA/TDMA system (TCDMA). System IF frequency, bandwidth of the major lobe, and integration time were respectively 360 MHz, 63.5 MHz, and 3 μs. We used SAW TDL's employing non-weighted as well as cosine-apodized input transducers incorporating split-fingers. We designed both expander as well as compressor filters attaining very similar 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)821-824
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
Publication statusPublished - 1997
EventProceedings of the 1997 IEEE MTT-S International Microwave Symposium. Part 1 (of 3) - Denver, CO, USA
Duration: 8 Jun 199713 Jun 1997


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