{"title":"宽带DS-CDMA系统中用于高数据速率msk编码的SAW整形滤波器","authors":"A. Zenzinger, F. Morhart, L. Reindl, R. Weigel","doi":"10.1109/MTTTWA.1997.595128","DOIUrl":null,"url":null,"abstract":"We report on two surface acoustic wave (SAW) shaping filters which generate a minimum shift keying (MSK) modulated signal by converting a BPSK modulated signal. The filters are intended to be used for modulators with high data rates, as it is necessary in broadband direct sequence code division multiple access (DS-CDMA) systems. One filter has been fabricated from a lithium tantalate (LiTaO/sub 3/) substrate, and one from a quartz substrate. The filter on LiTaO/sub 3/ fulfills all requirements dealing with spectrum shaping. However, the temperature range is not as wide as with quartz substrates due to the higher temperature coefficient of LiTaO/sub 3/. The filter on quartz is very stable from the temperature coefficient point of view, but the insertion attenuation and spurious electromagnetic feedthrough are relatively high.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"A SAW shaping filter for high data rate MSK-encoding in a broadband DS-CDMA system\",\"authors\":\"A. Zenzinger, F. Morhart, L. Reindl, R. Weigel\",\"doi\":\"10.1109/MTTTWA.1997.595128\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report on two surface acoustic wave (SAW) shaping filters which generate a minimum shift keying (MSK) modulated signal by converting a BPSK modulated signal. The filters are intended to be used for modulators with high data rates, as it is necessary in broadband direct sequence code division multiple access (DS-CDMA) systems. One filter has been fabricated from a lithium tantalate (LiTaO/sub 3/) substrate, and one from a quartz substrate. The filter on LiTaO/sub 3/ fulfills all requirements dealing with spectrum shaping. However, the temperature range is not as wide as with quartz substrates due to the higher temperature coefficient of LiTaO/sub 3/. The filter on quartz is very stable from the temperature coefficient point of view, but the insertion attenuation and spurious electromagnetic feedthrough are relatively high.\",\"PeriodicalId\":264044,\"journal\":{\"name\":\"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest\",\"volume\":\"1 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1997-02-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/MTTTWA.1997.595128\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MTTTWA.1997.595128","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A SAW shaping filter for high data rate MSK-encoding in a broadband DS-CDMA system
We report on two surface acoustic wave (SAW) shaping filters which generate a minimum shift keying (MSK) modulated signal by converting a BPSK modulated signal. The filters are intended to be used for modulators with high data rates, as it is necessary in broadband direct sequence code division multiple access (DS-CDMA) systems. One filter has been fabricated from a lithium tantalate (LiTaO/sub 3/) substrate, and one from a quartz substrate. The filter on LiTaO/sub 3/ fulfills all requirements dealing with spectrum shaping. However, the temperature range is not as wide as with quartz substrates due to the higher temperature coefficient of LiTaO/sub 3/. The filter on quartz is very stable from the temperature coefficient point of view, but the insertion attenuation and spurious electromagnetic feedthrough are relatively high.
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