{"title":"一个32分路数字控制可编程横向滤波器","authors":"C.M. Panasik, W.R. Paxman, J. Culver","doi":"10.1109/ULTSYM.1988.49359","DOIUrl":null,"url":null,"abstract":"A digitally controlled programmable transversal filter (DCPTF) has been developed that uses a 32-tap LiNbO/sub 3/ delay line and two LSI GaAs ICs to digitally control tap weight magnitude and sign. Compared to previously reported PTR devices, this third-generation device is significantly reduced in size and power, yet retains state-of-the-art performance. The device is completely programmable, constrained only by the bandwidth (100 MHz centered at 100 MHz) and the number of taps. The DCPTF is designed in 16-tap blocks to easily expand the number of taps. A calibration method is presented which removes nonideal GaAs FET (field-effect transistor) array gain states due to process variations. The on/off ratio of each individual tap is greater than 35 dB. The DCPTF is demonstrated as a bandpass filter with programmable center frequency and bandwidth.<<ETX>>","PeriodicalId":263198,"journal":{"name":"IEEE 1988 Ultrasonics Symposium Proceedings.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"9","resultStr":"{\"title\":\"A 32 tap digitally controlled programmable transversal filter\",\"authors\":\"C.M. Panasik, W.R. Paxman, J. Culver\",\"doi\":\"10.1109/ULTSYM.1988.49359\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A digitally controlled programmable transversal filter (DCPTF) has been developed that uses a 32-tap LiNbO/sub 3/ delay line and two LSI GaAs ICs to digitally control tap weight magnitude and sign. Compared to previously reported PTR devices, this third-generation device is significantly reduced in size and power, yet retains state-of-the-art performance. The device is completely programmable, constrained only by the bandwidth (100 MHz centered at 100 MHz) and the number of taps. The DCPTF is designed in 16-tap blocks to easily expand the number of taps. A calibration method is presented which removes nonideal GaAs FET (field-effect transistor) array gain states due to process variations. The on/off ratio of each individual tap is greater than 35 dB. The DCPTF is demonstrated as a bandpass filter with programmable center frequency and bandwidth.<<ETX>>\",\"PeriodicalId\":263198,\"journal\":{\"name\":\"IEEE 1988 Ultrasonics Symposium Proceedings.\",\"volume\":\"2 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1988-10-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"9\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE 1988 Ultrasonics Symposium Proceedings.\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/ULTSYM.1988.49359\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE 1988 Ultrasonics Symposium Proceedings.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ULTSYM.1988.49359","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A 32 tap digitally controlled programmable transversal filter
A digitally controlled programmable transversal filter (DCPTF) has been developed that uses a 32-tap LiNbO/sub 3/ delay line and two LSI GaAs ICs to digitally control tap weight magnitude and sign. Compared to previously reported PTR devices, this third-generation device is significantly reduced in size and power, yet retains state-of-the-art performance. The device is completely programmable, constrained only by the bandwidth (100 MHz centered at 100 MHz) and the number of taps. The DCPTF is designed in 16-tap blocks to easily expand the number of taps. A calibration method is presented which removes nonideal GaAs FET (field-effect transistor) array gain states due to process variations. The on/off ratio of each individual tap is greater than 35 dB. The DCPTF is demonstrated as a bandpass filter with programmable center frequency and bandwidth.<>
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