{"title":"一种利用大量电子开关可选晶体的低噪声多频振荡器","authors":"M. Driscoll, N. Matthews","doi":"10.1109/FREQ.1989.68838","DOIUrl":null,"url":null,"abstract":"The design and performance are reported of an oscillator incorporating 16 PIN diode switch-selectable, fifth-overtone crystals operating in the 100-MHz range. A lumped-element, quarter-wavelength line provides a means for absorption of the printed wiring board track connections and switch parasitic reactances for the 15 switched-off crystals. PIN (rather than Schottky) diodes were utilized because they have lower off-state capacitance and PIN diode use has no measurable degrading influence on oscillator signal phase noise performance. Oscillator flicker of frequency noise is characterized by Sy(100 Hz)=3*10/sup -25/ and is due to short-term instability in the resonators themselves. The pulse noise floor level is -169 dB/Hz. Using modest levels of excess gain, interchannel frequency switching time is on the order of 2 ms, compared to 9-ms turn-on time.<<ETX>>","PeriodicalId":294361,"journal":{"name":"Proceedings of the 43rd Annual Symposium on Frequency Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1989-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A low-noise, multiple-frequency oscillator utilizing large numbers of electronic switch-selectable crystals\",\"authors\":\"M. Driscoll, N. Matthews\",\"doi\":\"10.1109/FREQ.1989.68838\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The design and performance are reported of an oscillator incorporating 16 PIN diode switch-selectable, fifth-overtone crystals operating in the 100-MHz range. A lumped-element, quarter-wavelength line provides a means for absorption of the printed wiring board track connections and switch parasitic reactances for the 15 switched-off crystals. PIN (rather than Schottky) diodes were utilized because they have lower off-state capacitance and PIN diode use has no measurable degrading influence on oscillator signal phase noise performance. Oscillator flicker of frequency noise is characterized by Sy(100 Hz)=3*10/sup -25/ and is due to short-term instability in the resonators themselves. The pulse noise floor level is -169 dB/Hz. Using modest levels of excess gain, interchannel frequency switching time is on the order of 2 ms, compared to 9-ms turn-on time.<<ETX>>\",\"PeriodicalId\":294361,\"journal\":{\"name\":\"Proceedings of the 43rd Annual Symposium on Frequency Control\",\"volume\":\"1 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1989-05-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the 43rd Annual Symposium on Frequency Control\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/FREQ.1989.68838\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the 43rd Annual Symposium on Frequency Control","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/FREQ.1989.68838","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A low-noise, multiple-frequency oscillator utilizing large numbers of electronic switch-selectable crystals
The design and performance are reported of an oscillator incorporating 16 PIN diode switch-selectable, fifth-overtone crystals operating in the 100-MHz range. A lumped-element, quarter-wavelength line provides a means for absorption of the printed wiring board track connections and switch parasitic reactances for the 15 switched-off crystals. PIN (rather than Schottky) diodes were utilized because they have lower off-state capacitance and PIN diode use has no measurable degrading influence on oscillator signal phase noise performance. Oscillator flicker of frequency noise is characterized by Sy(100 Hz)=3*10/sup -25/ and is due to short-term instability in the resonators themselves. The pulse noise floor level is -169 dB/Hz. Using modest levels of excess gain, interchannel frequency switching time is on the order of 2 ms, compared to 9-ms turn-on time.<>
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