{"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}
引用次数: 0
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.<>
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