{"title":"MOS lc - vco中有源器件的AM-FM转换及其对最优振幅的影响","authors":"B. Soltanian, P. Kinget","doi":"10.1109/RFIC.2006.1651102","DOIUrl":null,"url":null,"abstract":"Large oscillation amplitudes in differential MOS LC-VCOs change the operation region of the MOS negative-resistance devices and thus modulate their parasitic capacitances. As a result, the effective tank capacitance and the oscillation frequency change with respect to the oscillation amplitude for a fixed tuning voltage. The resulting frequency-versus-amplitude curve has a maximum for differential amplitude approximately equal to the threshold voltage of the MOS devices which corresponds to the optimum amplitude that minimizes AM-to-FM conversion. The presented analysis is confirmed with simulation and measurement results for a 2 GHz differential NMOS VCO fabricated in a 0.25 mum BiCMOS process. The optimum amplitude for lowest AM-to-FM conversion also yields the lowest phase noise for this oscillator","PeriodicalId":194071,"journal":{"name":"IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2006","volume":"39 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2006-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"34","resultStr":"{\"title\":\"AM-FM conversion by the active devices in MOS LC-VCOs and its effect on the optimal amplitude\",\"authors\":\"B. Soltanian, P. Kinget\",\"doi\":\"10.1109/RFIC.2006.1651102\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Large oscillation amplitudes in differential MOS LC-VCOs change the operation region of the MOS negative-resistance devices and thus modulate their parasitic capacitances. As a result, the effective tank capacitance and the oscillation frequency change with respect to the oscillation amplitude for a fixed tuning voltage. The resulting frequency-versus-amplitude curve has a maximum for differential amplitude approximately equal to the threshold voltage of the MOS devices which corresponds to the optimum amplitude that minimizes AM-to-FM conversion. The presented analysis is confirmed with simulation and measurement results for a 2 GHz differential NMOS VCO fabricated in a 0.25 mum BiCMOS process. The optimum amplitude for lowest AM-to-FM conversion also yields the lowest phase noise for this oscillator\",\"PeriodicalId\":194071,\"journal\":{\"name\":\"IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2006\",\"volume\":\"39 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2006-06-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"34\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2006\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/RFIC.2006.1651102\",\"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 Radio Frequency Integrated Circuits (RFIC) Symposium, 2006","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/RFIC.2006.1651102","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 34
摘要
差分MOS lc - vco中的大振荡幅度改变了MOS负阻器件的工作区域，从而调制了其寄生电容。因此，在固定的调谐电压下，有效槽电容和振荡频率相对于振荡幅度而变化。所得到的频率-振幅曲线的差分振幅最大值近似等于MOS器件的阈值电压，该阈值电压对应于使调幅-调频转换最小化的最佳振幅。采用0.25 μ m BiCMOS工艺制作的2 GHz差分NMOS压控振荡器的仿真和测量结果证实了上述分析的正确性。最低调幅调频转换的最佳幅度也为该振荡器产生最低的相位噪声
AM-FM conversion by the active devices in MOS LC-VCOs and its effect on the optimal amplitude
Large oscillation amplitudes in differential MOS LC-VCOs change the operation region of the MOS negative-resistance devices and thus modulate their parasitic capacitances. As a result, the effective tank capacitance and the oscillation frequency change with respect to the oscillation amplitude for a fixed tuning voltage. The resulting frequency-versus-amplitude curve has a maximum for differential amplitude approximately equal to the threshold voltage of the MOS devices which corresponds to the optimum amplitude that minimizes AM-to-FM conversion. The presented analysis is confirmed with simulation and measurement results for a 2 GHz differential NMOS VCO fabricated in a 0.25 mum BiCMOS process. The optimum amplitude for lowest AM-to-FM conversion also yields the lowest phase noise for this oscillator
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