K. Takano, R. Dong, Sangyeop Lee, S. Amakawa, T. Yoshida, M. Fujishima
{"title":"A 239-315 GHz CMOS Frequency Doubler Designed by Using a Small-Signal Harmonic Model","authors":"K. Takano, R. Dong, Sangyeop Lee, S. Amakawa, T. Yoshida, M. Fujishima","doi":"10.23919/EUMIC.2018.8539957","DOIUrl":null,"url":null,"abstract":"In order to realize a wideband frequency multiplier at terahertz frequencies, iterative optimization of circuit parameters is necessary. However, iterative execution of nonlinear simulation takes a prohibitively long time. We present a small-signal harmonic model, which is equivalent to using only the dominant components of a full set of X-parameters, to solve the problem. It is a simple but accurate nonlinear model suitable for obtaining the frequency response. A 300-GHz frequency doubler with an eight-stage driver amplifier is designed by using the technique. The frequency doubler is fabricated using a 40-nm CMOS process. It achieves a 3-dB bandwidth of 76 GHz from 239 to 315 GHz and a maximum output power of −10 dBm.","PeriodicalId":248339,"journal":{"name":"2018 13th European Microwave Integrated Circuits Conference (EuMIC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2018 13th European Microwave Integrated Circuits Conference (EuMIC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.23919/EUMIC.2018.8539957","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
In order to realize a wideband frequency multiplier at terahertz frequencies, iterative optimization of circuit parameters is necessary. However, iterative execution of nonlinear simulation takes a prohibitively long time. We present a small-signal harmonic model, which is equivalent to using only the dominant components of a full set of X-parameters, to solve the problem. It is a simple but accurate nonlinear model suitable for obtaining the frequency response. A 300-GHz frequency doubler with an eight-stage driver amplifier is designed by using the technique. The frequency doubler is fabricated using a 40-nm CMOS process. It achieves a 3-dB bandwidth of 76 GHz from 239 to 315 GHz and a maximum output power of −10 dBm.