Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Design of a UHF-Band CMOS Fractional-N Frequency Synthesizer Using a Ring-Type VCO

Ring VCO를 사용한 UHF 대역 CMOS Fractional-N 주파수합성기 설계

  • Chu, H.S. (Dept. of Electronics Engineering, university of Incheon) ;
  • Seo, H.T. (Dept. of Electronics Engineering, university of Incheon) ;
  • Park, S.J. (Dept. of Electronics Engineering, university of Incheon) ;
  • Kim, K.H. (Dept. of Electronics Engineering, university of Incheon) ;
  • Kang, H.C. (Dept. of Information and Telecom. Engineering, university of Incheon) ;
  • Yu, C.G. (Dept. of Electronics Engineering, university of Incheon)
  • 추홍성 (인천대학교 전자공학과) ;
  • 서희택 (인천대학교 전자공학과) ;
  • 박상재 (인천대학교 전자공학과) ;
  • 김경환 (인천대학교 전자공학과) ;
  • 강현철 (인천대학교 정보통신공학과) ;
  • 유종근 (인천대학교 전자공학과)
  • Published : 2008.10.31
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Abstract

In this paper, we describe a UHF-band CMOS fractional-N frequency synthesizer using a ring - type VCO. It has been designed using $0.18{\m}m$ CMOS technology. First, The newly designed charge-pump circuit includes an OTA for matching between the upper current and the lower current In addition, a ring - type VCO is also used for small chip sire. The simulation results show that the designed circuit has a phase noise of -109.53dBc/Hz at 1MHz offset and consumes 19.4mA from a 1.8V supply. The lock time is less than 30usec and the chip size is $0.45mm{\times}0.5mm$.

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