Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Design of a Wide-Band CMOS VCO With Reduced Variations of VCO Gain and Frequency Steps for DTV Tuner Applications

VCO 이득 변화와 주파수 간격 변화를 줄인 DTV용 광대역 CMOS VCO 설계

  • Ko, S.O. (Dept. of Electronics Engineering, University of Incheon) ;
  • Sim, S.M. (Dept. of Electronics Engineering, University of Incheon) ;
  • Sho, H.T. (Dept. of Electronics Engineering, University of Incheon) ;
  • Kim, C.K. (Dept. of Computer Engineering, University of Incheon) ;
  • Yu, C.G. (Dept. of Electronics Engineering, University of Incheon)
  • 고승오 (인천대학교 전자공학과) ;
  • 심상미 (인천대학교 전자공학과) ;
  • 서희택 (인천대학교 전자공학과) ;
  • 김정규 (인천대학교 컴퓨터공학과) ;
  • 유종근 (인천대학교 전자공학과)
  • Published : 2008.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

Since the digital TV signal band is very wide ($54{\sim}806MHz$), the VCO used in the frequency synthesizer must also have a wide frequency tuning range. Multiple LC VCOs have been used to cover such wide frequency band. However, the chip area increases due to the increased number of integrated inductors. A general method for achieving both reduced VCO gain(Kvco) and wide frequency band is to use the switched-capacitor bank LC VCO. In this paper, a scheme is proposed to cover the full band using only one VCO. The RF VCO block designed using a 0.18um CMOS process consists of a wideband LC VCO with reduced variation of VCO gain and frequency steps. Buffers, divide-by-2 circuits and control logics the simulation results show that the designed circuit has a phase noise at 100kHz better than -106dBc/Hz throughout the signal band and consumes $9.5{\sim}13mA$ from a 1.8V supply.

Keywords