Design and Comparison of the Fast-Hopping Frequency Synthesizers for MB-OFDM UWB Systems

MB-OFDM 방식의 UWB 시스템을 위한 Fast-Hopping 주파수 합성기의 유형별 설계 및 비교

  • Published : 2006.12.30


This paper describes fast-hewing frequency synthesizers for multi-band OFDM(MB-OFDM) ultra-wide band(UWB) systems. Three different structures in generating 3 center frequencies(3432MHz, 3960MHz, 4488MHz) are designed and compared. The first structure generates 3 center frequencies using only one PLL operating at 4224MHz, and the second uses three PLLs operating at corresponding center frequencies. The proposed third structure employes two PLLs operating at 3960MHz and 528MHz. Simulation results using 0.18um RF CMOS process parameters show that the third structure exhibits boner characteristics in spur, area and current consumption than the other structures. The band switching time of the proposed synthesizer is less than 1.In and the spur is less than -36dBc. The synthesizer consumes 22mA from a 1.8V supply.


  1. 이재경, 강기섭, 박종태, 유종근, 'MB-OFDM 방식의 UWB 시스템을 위한 CMOS 설계,' 한국해양정보통신학회논문지, 제10권 제1호, pp. 117-122, Jan. 2006
  2. Multi-band OFDM Physical Layer Proposal' IEEE P802.15 Working Group for Wireless Personal Area Networks(WPANs), TG3a-Multi-band-OFDM-CFP-Presen tation.ppt
  3. 'XtremeSpectrum CFP Presentation' IEEE P802.15 Working Group for Wireless Persona Area Networks (WPANs), XtremeSpectrum-CFP-Presentation.ppt
  4. 이재경, 유종근, 'MB-OFDM UWB 시스템을 위한 Fast-Hopping 주파수 합성기 설계', 대한전자공학회 SoC 컨퍼런스 논문지, May. 2006
  5. Behzad Razavi, 'A UWB CMOS Transceiver', IEEE J. Solid-State Circuits, vol. 40. No. 12, December 2005
  6. John G. Maneatis, 'Low-jitter Process-Independent DLL and PLL Based on Self-Biased Techniques', IEEE J. Solid-State Circuits, vol. 31. No. 11. November 1996
  7. T. P. Liu, 'A 2.7-V dual-frequency single-sidebnad mixer', in Symp. VLSI Circuits Dig. Tech. Papers, pp. 124-127 Jun. 1998
  8. 이재경, 유종근, '초광대역 시스템 Hopping Carrier 발생을 위한 0.18um 4.224GHz CMOSPLL 설계', 대한전자공학회 추계학술대회 논문지 II, pp. 845-848, 2005