지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
In this paper, a wideband clock generator using novel Automatic frequency calibration(AFC) scheme is proposed. Wideband clock generator using AFC has the advantage of small VCO gain and wide frequency band. The conventional AFC compares whether the feedback frequency is faster or slower then the reference frequency. However, the proposed AFC can detect frequency difference between reference frequency with feedback frequency. So it can be reduced an operation time than conventional methods AFC. Conventional AFC goes to the initial code if the frequency step changed. This AFC, on the other hand, can a prior state code so it can approach a fast operation. In simulation results, the proposed clock generator is designed for DisplayPort using the CMOS ring-VCO. The VCO tuning range is 350㎒, and a VCO frequency is 270㎒. The lock time of clock generator is less then 3us at input reference frequency, 67.5㎒. The phase noise is -109dBC/Hz at 1MHz offset from the center frequency. and power consumption is 10.1㎽ at 1.8V supply and layout area is 0.384㎟.
목차
Abstract
1. 서론
2. 광대역 클록 발생기 구조
3. 개선된 AFC 회로
4. 시뮬레이션 및 고찰
5. 결론
참고문헌
저자소개
참고문헌 (6)
참고문헌 신청
김이섭 / 2009 / A spread spectrum clock generator with spread ratio error reduction scheme for DisplayPort main link / 2009 IEEE International Symposium on Circuits and Systems, ISCAS 2009 :185~188
2007 / VESA DisplayPort Standard Version 1.1
William B. Wilson / 2000 / A CMOS self-calibrating frequency synthesizer / IEEE J. Solid-State Circuits 35(10):1437~1444
김성근 / 2009 / DisplayPort용 TxPLL과 Spread Spectrum clock Generator의 설계 / 대한전자공학회 학술대회 :380~382
Han-il Lee / 2004 / A Σ-Δ fractional-N frequency synthesizer using a wide-band integrated VCO and a fast AFC technique for GSM/GPRS/WCDMA applications / Solid-State Circuits, IEEE Journal of 39(7):1164~1169
2007 / VESA DisplayPort Standard Version 1.1
William B. Wilson / 2000 / A CMOS self-calibrating frequency synthesizer / IEEE J. Solid-State Circuits 35(10):1437~1444
김성근 / 2009 / DisplayPort용 TxPLL과 Spread Spectrum clock Generator의 설계 / 대한전자공학회 학술대회 :380~382
Han-il Lee / 2004 / A Σ-Δ fractional-N frequency synthesizer using a wide-band integrated VCO and a fast AFC technique for GSM/GPRS/WCDMA applications / Solid-State Circuits, IEEE Journal of 39(7):1164~1169
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UCI(KEPA) : I410-ECN-0101-2012-560-004010095