본 논문에서는 MCNS(Multimedia Cable N$\xi$twork System)의 DOCSIS(Data Over Cable Service Interface S Specification) 표준안의 물리계층을 지원하는 비대칭형 기저대역 모댐 ASIC 칩의 아키텍쳐와 설계에 대해 기술한다. 구현한 모뎀 칩은 크게 QPSK/16-QAM 방식의 상향 스트림용 송신부와 64/256-QAM 방식의 하향 스트림용 수신부로 구성되어 있으며, 심볼 타이밍 복구회로, 반송파 복구회로. MMA(Multi Modulus Algorithm)와 LMS(Least Mean Square) 알고리즘을 적용한 결정 궤환 구조의 블라인드 등화기를 포함한다. 구현한 모뎀 칩은 64/256-QAM 변복조 방식에서 각각 48Mbps, 64Mbps의 데이터 전송률을 지원하고, 심볼 전송률은 기존의 QAM 수신기들보다 빠른 8MBaud를 갖는다. 구현한 칩은 $0.35\mu\textrm{m}$ 표준 셀(Standard Cell) 라이브러리를 사용하여 논리합성을 수행하였으며, 총 게이트 수는 약 29만 게이트이며, 현재 ASIC 칩으후 제작중이다.
KSP Keywords
16-ary quadrature amplitude modulation(16QAM), 256-QAM, Modulus Algorithm, Service Interface, Standard Cell, least-mean-square(LMS)
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