대한전자공학회논문지SD (Journal of the Institute of Electronics Engineers of Korea SD)

대한전자공학회 (The Institute of Electronics and Information Engineers)
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WCDMA용 67-dB DR, 1.2-V, $0.18-{\mu}m$ 시그마-델타 모듈레이터 설계

A 67dB DR, 1.2-V, $0.18-{\mu}m$ Sigma-Delta Modulator for WCDMA Application

  • 발행 : 2007.06.25
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초록

[ $0.18-{\mu}m$ ] CMOS 공정에서 1.2-V 2차 Full-Feedforward 구조의 ${\Sigma}{\Delta}$ 모듈레이터를 설계하였다. Full-Feedforward 구조는 Op-Amp의 성능 요구치를 크게 경감시키기 때문에 저전압 저전력 ${\Sigma}{\Delta}$ 모듈레이터를 만들기에 적합한 구조로 세계적으로 많이 채택되고 있는 추세이다. 그리고, Top-Down 설계 기법을 적용하여 ${\Sigma}{\Delta}$ 모듈레이터를 설계하였는데, 이를 위하여 Op-Amp의 유한한 DC-Gain과 Bandwidth 등 여러 가지 비이상적 효과들을 모델링하여 전달함수를 유도하였다.

[ $0.18-{\mu}m$ ] CMOS 1.2-V 2nd-order ${\Sigma}{\Delta}$ modulator with full-feedforward topology is designed. Using full-feedforward topology makes op-amp performance requirements much less stringent, therefore it has been adopted as a good candidate for low-voltage low-power applications throughout the world. Also, ${\Sigma}{\Delta}$ modulator is designed with top-down design approach, therefore various nonideal effects of op-amp are modeled in this paper.

키워드

참고문헌

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