The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Study on the N-Path SC Tracking Filter using PLL

PLL을 이용한 N-Path SC추적여파기에 관한 연구

  • Jung, Sung-Hwan (Korea Institute of Electronics Technology) ;
  • Son, Hyun (Dept. of Electronic Eng., Kyungbuk National University)
  • 정성환 (한국전자기술연구소) ;
  • 손현 (경북대학교공과대학전자공학과)
  • Published : 1983.10.01
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Abstract

N-path SC tracking filter is studied beyond the audio frequency range. First, the SC filter Cell which would determine total SC filter characteristics is analyzed by the two methods, charge equation method and difference equation method. Second, 4-path and 8-path SC filter are presented, including only capacitors and switches. Then, 4-path and 8-path SC tracking filter are constructed by conisting of SC filter block and PLL block. In this experiment, maximum response shift is confirmed. With respect to the capacitor ratios and the number of path, Q and Gain(dB) is considered. Also tracking range is measured.

N-Path SC追跡濾波器를 可聽周波數이상에서 硏究하였다. 먼저 전체 SC濾波器의 特性을 決定지우는 Filter Cell에 대한 解析으로 電荷方程式과 差等方程式에 의한 解析을 수행하고 커패시터와 스위치만으로 構成된 4-path와 8-path SC濾波器를 提示하였다. 다음 실제로 SC濾波器블록과 PLL블록의 構成으로 4-path와 8-path SC追跡濾波器를 각각 構成하였으며 最大應答의 移動, 커패시터比와 path數에 따른 Q와 利得(dB)의 變動, 追跡範圍등을 考察하였다.

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