Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Max-based Analog Absolute Circuits with Small Error

작은 에러를 갖는 Max 회로 기반 아날로그 절대값 계산 회로

  • Prasad sah, Maheshwar (Div. of Electronics and Information Eng., Chonbuk National University) ;
  • Lin, Hai-Ping (Div. of Electronics and Information Eng., Chonbuk National University) ;
  • Yang, Chang-Ju (Div. of Electronics and Information Eng., Chonbuk National University) ;
  • Lee, Jun-Ho (Dept. of Mechtronics, Graduate School, Chonbuk National University) ;
  • Kim, Hyong-Suk (Div. of Electronics and Information Eng., Chonbuk National University)
  • Published : 2009.02.28
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Abstract

Error is the major problem in communication system. Absolute circuit is one of the most important building blocks to implement for the error measurement in communication system as well as in analog circuit design. The main goal of this paper is to design a circuit with high accuracy and minimum error performance. In this paper, a new current mode absolute circuit is implemented to calculate the absolute value of two signals. This new design shows enhanced performance and low distortion over the previous implementation. The proposed circuit is simulated using Hspice and implemented in analog viterbi decoder. It is very suitable for implementing in error calculation for the large scale integrated circuit. Hspice simulation results of previous and new one circuit are reported.

통신시스템에서의 에러의 처리는 매우 중요한 문제로서 비터비 디코더와 같은 에러처리를 위해서 주로 절대값으로 표현하기 때문에 아날로그 절대값 회로가 자주 필요하게 된다. 이 논문에서는 절대값을 정확하게 계산할 수 있는 아날로그 절대값 회로를 제안하였다. 제안한 절대값 회로에는 부호가 반대인 두 신호들을 만든 다음, 이 신호들을 아날로그MAX회로에 인가하여 둘 중 최대값을 출력하게 하는 방법이다. 이 구조를 회로로 구현하기 위해서는 두 개의 입력 신호를 반대방향으로 차를 구하여, 크기는 같고 부호가 다른 두 개의 신호를 만든 다음 이들을 MAX회로의 입력으로 사용하는 회로를 설계하였다. 본 논문에서는 제안한 회로를 Hspice를 이용하여 시뮬레이션을 수행했으며, 그 결과를 제시하였다.

Keywords

References

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