ISSN 1002-1027  CN 11-2952/G2

Acta scientiarum naturalium Universitatis Pekinensis

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An Improvement on Carry Chain of Conditional Carry Selection

WU Ke1, GAN Xuewen, ZHAO Baoying   

  1. Institute of Microelectronics, School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871; 1E-mail: wuke@ime.pku.edu.cn
  • Received:2005-03-02 Online:2006-05-20 Published:2006-05-20

Abstract: An improved conditional carry selection (CCS) circuit is proposed in this paper. The new circuit is compared with the conventional conditional carry selection structure for a 4-bit adder. The two circuits were simulated by SPICE under the same condition and the results show that the propagation time of carry and sum (C3 and S3)of 4-bit adder are reduced 34.39% and 33.95%, respectively.