The Story of Unified Cordic

  • John Stephen Walther


The story is told of how the Unified Cordic algorithm came to be developed, starting from an idea in the mind of a student and culminating in a product, a patent, a paper, a motorcade, and an award. Along the way, a unified algorithm for generating the elementary functions and the math co-processor industry in Silicon Valley were born.


Computer Arithmetic CORDIC Algorithm Information Processing Society Incremental Rotation Hardware Logic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    J.E. Meggitt, “Pseudo Division and Pseudo Multiplication Processes,” IBM Journal, April 1962, pp. 210–226.Google Scholar
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    J.E. Volder, “The CORDIC Trigonometric Computing Technique,” IRE Transactions on Electronic Computers, vol. EC-8, no.3, pp. 330–334.Google Scholar
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    M.A. Liccardo, “An Interconnect Processor with Emphasis on CORDIC Mode,” Masters Thesis, EE Dept., University of California at Berkeley, September 1968.Google Scholar
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    D.S. Cochran, “Algorithms and Accuracy in the HP-35,” Hewlett-Packard Journal, vol 23, no.10, 1972, pp. 10–11.Google Scholar
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    J.S. Walther, US patent 3766370: Elementary Floating Point CORDIC Function Processor and Shifter, filing date May 14, 1971, issue date Oct 16, 1973.Google Scholar
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    J.S. Walther, “A Unified Algorithm for Elementary Functions,” Conference Proceedings, Spring Joint Computer Conference, May 1971, pp. 379–385.Google Scholar
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    J.S. Walther, “A Unified Algorithm for Elementary Functions,” in The Best Comuter Papers in 1971, Orlando R. Petrocelli (Ed.), Auerbach Publishers 1972, pp. 69–81.Google Scholar
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    K. Hwang, Computer Arithmetic Principles: Architecture and Design. New York: Wiley, 1979.Google Scholar

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • John Stephen Walther
    • 1
  1. 1.Design Technology Center of the Integrated Circuit Business Division of Agilent Technologies, Inc.USA

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