Carry-Save-Type vs. Signed-Digit-Type Adder Circuits : Focus on Radix-2 and -4 Divider

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Bibliographic Information

Other Title
  • 桁上げ保存型 対 符号付き数型加算回路 : 基数2と4の除算器を中心に

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Description

There are two types of carry-propagation-free adder. One is a carry-save adder. The other is a signed-digit adder. In order to compare the difference of both types, we first consider radix-2 and -4 dividers using simpler adder circuits than multipliers'. We show that it is necessary for selecting quotient digits to refer to the same number of digits of the partial remainder and constructing the divider circuit with pass-transistor logic circuit which has the same circuit structure in AND, OR, EOR and select logic. (1) It is disadvantageous for the signed-digit type because the bottom propagation of positive and negative parts occur in the quotient-digit selection part. (2) It is disadvantageous for the carry-save type because the quotient-digit selection rude is somewhat asymmetric. Putting these facts together, we concluded that the carry-save type is more favorable in the circuit depth.

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Details 詳細情報について

  • CRID
    1570572702400456576
  • NII Article ID
    110003191519
  • NII Book ID
    AN10013152
  • Text Lang
    ja
  • Data Source
    • CiNii Articles

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