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[Keyword] carry propagation free(1hit)

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  • Carry Propagation Free Adder/Subtracter Using Adiabatic Dynamic CMOS Logic Circuit Technology

    Yasuhiro TAKAHASHI  Kei-ichi KONTA  Kazukiyo TAKAHASHI  Michio YOKOYAMA  Kazuhiro SHOUNO  Mitsuru MIZUNUMA  

     
    PAPER

      Vol:
    E86-A No:6
      Page(s):
    1437-1444

    This paper describes a design of a Carry Propagation Free Adder/Subtracter (CPFA/S) VLSI using the Adiabatic Dynamic CMOS Logic (ADCL) circuit technology. Using a PSPICE simulator, energy dissipation of the ADCL 1 bit CPFA/S is compared with that of the CMOS 1 bit CPFA/S. As a result, energy dissipation of the proposed ADCL circuits is about 1/3 as high as that of the CMOS circuits. The transistors count, propagation-delay time and energy dissipation of the ADCL 4 bit CPFA/S are compared with those of the ADCL 4 bit Ripple Carry Adder/Subtracter (RCA/S). The transistors count and propagation-delay time are found to be reduced by 7.02% and 57.1%, respectively. Also, energy dissipation is found to be reduced by 78.4%. Circuit operation and performance are evaluated using a chain of the ADCL 1 bit CPFA/S fabricated in a 1.2 µm CMOS process. The experimental results show that addition and subtraction are operated with clock frequencies up to about 1 MHz. In addition, the total power dissipation of the ADCL 1 bit CPFA/S is 28.7 µW including the power supply.