Adder Design Methodologies and Limitations Using CMOS Circuits : Study and Review
Keywords:
CMOS, Adders, VLSI Design, CAD, process technology, delay analysisAbstract
In this review paper different design techniques of multi bit adder are deliberate using linear parameters logic gates. The comparison is carried by several parameter mainly focus on a number of linear threshold gates, a number of CMOS transistor, power dissipation, power delay product (PDP), average power dissipation time delay and size of the full adder circuit. Adder circuits basically implemented using basic logic gates namely XOR and AND gates. Half Adders or Full adders may be realized in various ways depending on the various process technologies and design methodologies deployed for making these digital integrated circuits design. The Full adder, 14T, pseudo-nMOS, MULTIPLEXER-BASED FULL ADDER , 8T, Inverter-based full-adder with pass transistors, Conventional CMOS (C-CMOS), 20T,10Twith 4T-XNOR, 6T, 16T, 9T, Double gate MOSFET and hybrid 1-bit full adder full adders etc
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