Comparison of Single Bit 14T and 8T Full Adder for Low-Power VLSI Design
نویسندگان
چکیده
This paper presents a new design for 14 transistor single bit full adder, implemented using five transistor XNOR/XOR cell and transmission gate multiplexer. For transmission gate multiplexer complementary gate control signals are required and in 14 transistor full Adder both XOR and XNOR signals are generated. XNOR/XOR cell shows high power consumption than single XNOR gate. So, 8 transistor full adder has been designed using 3 transistor XNOR gate and comparison is made between 14 T and 8 T full adder. Simulation has been done using 0.35μm technology. These circuits were redesigned at the transistor-level in tsmc 0.18μm technology and comparison reported here uses Mentor Graphics ELDO simulations to assess their performance. Circuit works well with reduced supply voltage and simulations have been carried out up to 1.8V supply voltage. 8T full adder shows better performance in terms of power consumption and transistor count as compared to 14 T full adder.
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