Asian Journal of Scientific Research 1992-1454 2077-2076 Asian Network for Scientific Information 10.3923/ajsr.2015.478.489 Elamaran V. Upadhyay Har Narayan 4 2015 8 4 Since the performance of portable electronic products increases continuously with demand, there is a need for low power digital VLSI design. Due to limited backup time of batteries, the operating time of portable electronic products is highly restricted. So, the designers now concentrate on low power rather than the speed of the device or system. We implement a 4 bit barrel shifter using different flavors like conventional CMOS logic, pass transistor logic and transmission gate logic styles. Electronic Computer Aided Design (CAD) tools like Microwind and a DSCH are used in our simulations by which the comparison of power in each style is provided. Microwind is used a layout editor and DSCH (Digital Schematic) is used as a schematic editor. Results show that the pass transistor logic consumes less power with minimum area and good performance. We used BSIM4 MOSFET model in 0.12 μm for experimental results. To improve the reliability of the circuits, fault tolerant voter circuits are implemented. The results are compared with the existing approaches and the proposed methods.

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