Comparative Study on Low Power Barrel Shifter/Rotator at 45nm Technology
Jyoti Sankar Sahoo1, Nirmal Kumar Rout2
1Mr. Jyoti Sankar Sahoo, Electronics and Communication Engineering, KIIT University, Bhubaneswar, Odisha, India.
2Dr. Nirmal Kumar Rout, Assoc. Prof. Electronics and Communication Engineering, KIIT University, Bhubaneswar, Odisha, India.

Manuscript received on May 02, 2015. | Revised Manuscript received on May 09, 2015. | Manuscript published on May 31, 2015. | PP: 11-18 | Volume-2 Issue-6, May 2015. | Retrieval Number: F0296052615
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Abstract: As technology advances in the field of VLSI; the circuits are upgraded to less power consuming and of high speed. In modern digital signal processing (DSP) and graphics application the shifter is an important module. A Barrel shifter/rotator can be implemented exclusively for shifting and rotating operations individually or both at the same time and can be implemented by 2:1, 4:1, 8:1 etc. multiplexers units. Barrel shifter/rotator implemented using multiplexer unit can use it repeatedly thus reduce the amount of power consumption. In this paper initially the Barrel shifter/rotator circuit using multiplexer is implemented using Complementary Metal Oxide Semiconductor (CMOS) logic then the circuit is implemented by different low power techniques. Finally various designs are compared in terms of power and delay. All the designs are implemented in Cadence Virtuoso Tool at 45nm technology for its validation.
Keywords: Barrel shifter, Pass transistor logic, LECTOR technique, Double gate MOSFET, Diode Free Adiabatic Logic, Low power.