Recent Trends in Control & Optimization of Power Systems

Authors: Rehana Farheen, Dr. Kaleem Fatima

Abstract: This paper presents an area efficient, low-power androbust Add Compare Select(ACS)unit for Viterbi Decoder using GDI (Gate Diffusion Input) logic. Viterbi decoder is used for decoding data encoded using Convolution Forward Error Correction codes or data that suffers from inter-symbol interference. They occur in a large proportion of digital transmission. Viterbi decoders employed in digital wireless communications are complex and dissipate large power. In present scenario the minimization of power consumption have emerged as a key design constraint over the last few years. The proposed method focuses on GDI, which is a low power technique of digital circuit design. Dynamic component of power is reduced in GDI technique as source of PMOS is not permanently connected to Vdd. It also reduces the latency of the circuit. The GDI cell is similar to the standard CMOS inverter, but there are some important differences. The ACS has been implemented using GDI cell with 0.18μm technology. The proposed design is obtained with reduced power dissipation in comparison with CMOS.