ALUSGDI: Low power arithmetic logic unit based sliced processor using GDI and MGDI

Abstract

In recent years, many digital logic circuits in terms of transistors such as Pass Transistor Logic (PTL), Complementary Metal Oxide Semiconductor (CMOS) logic and etc. have been used for implementing DSP algorithms. Gated Diffusion Input (GDI) logic is also another method for implementing digital circuits. In this work, GDI logic style is used in the proposed ALU based Filter Bank. The ALU unit of the proposed filter bank is designed by modified GDI logic. Power consumption of the entire design is also reasonably reduced using recursive parallel self-timed adder. GDI logic has three terminals which are Common Gate (G), PMOS (P)/NMOS (N) and output terminal. The number of transistors is reduced when compared to Complementary Metal Oxide Semiconductor (CMOS) logic. Hence, the reduced number of transistors eliminates the switching activity and power dissipation. The GDI logic consumes 65% less area and 91.4% less power when compared to CMOS logic. The modified GDI logic provides 77.5% area reduction when compared to CMOS logic. The experimental results obtained using the proposed ALU based Sliced Processor by employing GDI logic compared with the traditional filter bank techniques. ALU based filter bank design speeds up significantly through GDI concepts when compared to the interpolated filter bank and the design is implemented in 65 nm CMOS technology.

Keywords

• Filter bank
• DSP algorithms
• GDI
• MGDI
• Arithmetic logic unit