Design and Implementation of ROBA Multiplier in DSP Systems

Abstract

In this project, we will be discussing about 
ROBA(Rounding Based Approximate) multiplier 
that is high speed yet energy efficient. The 
approach is to round the operands to the nearest 
exponent of two. This way the computational 
intensive part of the multiplication is omitted 
improving speed and energy consumption at the 
price of a small error. The proposed approach is 
applicable 
to both signed and unsigned 
multiplications. We discuss three hardware 
implementations of the approximate multiplier that 
includes one for the unsigned and two for the 
signed operations. The efficiency of the proposed 
multiplier is evaluated by comparing its 
performance with those of some approximate and 
accurate multipliers using different design 
parameters. In addition, the efficiency of the 
proposed approximate multiplier is studied in two 
image processing applications, i.e., image 
sharpening and smoothing