Implementation of ACRA for Biomedical Image Enhancement with an Improved Design

In the modern VLSI technology, today’s huge usage and importance of portable systems creates a demand for reducing the heat and power consumption in the circuits. To achieve superior performance, applications consuming low power is mandatory. Based on these reasons, the VLSI technology has a fast growth in creating CMOS circuits that consumes low power. Approximate computing is an effective technique in order to minimize the cost of computing. This technique necessitates a trade-off among the power dissipation of the circuit, delay and its performance. However, the accuracy needs may vary for distinct applications. In certain circumstances, accurate outputs are needed. Hence, this paper presents an accuracy-configurable radix-4 adder (ACRA) that utilizes the power gating methodology to switch on or off an adder’s partial logic gates for effectively computing the approximate and accurate outputs. In order to reduce the error distance among the accurate and approximate outputs, the partial sum of a single adder section is altered, when the ACRA is functioning in the approximate mode form. ACRA is compared with other accuracy-configurable adders such as RCA, CLA and RD-4A.The result indicates that the ACRA outperforms other adders in terms of accuracy and the power delay product. Moreover, in this paper, an image processing assessment was carried out for 8-bit ACRA thus achieving higher the peak signal-to-noise ratio and lower mean square error value producing better quality image.