2016, Vol. 1, No. 2, 49-53

In this paper a general model for array-based approximate arithmetic computing (AAAC) is proposed to guide the minimization of processing error. In this model the key building block of AAAC circuits is the Error Compensation Unit (ECU). While designing the ECU, the two most critical problems are identified viz., determination of optimal error compensation values and identification of optimal error compensation scheme. This general AAAC model achieves optimal trade-offs between accuracy, energy and area overhead. Further reduction in area, energy dissipation and delay of AAAC can be achieved by simplifying ECU's design by introducing logic don't cares. Another unit that plays a key role next to the ECU is the Compression Unit (CU). By using a 5:2 compressor, area can be further minimized. Using the same approach, significant energy consumption and area and error reduction can be achieved in a squarer unit. ARTICLE HISTORY Received 15 June 2016 Revised 30 August 2016 Accepted 09 September 2016