Design and Optimization of a Carry Speculative Adder for Enhanced Performance

Abstract

Abstract: Adders play a crucial role in arithmetic logic units and digital signal processors, forming one of the most complex arithmetic circuits in digital electronics. Traditional adder designs are often hindered by significant critical path delays and excessive power consumption. The proposed Carry Speculative Adder (CSPA) overcomes these limitations by integrating speculation techniques with a robust error correction mechanism, resulting in enhanced performance compared to conventional adders. In the CSPA, the sum generator and carry generator are decoupled, allowing the carry bit and partial sum bit to be computed in parallel, thus accelerating the overall computation process. Additionally, a carry prediction circuit is employed to minimize power usage and reduce computation time. To ensure result accuracy, an error detection and correction unit is integrated, which identifies faults within the partial sum generator and efficiently rectifies them. This dual approach of speculation and correction significantly enhances both speed and power efficiency, making the CSPA a highly optimized solution for modern digital systems.

Index Terms: Carry Speculative Adder (CSPA), Arithmetic Logic Unit (ALU), Critical path delay, Carry prediction circuit.