ACBAM-Accuracy-Configurable Sign Inclusive Broken Array Booth Multiplier Design

Approximate computing technique has been adopted in recent years to develop low power design solutions targeted towards error-tolerant applications. Since the accuracy requirements of an application can vary dynamically at run-time, there is a justified need to design reconfigurable approximate circuits with varying power requirements proportional to computational accuracy. In this article, we have proposed a novel accuracy reconfigurable approximate booth multiplier circuit. The design involves partial error correction through the addition of sign bits in a broken array multiplier. The design space of sign inclusive 16-bit broken array multipliers is thoroughly analyzed to include only non-redundant accuracy modes. The horizontal and vertical breaks introduced in the booth multiplier circuit are controlled using external control signals stored in a ROM. The proposed reconfigurable multiplier achieves significant power savings compared to accurate multiplier circuit and state-of-the-art accuracy configurable multiplier designs.