Abstract:
Approximate arithmetic circuits can be more effective if their accuracy can be controlled. In this paper, we propose
a carry selection based accuracy configurable approximate adder.
In the proposed design, longer carry chains provide better
accuracy and CSU (Carry Select Unit) gives it better delay
properties. The proposed design is generic so that multiple
accuracy levels are possible at design time. Our experiments show
that our design is considerably more accurate than the already
proposed state of the art approximate adders. The latency of the
proposed adder is also better than the state of the art adders.
