IEEE
(Ed.)
In this paper we present an approximate division
scheme for Scaled Population (SP) arithmetic, a technique that
improves on the limitations of stochastic computing (SC). SP
arithmetic circuits are designed (a) to perform all operations
with a constant delay, and (b) they use scaling operations to help
reduce errors compared to SC circuits. As part of this work,
we also present a method to correlate two SP numbers with a
constant delay. We compare our SP divider with SC dividers, as
well as fixed-point dividers (in terms of area, power and delay).
Our 512-bit SP divider has a delay (power) that is 0.08× (0.06×)
that of the equivalent fixed-point binary divider. Compared to a
equivalent SC divider, our power-delay-product is 13× better.
Index Terms—Approximate Arithmetic, Stochastic Computing,
Computer Arithmetic, Approximate Division, Fast Division
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