CuLD: Current-Limiting Differential Reading Circuit for Current-Based Compute-in-Memory

TL;DR

This paper introduces CuLD, a circuit that automatically adjusts MAC results in current-based compute-in-memory systems to reduce deviation during high parallelism operations, enhancing accuracy.

Contribution

The paper presents a novel current-limiting differential reading circuit that improves MAC accuracy in current-based CiM by dynamically adjusting for parallelism-induced deviations.

Findings

Reduces MAC deviation during high parallelism

Improves accuracy of current-based CiM circuits

Effective for charge integration methods

Abstract

This paper proposes a circuit configuration that addresses the issue of deviation in the multiply-accumulate (MAC) results when numerous word lines are simultaneously opened in current-based compute-in-memory (CiM) circuits. The proposed circuit solves this problem by automatically shrinking the product value according to the degree of parallelism. This circuit configuration is effective for circuit methods that calculate MAC through time integration of charge.