BPath-RO: A Performance- and Area-Efficient In Situ Delay Measurement Scheme for Digital IC

Author:

Li Danqing1,Liang Huaguo1,Zhang Hong1,Wang Yue1,Yi Maoxiang1,Lu Yingchun1,Huang Zhengfeng1

Affiliation:

1. School of Microelectronics, Hefei University of Technology, Hefei 230601, China

Abstract

Circuit delays are increasingly sensitive to process, voltage, temperature, and aging (PVTA) variations, severely impacting circuit performance. Accurate measurement of circuit delay is essential. However, the additional hardware structures for measuring circuit delay add to the critical path delay. To address this issue, this paper proposes a bypass-based ring oscillator (BPath-RO) that reduces the impact on the critical path delay by moving the added measurement control structures to the bypass. The proposed measurement scheme requires only two transistors inserted into the critical path, which is more conducive to engineering change order (ECO). Measurement simulation experiments were performed on representative critical paths of the ISCAS’89 s298 and ITC’99 b15 benchmark circuits. The experimental results show that, in comparison with the existing architectures, the Bpath-RO delay measurement scheme improves the circuit performance by an average of 13.81% (s298) and 3.47% (b15) and reduces the hardware overhead by up to 70% for each path.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering

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