Capturing time-of-flight delay for transient analysis based on scattering parameter macromodel

Authors:
Haifang Liao;Wayne Wei-Ming Dai
Affiliations:
Computer Engineering, University of California, Santa Cruz, CA;Computer Engineering, University of California, Santa Cruz, CA
Venue:
ICCAD '94 Proceedings of the 1994 IEEE/ACM international conference on Computer-aided design
Year:
1994

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Abstract

The delay associated with transmission line networks consists of the exponentially charging time and a pure propagation delay. This propagation delay, so called time-of-flight delay, is particularly evident in long lines. When the time-of-flight is comparable to the input rise-time, it is difficult to capture the time-of-flight with a finite sum of exponentials. Therefore the time-of-flight must be captured explicitly from the transfer function of the circuit. In this paper, we give a precise definition of the time-of-flight together with some basic properties, and present an efficient method to capture the time-of-flight for general interconnect networks. Based on our scattering parameter macromodel, we can easily capture the time-of-flight during the network reduction while using lower order model to evaluate the charging delay. By capturing the time-of-flight delay, the accuracy of system responses can be greatly improved without significantly increasing computing time.