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ABSTRACT
Moments of the impulse response are widely used for interconnect delay analysis, from the explicit Elmore delay (first moment of the impulse response) expression, to moment matching methods which create reduced order transimpedance and transfer function approximations. However, the Elmore delay is fast becoming ineffective for deep submicron technologies, and reduced order transfer function delays are impractical for use as early-phase design metrics or as design optimization cost functions. This paper describes an approach for fitting moments of the impulse response to probability density functions so that delays can be estimated from probability tables. For RC trees it is demonstrated that the incomplete gamma function provides a provably stable approximation. The step response delay is obtained from a one-dimensional table lookup.
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CITED BY 24
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Tao Lin , Emrah Acar , Lawrence Pileggi, h-gamma: an RC delay metric based on a gamma distribution approximation of the homogeneous response, Proceedings of the 1998 IEEE/ACM international conference on Computer-aided design, p.19-25, November 08-12, 1998, San Jose, California, United States
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Xiaodong Yang , Walter H. Ku , Chung-Kuan Cheng, RLC interconnect delay estimation via moments of amplitude and phase response, Proceedings of the 1999 IEEE/ACM international conference on Computer-aided design, p.208-213, November 07-11, 1999, San Jose, California, United States
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Bernard N. Sheehan, Predicting coupled noise in RC circuits by matching 1, 2, and 3 moments, Proceedings of the 37th conference on Design automation, p.532-535, June 05-09, 2000, Los Angeles, California, United States
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Chandramouli V. Kashyap , Charles J. Alpert , Frank Liu , Anirudh Devgan, PERI: a technique for extending delay and slew metrics to ramp inputs, Proceedings of the 8th ACM/IEEE international workshop on Timing issues in the specification and synthesis of digital systems, December 02-03, 2002, Monterey, California, USA
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Charles J. Alpert , Frank Liu , Chandramouli Kashyap , Anirudh Devgan, Delay and slew metrics using the lognormal distribution, Proceedings of the 40th conference on Design automation, June 02-06, 2003, Anaheim, CA, USA
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Chandramouli V. Kashyap , Charles J. Alpert , Frank Liu , Anirudh Devgan, Closed form expressions for extending step delay and slew metrics to ramp inputs, Proceedings of the 2003 international symposium on Physical design, April 06-09, 2003, Monterey, CA, USA
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INDEX TERMS
Primary Classification:
C.
Computer Systems Organization
C.1
PROCESSOR ARCHITECTURES
C.1.2
Multiple Data Stream Architectures (Multiprocessors)
Subjects:
Interconnection architectures (e.g., common bus, multiport memory, crossbar switch)
Additional Classification:
B.
Hardware
B.4
INPUT/OUTPUT AND DATA COMMUNICATIONS
B.8
Performance and Reliability
C.
Computer Systems Organization
G.
Mathematics of Computing
G.1
NUMERICAL ANALYSIS
G.4
MATHEMATICAL SOFTWARE
Subjects:
Algorithm design and analysis
J.
Computer Applications
General Terms:
Algorithms,
Design,
Experimentation,
Measurement,
Performance,
Reliability,
Theory
Keywords:
ISM frequency band,
RF CMOS,
digital radio,
spread spectrum communication,
transceiver
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