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Efficient analytical macromodeling of large analog circuits by Transfer Function Trajectories

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2 Author(s)
De Jonghe, D. ; ESAT-MICAS, K.U. Leuven, Heverlee, Belgium ; Gielen, G.

Automated abstraction of large analog circuits greatly improves simulation time in custom analog design flows. Due to the high degree of variety of circuits this task is mainly a manual ad-hoc approach. This paper proposes an automated modeling approach for large scale analog circuits that produces compact expressions from a SPICE netlist. The presented method builds upon the state-of-the-art Trajectory PieceWise (TPW) approach. Because of their data-driven nature, TPW implementations generate models that require on-the-fly database interpolation during simulation, which is not embedded in a standard commercial design flow. Our approach solves this by recombining TPW samples as a surface in a mixed state space-frequency domain, revealing information about the circuit's nonlinear behavior. The resulting data, termed Transfer Function Trajectories (TFT), is fitted with a parametric vector fitting algorithm and further translated to system blocks. These are compatible with VHDL-AMS/Verilog-AMS, Matlab/Simulink or hand calculations at all design stages. The models show high accuracy and a speedup of 10×-40× against the ELDO simulator for large circuits up to 150 nodes.

Published in:

Computer-Aided Design (ICCAD), 2011 IEEE/ACM International Conference on

Date of Conference:

7-10 Nov. 2011