Accurate waveform modeling using singular value decomposition with applications to timing analysis
Proceedings of the 44th annual Design Automation Conference
Compact modeling of variational waveforms
Proceedings of the 2007 IEEE/ACM international conference on Computer-aided design
Driver waveform computation for timing analysis with multiple voltage threshold driver models
Proceedings of the 45th annual Design Automation Conference
Addressing library creation challenges from recent Liberty extensions
Proceedings of the 45th annual Design Automation Conference
Proceedings of the Conference on Design, Automation and Test in Europe
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This paper describes a waveform compression technique suitable for the efficient utilization, storage and interchange of the emerging current source model (CSM) based cell libraries. The technique is based on pre-processing of a collection of voltage/current waveforms for the cells in the library and then, constructing an orthogonal time-voltage/time-current waveform basis using singular-value decomposition. Compression is achieved by representing all waveforms as linear combination coefficients of adaptive subset of the basis waveforms. Experimental results indicate that adaptive waveform representation results in higher compression ratios than the waveform representation as a function of fixed set of basis functions. Interpolation and further compression are obtained by representing the coefficients as simple functions of various parameters, e.g., input slew, load capacitance, supply voltage, and temperature. The methods introduced in this paper are tested and validated on several industrial strength libraries, with spectacular compression results.