Willy M. C. Sansen

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This paper presents an new direct--fitting method to generate posynomial response surface models with arbitrary constant exponents for linear and nonlinear performance parameters of analog integrated circuits. Posynomial models enable the use of efficient geometric programming techniques for circuit sizing and optimization. The automatic generation avoids(More)
This paper presents a method to automatically generate posynomial response surface models for the performance parameters of analog integrated circuits. The posynomial models enable the use of efficient geometric programming techniques for circuit sizing and optimization. To avoid manual derivation of approximate symbolic equations and subsequent casting to(More)
In this paper a layout-aware RF synthesis methodology is presented. The methodology combines the power of a differential evolution algorithm with cost function response modeling and integrated layout generation to synthesize RF Circuits efficiently, taking into account all layout parasitics during the circuit optimization. The proposed approach has(More)
This paper presents an automated, layout-aware RF LC-oscillator design tool, called CYCLONE that delivers an accurate and optimal LC-oscillator design, from specification to layout. The tool combines the accuracy of device-level simulation and finite element analysis with the optimisation power of simulated annealing algorithms and is verified with(More)
This paper describes a new DC modeling methodology applicable to CMOS integrated circuits. It is named operating point driven DC formulation because the operating point is specified directly , and the device dimensions W and L are determined out of it. With other methods, one specifies the device dimensions W and L and determines the operating point. Our(More)
A new approach is presented for the construction of behavioral models for harmonic oscillators and sets of coupled harmonic oscillators. The models can be used for system-level simulations and trade-off analysis. Besides the steady state behavior, the model also takes the transient behavior of the oscillation amplitudes and phase differences into account.(More)
This paper presents a new method to automatically generate posynomial symbolic expressions for the performance characteristics of analog integrated circuits. The coefficient set as well as the exponent set of the posynomial expression are determined based on SPICE simulation data with device-level accuracy. We will prove that this problem corresponds to(More)
A new method for the testing and fault detection of analog integrated circuits is presented. Time-domain testing followed by spectral analysis of the power-supply current is used to detect both DC and AC faults. Spectral analysis is applied since the tolerances on the circuit parameters make a direct comparison of waveforms impossible. For the fault(More)