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RF integrated inductor modeling and its application to optimization-based design

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING 2012年第1期73卷 47-55页

作者： Pereira, P. Helena Fino, M. Coito, F. Ventim-Neves, M. Univ Nova Lisboa FCT Dept Engn Electrotecn Fac Ciencias & Tecnol P-2829516 Caparica Portugal

In this paper an optimization-based approach for the design of RF integrated inductors is addressed. For the characterisation of the inductor behaviour the double pi-model is used. The use of this model is twofold. On one hand it enables the generation of the inductor characterisation in a few seconds. On the other hand its integration into the optimization procedure is straightforward. For the evaluation of the model element values analytical expressions based on technology parameters as well as on the device geometric characteristics are used. The use of a technology-based methodology for the evaluation of the model parameters grants the adaptability of the model to any technology. The inductor analytical characterization is integrated into an optimization-based tool for the automatic design of RF integrated inductors. This tool uses a modified genetic algorithm (MGA) optimization procedure, which has proved its validation in previous work. Due to the design parameter constraints nature as well as the topology constraints, discrete variables optimization techniques are used. The accuracy of the results is checked against a non-commercial software.

关键词： discrete-variable optimization Spiral inductor design Technology/topology-aware inductor design Genetic algorithm

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Optimal LC-VCO design through evolutionary algorithms

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ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING 2014年第1期78卷 99-109页

作者： Pereira, P. Helena Fino, M. Ventim-Neves, M. Univ Nova Lisboa CTS Uninova Dept Engn ElectrotecnFCT P-2829516 Caparica Portugal

The need for implementing low cost, fully integrated RF wireless transceivers has motivated the widespread use CMOS technology. However, in the particular case for voltage-controlled oscillators (VCO) where ever more stringent specifications in terms of phase-noise must be attained, the design of the on-chip LC tank is a challenging task, where fully advantage of the actual technologies characteristics must be pushed to nearly its limits. To overcome phase-noise limitations arising from the low quality factor of integrated inductors, optimization design methodologies are usually used. In this paper a model-based optimization approach is proposed. In this work the characterization of the oscillator behaviour is guaranteed by a set of analytical models describing each circuit element performance. A set of working examples for UMC130 technology, aiming the minimization of both VCO phase noise and power consumption, is addressed. The results presented, illustrate the potential of a GA optimization procedure design methodology yielding accurate and timely efficient oscillator designs. The validity of the results is checked against HSPICE/RF simulations.

关键词： LC-VCO Design methodology discrete-variable optimization Evolutionary algorithms

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