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A Nonlinear Order-Reducing Behavioral Modeling Approach for Microwave Oscillators
This paper describes a novel technique to model the transient, steady state, and phase-noise behavior of microwave oscillators in the hardware description language VHDL-AMS. It can be applied to a large variety of both single-ended and differential voltage-controlled oscillators independently of the...
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Published in: | IEEE transactions on microwave theory and techniques 2009-04, Vol.57 (4), p.991-1006 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | This paper describes a novel technique to model the transient, steady state, and phase-noise behavior of microwave oscillators in the hardware description language VHDL-AMS. It can be applied to a large variety of both single-ended and differential voltage-controlled oscillators independently of their architecture. The model is derived from data obtained by a more complex circuit-level model. As opposed to input-output models of a microwave two-port, where the output follows more or less the applied input signal, the output of an oscillator depends mainly on its former state. Thus, approaches developed for input-output modeling cannot be applied. The technique proposed in this paper approximates the dynamics of the oscillator by a system of two first-order ordinary differential equations. The oscillator's nonlinear characteristics are reproduced by a multilayer perceptron neural network. In addition to reproducing the oscillator's large-signal waveform, its phase- noise characteristic in the l/f 2 and flat region is emulated. Finally, a VHDL-AMS implementation of the model is proposed and associated issues are addressed. The suitability of the model for oscillators at millimeter waves is demonstrated by examples working at 60 GHz. |
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ISSN: | 0018-9480 1557-9670 |
DOI: | 10.1109/TMTT.2009.2014483 |