New envelope-currents method for the Simulation of weakly nonlinear communication circuits

In this paper, a novel approach to analyze weakly nonlinear microwave circuits excited by digital communications signals is reported based on a recursive algorithm. The method analyzes a time-varying linear circuit excited by appropriate nonlinear currents (NCs) with node waveforms updated in each i...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2004-04, Vol.52 (4), p.1339-1342
Main Authors: Crespo-Cadenas, C., Reina-Tosina, J.
Format: Article
Language:English
Subjects:
Algorithm design and analysis
Circuit simulation
Convergence
Digital communication
Linear circuits
MESFETs
Microwave circuits
Microwave communication
Nonlinear distortion
Signal analysis
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Summary:In this paper, a novel approach to analyze weakly nonlinear microwave circuits excited by digital communications signals is reported based on a recursive algorithm. The method analyzes a time-varying linear circuit excited by appropriate nonlinear currents (NCs) with node waveforms updated in each iteration. Simulation results are compared with harmonic balance and NC methods, showing fast convergence properties and accuracy even with only one iteration. The extension of the algorithm to the envelope-currents method gives a procedure to analyze the effects of nonlinear distortion in the case of excitation with communications signals. This approach allowed the evaluation of the spectral regrowth and adjacent channel power ratio of a MESFET amplifier at 2 GHz, with simulation results showing a good agreement with measurement data.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2004.825649