The analysis of intermodulation distortion in microwave mixers by the Newton-iteration based harmonic-balance technique may lead to numerical problems of unmanageable size, especially for modern multiple-device topologies. The paper describes a sparse-matrix approach providing an effective solution to this shortcoming. Selected entries of the Jacobian matrix are set to zero according to some physical criterion, which leads to a sparse matrix with a predetermined pattern of nonzeroes. A specially developed sparse-system solver may then be applied with optimum efficiency. Both memory storage and CPU time are reduced by two orders of magnitude in the analysis of a typical distributed device.
Rizzoli Vittorio, Lipparini Alessandro, Mastri Franco, Neri Andrea, Sgallari Fiorella, Frontini Valeria (1990). Intermodulation analysis of microwave mixers by a sparse-matrix method coupled with the piecewise harmonic-balance technique, 1(20), 189-194 [10.1109/euma.1990.336042].
Intermodulation analysis of microwave mixers by a sparse-matrix method coupled with the piecewise harmonic-balance technique
Rizzoli Vittorio;Lipparini Alessandro;Mastri Franco;Sgallari Fiorella;
1990
Abstract
The analysis of intermodulation distortion in microwave mixers by the Newton-iteration based harmonic-balance technique may lead to numerical problems of unmanageable size, especially for modern multiple-device topologies. The paper describes a sparse-matrix approach providing an effective solution to this shortcoming. Selected entries of the Jacobian matrix are set to zero according to some physical criterion, which leads to a sparse matrix with a predetermined pattern of nonzeroes. A specially developed sparse-system solver may then be applied with optimum efficiency. Both memory storage and CPU time are reduced by two orders of magnitude in the analysis of a typical distributed device.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
