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A symmetry device to speed up circuit simulation and stability tests

Ein Symmetrieelement zur Beschleunigung von Schaltungssimulation und Stabilitätstests
 
: Ramberger, S.; Merkle, T.

:

Hamilton, R. ; IEEE Microwave Theory and Techniques Society:
IEEE MTT-S International Microwave Symposium digest 2002. Vol.2 : June 2 - 7, 2002, Washington State Convention & Trade Center, Seattle, Washington
Piscataway, NJ: IEEE, 2002
ISBN: 0-7803-7239-5
ISBN: 0-7803-7240-9
pp.967-970
International Microwave Symposium (IMS) <2002, Seattle/Wash.>
English
Conference Paper
Fraunhofer IAF ()
symmetry device; Symmetrieelement; odd-mode stability; Gegentaktstabilität; push-pull oscillation; Gegentaktoszillation; Nyquist criterion; Nyquistkriterium; high power; amplifier; Leistungsverstärker; HPA

Abstract
A new simulation device is introduced that employs symmetry considerations in order to speed up network analysis of circuits with parallel branches. Such parallel branches are found e.g. in amplifiers with corporate combiners and push-pull oscillators. The device may be switched between two states, a symmetry and an antisymmetry state. The former is used in normal or even-mode operation and reduces the paralleled branches to a single branch, thus scaling down the time needed for the circuit setup as much as the simulation time. The other state allows for rigorous odd-mode stability analysis when combined with a circulator stability test port. The device is easily implemented in standard circuit simulation programs.

: http://publica.fraunhofer.de/documents/N-11052.html