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Extraction of the parameters of equivalent circuits of microwave transistors using tree annealing

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5 Author(s)
Bilbro, G.L. ; Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC, USA ; Steer, M.B. ; Trew, R.J. ; Chang, Chao-Ren
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The problem of extracting a physically based equivalent circuit model for a heterostructure bipolar transistor (HBT) from S-parameter measurements is solved with a new formulation of simulated annealing. The physical model necessary for an accurate representation of the HBT leads to an extraction problem with many local minima. A satisfactory minimum can be found by conventional gradient-based techniques only with considerable expert guidance. The proposed algorithm finds equivalent circuits as good as those from conventional techniques but without human intervention. It is more efficient than conventional stochastic simulated annealing because it accumulates a probability density of good equivalent circuits which it subsequently uses to refine its statistical search for the best equivalent circuit

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:38 ,  Issue: 11 )

Date of Publication:

Nov 1990

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