Title: A novel approach for parameter determination of HBT small-signal equivalent circuit
Authors: Chen, HY
Chen, KM
Huang, GW
Chang, CY
Department of Electronics Engineering and Institute of Electronics
Keywords: HBT's;small signal modeling;T-topology;hybrid-pi equivalent circuit
Issue Date: 1-Jun-2005
Abstract: Direct parameter extraction is believed to be the most accurate method for equivalent-circuits modeling of heterojunction bipolar transistors (HBT's). Using this method, the parasitic elements, followed by the intrinsic elements, are determined analytically. Therefore, the quality of the extrinsic elements extraction plays an important role in the accuracy and robustness of the entire extraction algorithm. This study proposes a novel extraction method for the extrinsic elements, which have been proven to be strongly correlated with the intrinsic elements. By utilizing the specific correlation. the equivalent circuit modeling is reduced to an optimistation problem of determining six specific extrinsic elements. Converting the intrinsic equivalent circuit into its common-col lector configuration, all intrinsic circuit elements are extracted using exact closed-form equations for both the hybrid-pi and the T-topology equivalent circuits. Additionally, a general explicit equation on the total extrinsic elements is derived, subsequently reducing the number of optimization variables. The modeling results are presented, showing that the proposed method can yield a good fit between the measured and calculated S parameters.
URI: http://dx.doi.org/10.1093/ietele/e88-c.6.1133
ISSN: 0916-8524
DOI: 10.1093/ietele/e88-c.6.1133
Volume: E88C
Issue: 6
Begin Page: 1133
End Page: 1141
Appears in Collections:Articles