Measuring AC Emitter and Base Series Resistances in Bipolar Transistors

Youichiro NIITSU  

IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.4   pp.608-614
Publication Date: 1994/04/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Integrated Electronics
semiconductor devices,  bipolar transistors,  emitter resistance,  base resistance,  

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A convenient method for determining emitter and base resistances from small signal measurements has been developed. This method is based on Neugroschel's method, but the frequency has been varied instead of varying β0. It is demonstrated that the base resistance was successfully extracted. The extracted emitter resistance depended on the collector current because of the difference between the exact gm value and the approximated one, IC/VT. It has also been shown that the proposed method is more robust than the conventional impedance-circle method even when cross-talk occurs.