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Nov 6, 2017 at 22:10 comment added Verbal Kint Hello, this is difficult to find small-signal values for bipolar transistors in data-books. Otherwise, bias your transistor to have the right voltage on the collector and slightly move the \$V_{be}\$ around the operating point. The dynamic resistance you want is \$r_\pi=\frac{\Delta V_{be}}{\Delta I_b}\$.
Nov 6, 2017 at 21:50 comment added Billy Kalfus Very interesting - in the hybrid-pi model, how did you find the value for Rpi?
Nov 4, 2017 at 11:51 history answered Verbal Kint CC BY-SA 3.0