Problem with measure Rin!
From: Francesco (roxfNOSPAM_at_libero.it)
Date: 08/08/04
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Date: Sun, 08 Aug 2004 21:55:05 GMT
Hi,I have a problem with this circuit
http://digilander.libero.it/checco23/Schemi/Per_sito1.GIF , I try first
to calculate and after to measure in a simulation the value of Rin, but
the two results are much different!
Where is the mistake?
Data:
Vi= 100mV;
Ii( AC current at the transistor's base ) = 794nA;
hfe = 83.6;
re = 42 Ohm;
Ri ( calculate ) = (hfe+1)*( re + RE ) = 84.6*1042 = 88153.2 Ohm;
Ri ( measured ) = Vi/Ii = 100m/794n = 125944.6 Ohm;
The difference between the two result is too much!
Help me to understand where is my error!
Thanks !
Francesco
-- Per rispondermi in privato togli NOSPAM.
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