EEVblog Electronics Community Forum

General => General Technical Chat => Topic started by: uranium235 on July 08, 2011, 12:29:35 pm

Title: help current transfer characteristics of BJTs
Post by: uranium235 on July 08, 2011, 12:29:35 pm

guys i need help i want to know how to do this kind of experiment

current transfer characteristics of BJTs

   after performing this experiment the student will be able to
   -- show that leakage current is neglible, and
   -- confirm that CE current gain is constant

using 2n2907 PNP transistor

thanks alot in advance

Title: Re: help current transfer characteristics of BJTs
Post by: Bored@Work on July 08, 2011, 03:16:39 pm

Someone didn't pay attention in class and didn't read his textbook, eh?

Title: Re: help current transfer characteristics of BJTs
Post by: tecman on July 08, 2011, 05:27:16 pm

Like most BJTs, nothing is constant.  Hfe varies with them, collector current and of course, base drive.  Likewise leakage will vary with temp and voltage.  I don't think that you could show either of your assertions.

http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXttwyu.pdf (http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXttwyu.pdf)

paul

Title: Re: help current transfer characteristics of BJTs
Post by: gregariz on July 08, 2011, 07:05:26 pm

go to the library and look for a transistor book by either Milton Kiver or Delton Horn. But there are lots of others as well.