ac vs dc analysis of a BJT

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praneethbobba

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Hi Guys

Can anybody explain the difference between ac and DC analysis of a BJT in detail ??On what basis do we need to carry out ac or dc analysis ? What are the parameters that can be measured in either of the analysis ?

Thanks
Praneeth
 

chuckey said:
Every parameter can be measured with the DC except for things like capacity and Ft. Every AC test should include a statement like " Hfe is 240 at a collector current (DC) of 1mA".
Frank
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Thanks Frank.

Every parameter in the sense , input impedance , output impedances can be measured ??? Also what is meant by Ft. that you mentioned in your reply

Praneeth
 

praneethbobba said:
Thanks Frank.
Every parameter in the sense , input impedance , output impedances can be measured ??? Also what is meant by Ft. that you mentioned in your reply
Praneeth
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No - of course, impedances cannot be measured using dc analysis. With dc analyses you can only measure circuit properties for 0 Hz, which means all capacitive effects are not covered.
Thus, only input and output resistances (real part of impedances) can be determined.
 

Thanks Guys for the reply .. Can you suggest any good references or book that I can refer to understand BJT analysis in a wider sense ?

Praneeth
 

Read boylestad and nashelsky electronic devices and circuits. Its a very good book for both the begineers and the intermediate level people. You can also get the e-book (I have 7th edition but the latest is 10th edition) on the internet.
 

shaswat said:
Read boylestad and nashelsky electronic devices and circuits. Its a very good book for both the begineers and the intermediate level people. You can also get the e-book (I have 7th edition but the latest is 10th edition) on the internet.
Click to expand...

Thanks Shaswat.
 

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