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Old 7th June 2008, 10:36 AM   #1
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Join Date: Aug 2004
Location: Huskvarna
Default How to calculate gain and output impedance?

I would like to know how to calculate voltage gain and output
impedance in a few impedance converters.

Please, look at the questions and the schematics here:

http://twin-x.com/groupdiy/displayimage.php?pos=-2345
http://twin-x.com/groupdiy/displayimage.php?pos=-2344


Roger
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Old 7th June 2008, 06:09 PM   #2
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Join Date: Mar 2008
Default #1

Hello Roger,
seems ok to me.
For the cascode take gm of the bottom transistor, same calculation like above.

Try a bipolar transistor. You'll be surprised! gm = Ie/UT

gm = transconductance
Ie = DC Emitter current
UT = 40mV (silicon)

Darius
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