What is the importance of IQ in a common emitter stage? - diyAudio
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Old 30th November 2012, 08:05 PM   #1
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Default What is the importance of IQ in a common emitter stage?

What need to be considered as far as choosing the IQ point of a common emitter stage intended to drive a common collector stage? I'm referring to the CE stage with an RC and RE.

I suppose meaning, what parameters do IQ effect?

Input resistance? Current drive capability? Open loop hfe? etc
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Old 30th November 2012, 11:46 PM   #2
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The short answer is that it affects all of the above. Below is a screen from a datasheet from a 2n3906 showing how parameters are affected by the difference in Iq.
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File Type: jpg ScreenHunter_01 Nov. 30 19.44.jpg (125.3 KB, 47 views)
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Old 1st December 2012, 04:13 AM   #3
DUG is offline DUG  Canada
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Bandwidth, noise...the list goes on.

Design is a compromise where you pick some of what you want and the rest you get what you get.

lots of fun.

Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
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