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, 43 views)
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Old 1st December 2012, 04:13 AM   #3
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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.

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