Discrete opamp with JFET cascode input

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#22
I'm not sure what you mean. Using JFETs for J3 and J4 will give you less shot noise, but frankly the noise contribution of the cascode is minimal compared to the input devices. It is also possible to use BJTs, but they should be high beta and low Cob types
 
#23
HI

stratokaster83 It's roughly like this difference. The circuit diagram is from SUGDEN.​



1751285861735.png
 
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