Need a circuit to noise test BJTs

Something like this?
 

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effebi

Member
2010-11-10 11:08 pm
Milan
I really appeciate the idea. In the short time that I am readig this forum, I have seen that much concern is taken for THD, then less for offset, but very few for noise. If I remember well the noise should be indeed of concern specially with FET transistors that should (correct me if I am wrong) be affected of 1/f noise. Also I never have seen explicitely (maybe it was done anyway) dimensioning resistors for noise avoiding. I mean trading a higher dissipation with a smaller R. This is done always when you design measurement instruments. Sometimes I had also the impression ( i should research on that) that sophisticated schematics (i.e. cascoded and double CCSs, especially Zener ones) besides of the linearity (read THD) advantages may bring in additional noise. Very interesting post
effebi