Hi all, Questions are mostly generated from AoE3 chap 8.3.
Let me start with fig 8.19. (a common emitter amp) Why is there no shot noise from the collector current through Rc? (collector resistor) I suspect this may have to do with the impedance of the C-E junction (or should I think about C-B junction??) but more on that next.
OK let me next move to section 8.3.5 and shot noise. Statement 1.) on page 488 is a little confusing from my point of view. There is no shot noise in the emitter current, not because it is current through a metallic resistor, but because the resistor has a larger impedance than the B-E junction. I can certainly get shot noise through a 1 meg metal resistor. (A reversed biased photodiode will do it.) H&H say as much a bit later, (2nd paragraph pg. 489.)
So why is there no shot noise with the collector current? or in the same vein what is the impedance of the C-E junction?
And finally why is there shot noise in the emitter follower? (fig 8.20 B.)
Thanks, George H.