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Old 3rd December 2006, 07:02 PM   #1
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Default Oen loop preamp topology questions

I`m still a biginer in a audio construction water and there`s some things I`d like to ask...

1. I noticed that the distortion (let`s cosider only preamplifiers) could be pulled to the wanishing levels using local feedbac only! (High degeneration)
I made the open loop single ended (two stage) mosfet preamplifier and the simulation results are VERY good:
harmonic content below fundamental at 3V output:
2nd-80dB
3rd-113dB
5th-124dB

distortion at 100KHz=0.03%
(Open loop) bandwidth 300KHz(-1dB)

THE MAIN QUESTION:
If we do not cosider that preamp is capacitor coupled and it runs on 240V(so it is more expensive), WHY designer use a global feedback over local? Is that only the money issue or this topology has other disadvantages? (the thread is related only to the preamps)


CHEERS!
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