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Re: transient test - Part II

Hi JC,

> leads to adding compensation, and thereby slowing the gain bandwidth
> of the total circuit below that of a simple follower.

This actually makes sense to me. Considered as part of a global
feedback loop, in that context, closing the loop, gets you the
linearity.

I ran some frequency sweeps for various followers


Circuit MidBand Gain -3dB Frequency
Simple .796764 .563312 2.1574Mhz
Sziklai uncomp potentially unstable potentially unstable potentially unstable
Sziklai comp (3900pF) .991296 .700846 569.105Khz
Darlington .966362 .683218 1.2323Mhz
Hawksford uncomp .951225 .672516 3.8531Mhz
Hawksform comp (190pF) .951225 .672516 3.0639Mhz

It looks like the Hawksford would be very interesting to
investigate as it has a wider bandwidth then a simple follower
and may be more linear as well. Even its uncompensated form shows
only a slight hump rising from .951225v to 1.0077v at 1.875Mhz.




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