[Don Pearce[_3_]]

On 14 Oct 2017 08:27:00 -0400, (Scott Dorsey) wrote:



A simple follower has 100% feedback and should have very very low distortion
as you note. So start changing things. Replace that current source with a
resistor. Change the source impedance using a shunt resistor. Pull the
transistor out and stick a TIP50 in (a personal favorite trick since a TIP50
has just awful linearity).
--scott

A simple follower does have 100% feedback, but unfortunately not from
the right point. The current-dependent emitter resistance fall outside
the loop, in series with the output, so it will add distortion which
gets worse as the load resistance decreases. It is this resistance
that prevents emitter followers from achieving unity gain - they are
always a bit below.

d

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