AW: LM398 app note

[Haible Juergen]

	>In the already mentioned Linear app. book from National I found an
	>(maybe) interesting idea: low droop s&h by using two cascaded s&h.
The
	>first uses a LM398 s&h with 1nF, the second with 1uF. The voltage
is
	>frist sampled with the fast s&h , if this is done the already
sampled
	>voltage is again sampled into the 1000x slower s&h, not much droop
will
	>happed during this time.  Then the output is switched from the fast
	>s&h to the slow one.  Better would be to fade slowly between both
s&h,
	>cause this will avoid the switching spike.

	Good idea !

	JH.