AW(2): Tri 2 Sin

[Haible Juergen]

	> information about temperature compensation. Have you ever testet
the
	> above mentioned 3080 converter at different module case
temperatures ?
	> Say Tj=10C (winter situation) and Tj=50C (summer). If the
differential
	> stage is heated up, it should appear that it is more overdriven,
ie.
	> if you adjust the triangle amplitude at Tj=30C for minimum
distortion
	> it may well be that at Tj=50C the sine output has a lot more
	> distortion. 

Good point. I have seen 3080-based VCOs which compensated for the
temperature dependence of transconductance with diodes used to set the
comparator's threshold voltage. Temperature compensation for the frequency,
and a temperature dependent triangle amplitude. Perfect fit for the
following
3080-based sine shaper ...


	>And last but not least: is any loadspeaker capable to reproduce a
sine
	>wave as such? Not mine! From this point of view it is a good
quiestion
	>how much distortion of a "sine" wave can be tolerated.

Don't know. My headphones definitely monitor the difference of a sine
from a waveshaper and a sine from an oscillating 4pole filter.

JH.