I have favored triangle wave oscillators in my designs.
I use two comparators at Vdd/3, 2*Vdd/3 (ala the
NE555) because it's hard or impossible to get a clean
triangle wave all the way to the rail.
I use switched current sources / sinks, a "1X" always-on
and a "-2X" that toggles. The comparators drive S, R
inputs of a SRFF and the SRFF controls the "-2X" source.
Simulator 'hates' 22uH, 10mOhm, 9A idc inductors
....
A quirk is e.g. simulator gives error when Vsupply is 3V and Vin is 3V but not if Vin is raised to 3.01V.
PI is a type II compensator. PID with two more poles is TypeIII.
How much voltage do you have? I made a custom 300khz modulator with a triangle using a transistor current source topology. But I had 10V and made a triangle between maybe 1-4V. The triangle was very good.
Hi,
Thanks. Looking at possibility of adding voltage feed-forward, as well, hopefully.
...3V supply and supply - 2V on comparator input across temp range... - found rail-to-rail comparators but I think they were too slow so sticking with LM193/2903 and its meagre ICMR. Is it possible to know how you made it or see a schematic, unless it's private/professional stuff?
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