I have an interesting idea for improved temperature control. I'll test it out with an analogue feedback loop, but just for future....
Say I want to make a feedback loop that has both high resolution and high speed, e.g. 100 kHz bandwidth, maybe 300 kHz update rate or a bit faster. (The critical dimension is small, so it can be fast.)
I'm willing to devote a whole small uC to the job. Control needs to be on-off, because I want to use a small FET to control the heater. The ideal case would be one uC, a resistor bridge, a bypass cap, and a FET.
What's the best s/w architecture for this? 4-bit PWM with delta-sigma? Any other pointers?
Thanks
Phil Hobbs