Hello,
Medtronic wants to drive a square wave of current at 50-100mA, source and sink, at 500kHz. I originally proposed some of our power amplifiers but they responded with:
So a digital part is really what I’d prefer, if such exists. If we were to use an analog part to drive a sinusoidal current, we’d need to figure out how to make the amplitude repeatable. The max slew rate varies enough that just driving it with a square wave doesn’t look very repeatable. Also, I’m going to use 16 of these per board, so cost matters. I’ve found synchronous buck controllers in the 10 to 20 cent range that get close to what I want, but I haven’t figured out how to get them to tri-state. Maybe this sketch helps explain what I’m trying to do. When the drivers are disabled, I want their output to be high impedance.
Is this something that a comparator would be better for? The comparators parametric table does not have output current as something you can filter on. Is there a good way to do it with an op amp?
John
