I was recently diving down the "distortion" rabbit hole. I had an idea about getting rid of crossover distortion. But I hit a snag. The idea was to use an all-pass filter and have it be triggered by a ZCD. I was thinking of the all-pass being an elliptical as well (for the steep curve) but I'm not sure I would want all that ripple. I guess I have two questions then:
1) is this feasible in the analog domain?
2) what filter would give me a steep enough curve to be right on top of the zero crossing? For that matter, would I even need such a steep curve?
1) is this feasible in the analog domain?
2) what filter would give me a steep enough curve to be right on top of the zero crossing? For that matter, would I even need such a steep curve?
Well that's what I'm getting at: to get that kind of delay action, I would figure an all-pass filter would be the way to go. However, if there is something out there that is more practical (I mean technically this is overengineering at its finest, but you get what I mean...) then I'm all ears.What curve do you want to be steep?
Here's where I got the idea
https://en.m.wikipedia.org/wiki/All-pass_filter
https://en.m.wikipedia.org/wiki/All-pass_filter
Hopefully that should helpThe resistor can be replaced with a FET in its ohmic mode to implement a voltage-controlled phase shifter; the voltage on the gate adjusts the phase shift.