Post
by guest » Sun Feb 10, 2019 7:10 am
so, i dont claim to understand this completely, but here is my take on the settling time: this is basically a filter being held at a damping factor of exactly zero. the lower the damping factor, the longer it takes to settle, so this one essentially never settles. the diodes act as feedback, and change the damping factor with output amplitude, to keep it at a certain amplitude. at low ampitudes, it has a negative damping factor, and the amplitude increases; at high amplitudes the damping factor increases and the amplitude goes down. if the difference between the diodes being active or not is a small amount, directly around zero, you will get a very low distortion output that that takes a long time settle, and may not start oscillating to begin with. imagine if the damping factor was 0.001, how long it would take to settle, and essentially this diode feedback tries to keep it near zero, so it spends a fair bit of time at low values like that. but, if you were to make the difference between the diodes being active and inactive very large, then the area around zero damping would span a much larger range, and the filter would settle much quicker. unfortunately, this would also add a lot of distortion to the signal. so there is a tradeoff, you can get fast settling, but it will be more distorted.
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