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| 21:29.26 | xentrac | hi. I was reading Stephen Woodward's EDN design idea at https://www.edn.com/design/analog/4329365/Combine-two-8-bit-outputs-to-make-one-16-bit-DAC the other day, and it seemed super awesome |
| 21:35.15 | xentrac | so I thought it would be interesting to see if I could do the output filtering and summing purely reactively, in order to get a high-efficiency class-D amplifier with a lot less residual ripple |
| 21:35.53 | xentrac | I put together a crude simulation at https://is.gd/reactivedac, which does seem to more or less work |
| 21:37.46 | xentrac | it's tuned for audio reproduction, but for the sim, I'm using 80kHz PWM in order to see how it performs under sort of worst-case circumstances |
| 21:38.32 | xentrac | and the thing I'm not sure about is whether maybe the inversion stuff doesn't actually contribute anything in this case |
| 21:40.41 | xentrac | I mean ac-coupling through the inverted signal requires a capacitor, and maybe it would work just as well to, say, use a Ï-topology LC output filter instead of the two-pole reference design I have at the top of the schematic there |
| 21:41.40 | xentrac | it does work better than just the two-pole design |
| 21:42.42 | xentrac | I'm curious what people who really know stuff about audio amplifiers think |
| 21:42.58 | xentrac | wpwrak had recommended that I talk to someone here, but I can't remember who it was :) |
| 21:51.16 | xentrac | Woodward's original design used a couple of layers of 74HC04 powered from a precision voltage reference, and had a bunch of other really interesting design features (including the 16-bit resolution feature touted in the title) |