kyak changed the topic of #qi-hardware to: Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben/atusb 802.15.4 wireless, anelok and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs and http://irclog.whitequark.org/qi-hardware
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<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
<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
<xentrac> I put together a crude simulation at https://is.gd/reactivedac, which does seem to more or less work
<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
<xentrac> and the thing I'm not sure about is whether maybe the inversion stuff doesn't actually contribute anything in this case
<xentrac> I mean ac-coupling through the inverted signal requires a capacitor, and maybe it would work just as well to, say, use a π-topology LC output filter instead of the two-pole reference design I have at the top of the schematic there
<xentrac> it does work better than just the two-pole design
<xentrac> I'm curious what people who really know stuff about audio amplifiers think
<xentrac> wpwrak had recommended that I talk to someone here, but I can't remember who it was :)
<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)