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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: 1st cycle distortion mainly measures bandwidth posted by jcox on August 13, 2004 at 08:55:03:
jcox,I agree completely, and it's to your credit for discovering this connection. And not only just the bandwidth, but also the leading-edge transient response as well. If there's ringing, that will completely mess up the "first cycle distortion". Ironically, his "solution" of having very large bandwidth only makes the amp more susceptible to capacitive loads, which will introduce ringing. That's likely to give much worse first cycle distortion than just a single-pole filter type of response. I've made an LTSpice file of his simulated loudspeaker load, and its impedance phase angle is -5.1 degrees at 20 kHz, approaching zero monotonically as the frequency increases. So in the frequency region where stability could be compromised with capacitive loads due to excessive loop bandwidth, his simulated loudspeaker load is essentially a pure resistor. AFAIK, his first cycle distortion results are based purely on simulation rather than measurement, so it appears his results so far just don't model this effect at all. It's likely that a capacitor in parallel with this load would blow his results right out of the water.
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- Re: 1st cycle distortion mainly measures bandwidth - andy_c 19:05:18 08/13/04 (0)
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