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Class D Switching Power Amplifiers and Power D/A conversion

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Old 18th March 2004, 08:23 AM   #11
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ssanmor posted this design in circlotrons thread a whole back which too the feedback before the inductors. I don't know whether its been tested yet but it looks good to me.
Can anyone comment on the design?
I was thinking of using it in a competition class D amp for car audio (2-3kW)
My very first Class D pwm (switching) amplifier.

P.S Full credit to ssanmor for the design
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Old 18th March 2004, 08:30 AM   #12
TNT is offline TNT  Sweden
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Agreed - exactly !

Can someone answer IVX question - this would be interesting to know !

/j


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Originally posted by IVX
hi all,
IMHO, class D (UcD like) rather at high frequency give more advantages(transparency, detail resolution), bass&midbass just identical to class AB(to my own AB). However the difference isn't easy audible in sounds with noise like harmonics distribution(hi-hat, snare etc), but hear the difference in vocals, violins or tambourines can my wife and kids even.:-) It seems that class D have better spectral resolution, and i don't know why..
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Old 18th March 2004, 09:15 AM   #13
IVX is offline IVX  Russian Federation
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Some opinion does exist.. that amp have "zero feedback sound" because THD figures is undepend from frequency, and loop gain is constant from DC to 20kHz, and THD of the open loop system is constant from DC to 20kHz. I can do so that THD will increase with frequency (by loop components adjusting)..probably i'm not advanced listener too much.. IMHO the transparency isn't worse.
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Old 18th March 2004, 10:39 AM   #14
subwo1 is offline subwo1  United States
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Welcome back to class D discussion, Ivan. That question is a burning one, TNT. I suspect that the very phenomena involved in causing the higher overall distortion in class D, may through some strange twist of physics, actually cause the improved definition and spectral response at higher frequencies! Apologetically, with my bad ear, I am not in a position to verify better performance of the UcD vs. class AB at high frequencies. However, could this difference disappear when a high frequency response class AB is used?

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Old 18th March 2004, 10:49 AM   #15
subwo1 is offline subwo1  United States
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fr0st, ssanmor as far as I know did build that class D amp and said the sound quality was good.:-)
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Old 19th March 2004, 03:04 AM   #16
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Feedback taken before LC? Wouldn't that be Tripath class T?
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Old 19th March 2004, 07:27 AM   #17
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Quote:
Feedback taken before LC? Wouldn't that be Tripath class T?
That's not the detail that defines the Class-T amp. Most of the class-d amps take feedback from before the output filter even though it would be better taken after the filter.

The class - T amp is using delta-sigma modulation:

http://l2.espacenet.com/espacenet/vi...h&LG=de&DB=EPD

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