Features in Class-D modulator

dusfor99 · 24th October 2006, 07:30 AM

Im currently thinking about designing a Digital Class-D modulator. I was wondering what you guys think are the more important features to have. I was thinking that having a SPDIF input might be useful, but perhaps not. I do have some experience in making digital PWM loops that are capable of better than 100dB of DNR with a flat frequency responce (well within 0.25) to past 20k. Im thinking of trying some new ideas for my next hobby project (the class-D modulator) but I would like some feedback from people that actaully care about this kind of thing.

Thanks

CLD

BWRX · 24th October 2006, 11:01 AM

Features: 0-3.3V PWM output capability so it can be used as a front end for this

dusfor99 · 24th October 2006, 03:02 PM

Hi Brian,

Yes the current way I do designs is by using an FPGA to prototype the modulator, then I use either TI's or STA's power stages. Another thing I thought would be cool is if the 0 to 3.3V output could be very low impedance so that it may drive headphones. I have actually done this aswell aobut a year ago and found I could make quite a lot of power at a respectable THD. (I compared it to some linear haedphone amps and it beat them in every spec). Im just trying to compile idea's for the next prototype. Thanks for the feedback

CLD

24th October 2006, 07:30 AM	#1
dusfor99 diyAudio Member Join Date: Oct 2006	Features in Class-D modulator Im currently thinking about designing a Digital Class-D modulator. I was wondering what you guys think are the more important features to have. I was thinking that having a SPDIF input might be useful, but perhaps not. I do have some experience in making digital PWM loops that are capable of better than 100dB of DNR with a flat frequency responce (well within 0.25) to past 20k. Im thinking of trying some new ideas for my next hobby project (the class-D modulator) but I would like some feedback from people that actaully care about this kind of thing. Thanks CLD

24th October 2006, 11:01 AM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	Features: 0-3.3V PWM output capability so it can be used as a front end for this __________________ Brian

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24th October 2006, 03:02 PM	#3
dusfor99 diyAudio Member Join Date: Oct 2006	Hi Brian, Yes the current way I do designs is by using an FPGA to prototype the modulator, then I use either TI's or STA's power stages. Another thing I thought would be cool is if the 0 to 3.3V output could be very low impedance so that it may drive headphones. I have actually done this aswell aobut a year ago and found I could make quite a lot of power at a respectable THD. (I compared it to some linear haedphone amps and it beat them in every spec). Im just trying to compile idea's for the next prototype. Thanks for the feedback CLD

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