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Need advice: class D amplifier

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jcpu

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3v class d amplifier

Dear Sir:

Trying to build a class D audio amplifier. Target specs are:
(1) 3V power supply,
(2) 20KHz signal bandwidth,
(3) 16Ohm AC load,
(4) Peak swing 2Vpp,
(5)<1% THD,
(6) Dynamic range > 80dB

Need some design advice or references.
(lease skip applicaion-notes web-sites like TI or ADI...)

Or please give me link in case this has been covered bofore on this board,
Thanks in advance,
 

throwaway18

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50Khz is much higher than you need for audio. 20KHz is enough. Most people can't hear above 16KHz.

2Vpp= 0.707Vrms, with a 16ohm load thats only 30milliwatts. It's barely worth the hassle of using a class D amp.

The Texas instruments tpa2005d1 might be suitable.
 

    jcpu

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jcpu

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Thanks throwaway18.

Checked with system guy, and
I have corrected the output bandwidth to 20KHz.

Considering implementing such audio output device onto our chip,
where left half circuits looks like familiar DC/DC circuit blocks (?),
But what is the art of right half circuits (namely, de-glitch, gate-drive, power N/PMOS)
... they just appear to be too simple??? Coud we implement this half
by standard CMOS logic cell library provided sufficient power handling capability???
 

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