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Class D Switching Power Amplifiers and Power D/A conversion

Tripath patents list
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Old 3rd January 2007, 12:20 PM   #11
fokker is offline fokker  China
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Originally posted by phase_accurate
I still don't understand how their first patent could be issued since it is 1.) obvious to me and 2.) has been discussed before they even filed.Charles

a patent can be issued even if it is invalid. patent challenges are everywhere.
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Old 2nd November 2014, 02:37 PM   #12
Mikelandjelo is offline Mikelandjelo  Serbia
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https://www.google.com/patents/US636...ed=0CB4Q6AEwAA there r no pictures for this one
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Old 2nd November 2014, 06:45 PM   #13
theAnonymous1 is offline theAnonymous1  United States
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Originally Posted by Mikelandjelo View Post
I see you've piqued an interest in Tripath. Here's a link to 17 Tripath application note pdf's....

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Old 22nd December 2016, 02:50 PM   #14
kees52 is offline kees52  Netherlands
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Originally Posted by koolkid731 View Post
Sigma delta modulation with noise shaping results in very high bit rate. So Tripathi's patent looks at the bit pattern say 10101010 at 1Mhz and changes it to 11001100, which translates into 500kHz output switching rate.

Potential problems with that are:

inherent delay in the closed loop feedback
audio artifacts that some audiophile may hear

IMHO there's nothing better than analog feedback of self oscillating amps. With analog feedback, 0.001% THD is doable. That's 60 times better than Tripath's sigma-delta, and no HF noise vs harsh sound of Tripath.

Indeed, although human can't actively hear f>20khz, we can FEEL the difference when a 20kHz brickwall LPF is inserted into a good amp. Cymbal's harmonics go past 150kHz. We rely on them for directivity of the sound (soundstage)
It is somehatw old thread but I did read sigma delta or the tripath did excite some audiophiles with the very open sound and no harse output. I did read the self oscilating ones did not the same get a more flat sound without depth.

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