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what is D class amplifier

 
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daojx



Joined: 20 Jul 2003
Posts: 36
Post29 Sep 2004 15:24   what is D class amplifier
what is D class amplifier, is it belong to digital amplifier?
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flatulent



Joined: 19 Jul 2002
Posts: 4856
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Location: Middle Earth
Post29 Sep 2004 16:11   Re: what is D class amplifier
Originally this was a method of oversampling an analog signal and representing the values of the samples by pulses of areas (for fixed height this would be width) proportional to the sampled value. The amplification would be caused by making the pulses of high amplitude using digital logic techniques. These techniques would be nearly 100% efficient. The output would be low pass filtered to recover the analog signal at a higher power level. This recovery is flawed because the PWM produces harmonics with large number of sidebands which extend to baseband. These amplifiers are only used in low quality audio systems.

Since then with so many academics and magazine article writers being ignorant of the history of their technology area making new definitions, there are many more types of systems called class D.
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andy2000a



Joined: 18 Jul 2001
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Post05 Oct 2004 8:43   Re: what is D class amplifier
have any class-D ampl design document ??

thank you
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andy2000a



Joined: 18 Jul 2001
Posts: 756
Helped: 7
Post05 Oct 2004 8:47   Re: what is D class amplifier
find some doc

http://www.maxim-ic.com/appnotes.cfm/appnote_number/624/ln/en
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tlihu



Joined: 02 Jan 2002
Posts: 627
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Post05 Oct 2004 8:47   Re: what is D class amplifier
andy2000a wrote:
have any class-D ampl design document ??

thank you


I've got a paper on this topic:

Sorry, but you need login in to view this attachment
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