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Class D Switching Power Amplifiers and Power D/A conversion

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Old 13th January 2005, 05:14 AM   #31
Kenshin is offline Kenshin  China
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Location: China
Now,audio amplifier industry is now at its "Bakumatsu" time.
The story,is not yet ended....

When achieveing for deep feedback & fast response,it's far easier to let the system oscillate than remain it stable. High-frequency unstable system may even have better perfomance at audio fequencies. Designing linear amplifiers is an art of tradeoff between performance and high frequency stibility.

The boom of self-oscillating D-AMP today is something like the boom of chaos(random oscillations in nonlinear systems) in 1970s~~1980s.

It's first considered something highly advanced, then turns out to be something happening everywhere but we always disliked and tried to prevent.

But at last,there will be some hard core remining. Though building a chaotic system costs only a few lines of code or a few RMBs components, it's hard to understand a chaotic system clearly even today. Optimizing a D-AMP including its nonlinear nature may be far difficult than merely build it.

The mysterious nonlinearity are now causing a dramatic revolution again -- just as it has done in math & physics.

...The new age.
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Old 14th January 2005, 06:44 AM   #32
Pabo is offline Pabo  Sweden
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Location: Helsingborg, southern sweden

I enjoy reading your posts

The ucd topology also oscillates at 180 degress lag, the zero is only there to more accurately set the switching frequency. Relying completely on parasitics for creating 180 degrees phase lag would give bad precision and large temperature dependancy. You could actually also put in a lag in order to more accurately set the frequency but it would lower the frequency which is more impractical.
If something that measures good doesn´t sound good, measure again!
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