DEAD TIME EFFECT DISTORTION IN SHAKER POWER AMPLFIER - diyAudio
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Old 25th April 2011, 12:34 PM   #1
navnee4 is offline navnee4  India
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Default DEAD TIME EFFECT DISTORTION IN SHAKER POWER AMPLFIER

HOW TO COMPENSATE DEAD TIME EFFECT DISTORTION FOR SHAKER POWER AMPLIFIERS
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Old 25th April 2011, 08:32 PM   #2
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Impossible, it's been made by engineers abusing capslock.
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Old 29th April 2011, 11:47 AM   #3
navnee4 is offline navnee4  India
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how are class-D amplifiers surviving with out dead time compensation for power amplifiers?
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Old 29th April 2011, 02:54 PM   #4
81bas is offline 81bas  Germany
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they use deep negative feedback
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Old 29th April 2011, 04:26 PM   #5
Eva is offline Eva  Spain
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Good class D output stages have high timing precision and almost no dead time

Analyze how and where timing errors are created. Use double trace oscilloscope to compare waveforms and see the delays.
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Last edited by Eva; 29th April 2011 at 04:43 PM.
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Old 29th April 2011, 05:24 PM   #6
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Quote:
Originally Posted by Eva View Post
Good class D output stages have high timing precision and almost no dead time

Analyze how and where timing errors are created. Use double trace oscilloscope to compare waveforms and see the delays.
Timing accuracy helps to some extent. The trick is to prevent current flow through the body diode. And the transient process depends on DS capacitance, output current and voltage so DT usually is based on worst case conditions. TI employs particular DC bus inductance to mitigate shoot through.
There are ways to adjust DT automatically, not likely useful for audio... yet.
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Old 29th April 2011, 07:38 PM   #7
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can you be a bit more specific about dead time generation and gate driving so that we can help.
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