|Class D Switching Power Amplifiers and Power D/A conversion|
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|27th August 2012, 02:35 PM||#1|
Join Date: Jun 2011
Class D amplifier simulation: Xover distortion
I have just simulated a Class D amplifier giving out a 82.5Hz sine wave.
….The current through the “speaker” has crossover distortion…..
Waveform of current in speaker (speaker is 8R load)
Do you know why this happens.?
All I did was get an excel file going with the duty cycle being proportional to the value of the sine at that moment…..then feed this to the simulation fet gate drivers as PWL files.
When I did a simulation of a 4KHz sine wave this “crossover distortion” was not seen
The switching frequency of the class d amplifier is 100Khz.
I can send you the LTspice simulation if you wish
Here si the LTSpice schem…
Actually here is the LTspice file in .txt form...just save it as .asc
and here are the two txt files which go in the same folder as the .asc file....
this.txt download - 2shared
this1.txt download - 2shared
Last edited by eem2am; 27th August 2012 at 02:41 PM. Reason: more info
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