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Class D Switching Power Amplifiers and Power D/A conversion

full differential UcD modulator with extra integrator
full differential UcD modulator with extra integrator
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Old 17th July 2017, 03:36 PM   #81
Workhorse is offline Workhorse
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Quote:
Originally Posted by kartino View Post
You are right.

Do you have any topology description for reference for class BD?
I am thinking to make it.
Check the 5-6 page of the attached file.....
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File Type: pdf 129_DT_Series Report En.pdf (271.5 KB, 136 views)
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Old 17th July 2017, 04:59 PM   #82
kartino is offline kartino  Indonesia
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Quote:
Originally Posted by Workhorse View Post
Check the 5-6 page of the attached file.....
Thanks
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Old 17th July 2017, 05:06 PM   #83
kartino is offline kartino  Indonesia
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Kanwar,
Yess... I remember then.
I was stopped to think about BD because I think it was not possible to get better clarity with BD compared with AD. CIIW.
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Old 27th November 2017, 09:55 AM   #84
kees52 is offline kees52  Netherlands
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Originally Posted by Sous View Post
Unfortunately attachments removed



IMD test 35Vp-p
Very impressive IMD, that promise high end sounding amp, I was busy with one also with poles to get lower distortions, but time is a problem here, but now winter is coming and work less I go start with the amps again.

regards
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Old 22nd February 2018, 07:15 PM   #85
Sous is offline Sous  Ukraine
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Here are a few photos of the new versions of the amplifier
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File Type: jpg IMG_20180129_145520.jpg (726.8 KB, 149 views)
File Type: jpg IMG_20180129_145527.jpg (745.0 KB, 151 views)
File Type: jpg IMG_20180129_145540.jpg (560.3 KB, 148 views)
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Old 23rd February 2018, 12:35 AM   #86
Eva is offline Eva  Spain
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This is a good compendium of abilities at work.

The residual magnetic field from the inductor is picked up as a tiny square wave by signal traces and components. A close ground plane (as in 4+ layer PCB) attenuates that by 20~30dB. 5cm of distance has a similar 20~30dB attenuation effect (measured for the leakage field of a 25mm OD toroid core). A balanced modulator can increase rejection by 40dB. Flipping the spatial plane of a single axis-coil can provide over 40dB of attenuation (less for toroids as radiation is not single axis).

Why not an output inductor with the leakage field oriented in a spatial plane different to the plane of PCB in which modulator resides? This will certainly help with multi-channel application. Otherwise distance is the only solution for minimizing alterations in noise floor, in low volume operation, between modules.
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Old 26th February 2018, 02:10 PM   #87
Sous is offline Sous  Ukraine
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Now this revision of the printed circuit board is being finalized. The board is 4-layer.
Of course, differential circuitry is used.

Thank you for the concretization of the interference.
unfortunately, I had to reduce the size of the PCB which produced a deterioration in the parameters .But, nevertheless, THD + noise <0,002%.
At the moment it seems to me that the greatest level of interference is radiated by the midpoint of the FET, and precisely the charging currents of parasitic capacitances.

Since I use high-speed comparators it is also very important to use high-quality output filter capacitors. The presence of even 30nH of parasitic capacitor inductance is inadmissible. In fact, all high-capacity polypropylene capacitors can not be used

In short, there are many nuances.
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Old 27th February 2018, 07:13 PM   #88
kees52 is offline kees52  Netherlands
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Hi all experienced class d friends.

Sorry I do break in so suddenly with this question.

I have tryed to experiment somewhat with (bi-)unipolair modulator but get when I input a circuit into ltspice strange results, see picture. on the output bridge I get to much, and that give uge shoot through stuff.

output needs as in picture two, maybe I do have to offset the input sinusoidal signal? as say the example bookwork it is not. on the output comparators I get only positive signals, maybe wrong somparators. the sinousoidal is one inverted to comp input, use two comparators.

what I doing wrong. because is seems very simple but see not the fault, wel I do see it, I have 2 to much signals on output, and think the inputsignal needs offsets. thanks in advance.
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File Type: jpg class d AD modulation..jpg (278.1 KB, 74 views)
File Type: jpg Unipolar 4-Quadrant PWM Technique (Form II).jpg (69.8 KB, 70 views)
File Type: png Unipolar-PWM-signal-with-quarter-wave-symmetry.png (118.0 KB, 26 views)
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Old 28th February 2018, 09:36 AM   #89
kees52 is offline kees52  Netherlands
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I see why it is wrong, I get two to much signals, I need only the green or red ones, and not both, that gives shoot through.

This is maybe because of the input audio signals are not properly aligned?.
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