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2stageEF high performance class AB power amp / 200W8R / 400W4R
2stageEF high performance class AB power amp / 200W8R / 400W4R
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Old 9th January 2019, 11:09 AM   #2811
mkc is offline mkc  Denmark
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Join Date: Jun 2002
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2stageEF high performance class AB power amp / 200W8R / 400W4R
Hi Toni,

Just for info. It seems that Kicad V5 supports ngspice. As far as I remember you don't use Kicad.

Cheers,
Mogens
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Old 9th January 2019, 11:15 AM   #2812
astx is offline astx  Austria
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2stageEF high performance class AB power amp / 200W8R / 400W4R
ngspice reads a spice compatible netlist. KiCAD, gEDA gschem, XCircuit and many other schematic frontends can produce ngspice compatible netlist for simulation. The automation scripts I wrote can be used also for KiCAD generated netlists ...


Have fun, Toni
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Old 9th January 2019, 11:33 AM   #2813
mkc is offline mkc  Denmark
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2stageEF high performance class AB power amp / 200W8R / 400W4R
Hi Toni,

Thanks for the heads-up. Although I use Kicad (preferred OS also linux). I have never used the spice facility. Still use LTSpice.

Will have to try it out at some point.

Cheers,
Mogens
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Old 9th January 2019, 11:55 AM   #2814
astx is offline astx  Austria
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2stageEF high performance class AB power amp / 200W8R / 400W4R
Dear Mogens,


yes you should definitely try it out. The simulation results are very similar to LTSpice results and the possibility to speed up the design process by running automated simulations is very promising.


BR, Toni
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Old 16th January 2019, 05:06 PM   #2815
astx is offline astx  Austria
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2stageEF high performance class AB power amp / 200W8R / 400W4R
Default ASTX LABS - SA2017 VMOS IXYS - Measurements

Just wondered how good the SA2017 IXYS module performs (VAS diode and overcurrent protection in situ) if bias is reduced to 100mA (+/- 42V regulated supply):

1W@8R:

THD+N 20k without bandwidth limit (!) 0.006%
THD+N 1k without bandwidth limit (!) 0.0051%

THD+N 20k with bw limit 80k 0.004%
THD+N 1k with bw limit 80k 0.0022%

Attached a picture with a GPIB-bus driven hardcopy of the distortion residual spectrum (ex VP7723D using HP3585A) and the measurement setup.

BR, Toni
Attached Images
File Type: jpg IMG_20190116_175114.jpg (496.1 KB, 73 views)
File Type: png sa2017_low_bias_1w_8r_20k_distortion_residual.png (6.6 KB, 77 views)
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Last edited by astx; 16th January 2019 at 05:12 PM.
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