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One of the Top Solid-State CFA amp design
One of the Top Solid-State CFA amp design
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Old 16th July 2018, 06:26 PM   #811
AndriyOL is offline AndriyOL  Ukraine
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Do you mean external series resistor 1R at output or input? And 8R dummy load with 47nF in parallel?
Perhaps better would be to perform these tests with new optimized pcb? Do you think the schematic is complete for new layout? The doubts left only in compensation values.
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Old 16th July 2018, 07:34 PM   #812
mjona is offline mjona  New Zealand
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External series resistor at the output and 8R in parallel with 47nF. You should try first a 50kHz square wave into the 8R dummy load alone with the amplifier as it stands with a range of low level input signals.
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Old 17th July 2018, 10:52 PM   #813
AndriyOL is offline AndriyOL  Ukraine
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I've made a layout for this sim file. I added 10R GND resistor as per original schematic. There are two gnd planes, at IPS section and as output zone. One thing I'm not sure with gnd planes, as this is not visible in the layout, is how opposite layer components go through these gnd planes.
Comments and offers are welcomed.
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File Type: jpg PCB.jpg (395.2 KB, 46 views)
Attached Files
File Type: asc SSAHP kplus siggen sim5C-R.asc (25.5 KB, 3 views)
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Last edited by AndriyOL; 17th July 2018 at 10:55 PM.
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Old Yesterday, 01:17 AM   #814
mjona is offline mjona  New Zealand
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Douglas Self made repeated comments earlier that a ground plane is not necessary.
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Old Yesterday, 04:56 AM   #815
kct is offline kct  Canada
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One of the Top Solid-State CFA amp design
Sadly, Douglas is very mistaken in his believe.
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Old Yesterday, 05:59 AM   #816
AndriyOL is offline AndriyOL  Ukraine
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I may believe that it can be true, but using gnd plane turns out with much compact and easier layout than if I route gnd tracks separately. It's beneficial in two points: simplicity and noise immunity.
In fact Douglas agreed as well gnd plane can be beneficial in post 115, as I understood.
Sorry, previous image was without GND plane, I thought I uploaded the correct one. Chris, please replace the image with this one. Thanks.
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Last edited by AndriyOL; Yesterday at 06:13 AM.
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Old Yesterday, 07:23 AM   #817
udok is offline udok  Austria
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Do you ever sleep :-)
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Old Yesterday, 07:30 AM   #818
AndriyOL is offline AndriyOL  Ukraine
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Of course)
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