SSA Power Amp - drain output & CCS & parallel mosfets
Output peak voltage headroom is always welcomed, so stay on +/-50 V rails PSU and parallel the outputs. Same gender type of mosfets should be matched within +/-5 % to successfully split output power dissipation evenly among them.
Output peak voltage headroom is always welcomed, so stay on +/-50 V rails PSU and parallel the outputs. Same gender type of mosfets should be matched within +/-5 % to successfully split output power dissipation evenly among them.
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Hi LC,
Can you help me improve this ?
it's based on your vssa
QuasiSSA.asc
R5 / R55 are not necessarily a good solution...
thanks
Can you help me improve this ?
it's based on your vssa
An externally hosted image should be here but it was not working when we last tested it.
QuasiSSA.asc
R5 / R55 are not necessarily a good solution...
thanks
Last edited:
Simple and yet excellent DC coupled balanced circlotron. Ran the sim, looks very good. For the start implementing some familiar design improvements to get better THD at higher output levels, like enhanced VAS, driver stage, more parallel outputs, would do the job and make it stellar. Need some time to see what can be done.
I created a multithreaded application to run incremental ltspice batch simulations with as much parameter as desired and taking measurements to keep only the adapted ranges
It seems that the most suitable current for the VAS is 2.7mA with BC560C
409591 simulations and only 255 combination kept, 1h with my laptop (4thread)but only a few minutes with my dual xeon (32thread)
https://sites.google.com/site/solidcirclotron/BRUTE_FORCE.ods
It seems that the most suitable current for the VAS is 2.7mA with BC560C
409591 simulations and only 255 combination kept, 1h with my laptop (4thread)but only a few minutes with my dual xeon (32thread)
https://sites.google.com/site/solidcirclotron/BRUTE_FORCE.ods
Code:
"listeParam": [
{
"name": "PARAM_RA",
"value": 100,
"min": 100,
"max": 1000,
"inc": 10
},
{
"name": "PARAM_RB",
"value": 1000,
"min": 1000,
"max": 10000,
"inc": 2
}
],
"listeMeas": [
{
"code": "Ie(Q1)",
"min": 0.001,
"max": 0.016
},
{
"code": "Is(M3)",
"min": 0.2,
"max": 0.5
}
]
Last edited:
R5 / R55 are not necessarily a good solution...
They should go to the output source terminals.
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