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Old 15th June 2017, 07:05 PM   #1
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Join Date: Apr 2007
Default About my double pole vas amp


I've sim a double pole vas amp, the phase lead capacitor help to keep low the cap in the vas
and give a good slew rate.

Any suggestions or improvements for my double pole vas ?



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Old 16th June 2017, 08:44 AM   #2
jcx is offline jcx  United States
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Join Date: Feb 2003
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2 pole compensation allows high amounts of low frequency loop gain to be used in the global loop to correct "everything"

but a precondition is for the amp to actually have high open loop at low frequency - which your amp doesn't

triple output
lose the 50k VAS load R12
bootstrap VAS ccs may also limit gain
'beta enhanced' VAS and diff pair current mirror
actual diff pair tail ccs too if this is a noninverting amp

all the good things you'd find in Cordell's and Self's books
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