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having a hard time finding....
having a hard time finding....
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Old 7th August 2007, 11:41 PM   #1
unclejed613 is offline unclejed613  United States
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Default having a hard time finding....

an externally compensated FET input op amp. i have an amp design i've been modelling, and most of the time it's unstable, and compensating the VAS has no effect. i finally figured out that it's most likely that the op amps i'm using in the model are internally compensated, so compensating "after the fact" won't have an effect.
i've done searches on ti.com, linear.com, and national.com with no results.
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Old 7th August 2007, 11:50 PM   #2
gootee is offline gootee  United States
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You could also look at analog.com; one of the best.

Maybe I don't understand what you mean when you say that compensating an internally-compensated opamp won't have an effect. They're usually just internally compensated to be stable with a gain as low as 1. But you can still also compensate them externally.

A few details of your circuit might help to expose some other problem, in case there is one.

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Old 8th August 2007, 03:30 AM   #3
djk is offline djk
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Use a slower opamp.

When using an opamp for the front end of a power amplifier, a slower opamp will give better stability when you close the loop around the power stage.

(can't remember if that came from Linear or Analog app notes).
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