Optikon
New Member
All, I have a general question that I would like some comments/feedback on.
When considering operational amplifier circuits, it is very common to provide decoupling capacitors on the respective power supply pins.
Without getting into circuits/schematics (cause I dont have one to give), consider an amplifier circuit that is precision and VERY low bandwidth (like less than 1KHz down to DC)
What are good reasons that one should still provide (or not) decoupling capacitors on power supply pins?
There presumably are no high speed circuits operating in the amplifier so the usual use of decoupling caps to provide a local supply (decoupling from the far away/high impedance power supply) does not seem to apply. No fast changing currents, no large surges of current, so why have them at all?
Very often I see "blind" use of them on low bandwidth circuits. In practice, I have removed them with no noticable difference buit maybe I shouldn't?
Again, very slow, precision amplifier applications only - any thoughts on why or why not to keep decoupling caps on them?
Thanks!
When considering operational amplifier circuits, it is very common to provide decoupling capacitors on the respective power supply pins.
Without getting into circuits/schematics (cause I dont have one to give), consider an amplifier circuit that is precision and VERY low bandwidth (like less than 1KHz down to DC)
What are good reasons that one should still provide (or not) decoupling capacitors on power supply pins?
There presumably are no high speed circuits operating in the amplifier so the usual use of decoupling caps to provide a local supply (decoupling from the far away/high impedance power supply) does not seem to apply. No fast changing currents, no large surges of current, so why have them at all?
Very often I see "blind" use of them on low bandwidth circuits. In practice, I have removed them with no noticable difference buit maybe I shouldn't?
Again, very slow, precision amplifier applications only - any thoughts on why or why not to keep decoupling caps on them?
Thanks!