OPA837: Supply pin decoupling capacitors

Behnam Madadnia

Part Number: OPA837

Hello,

Normally for opamps supply voltages, it is suggested that there should be (100 nF + 2-10 uF) on the positive and negative supply pins. The second capacitor which is in range of uF should tantalum? or X7R is fine?

My second question would, should we always put another 100 nF, in between positive and negative supply pins? as in is in the schematic (C4)

over 1 year ago

0 Alec Saebeler over 1 year ago

TI__Mastermind 24529 points

Hello Behnam,

I found this article on decoupling capacitors for high speed op-amps: How (Not (ti.com). In general X7R and C0G capacitors are better for high speed applications, as ceramic capacitors tend to have a higher frequency 'self-resonance'. You should be alright with X7R, which is what we often use on TI EVMs for HSAMPs.

There is another resource here: decoupling resource

I provided resources to another thread on decoupling/bypassing between dual power supplies (split supply configuration): https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1355484/lmh6703-bypass-capacitor-between-vs-supplies

Best,

Alec

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OPA837: Supply pin decoupling capacitors