• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 46 subscribers
  • Views 287 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

A problem in implementing OPA657

ZHIGANG JI
Prodigy 10 points
Other Parts Discussed in Thread: OPA657

Hello everyone, I am really green in using op-amp. and recently i was asked to implement one circuit using opa657. i found even i use it as a simple adder, there is quite large noise (about 4V sometimes) when i scale to 5us/DIV in the oscilloscope. it seems i didn't use the opa657 correctly. can anyone give me some idea how to solve the noise problem?

  • 0
    TI__Genius 17905 points

    Hi,

    Can you please attach a schematic of the OPA657 circuit you are using and an oscilloscope capture with the noise you are seeing? Are you seeing this noise with no input signals? The OPA657 could be oscillating - the minimum recommended gain is +7V/V.