• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 47 subscribers
  • Views 493 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.

OPAX170

Phillip Karls
Prodigy 250 points

Is there a plot of current noise density for the OPAX170? What is the input architecture (CMOS or Bipolar)? 

Thanks.

  • 0
    TI__Guru 63720 points

    Phillip,

    From the small magnitude of the input bias current (typical 8pA @25C), you may conclude that the OPAx170 is implemented on the high-voltage CMOS process.  Since the input current noise spectral density is a square function of the IB, it is extremely small (few fA/rt-Hz) - see below.  The increase in the current noise at f>10kHz is a direct result of the IB increase caused by input capacitance. 

     

  • 0 in reply to Marek Lis
    Prodigy 250 points

    Thanks Marek, I figured it was CMOS, usually TIs datasheets state it though.

    The graph is very helpful.