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BUF634A: Current noise model in Spice

Sariel Hodisan
Prodigy 145 points
Part Number: BUF634A

Hello,

Is the current noise of BUF634A modeled in the Spice model?

Thanks,

Sariel

  • 0
    Guru 48395 points

    Morning Sariel, 

    Yes, it looks like it is - there is no plot or spec in the PDS on current noise, but this simulated input noise current shows exactly the right flatband value for a 5uA input bias current (although that is a little suspect as the bipolar Ib spec suggests a class AB stage where the noise current is the RMS of two closely matched base currents) with a reasonable 1/f - the original 2000 model did not show a good In model. 

    Yes, that 5uA is the difference between two much higher Ib currents, so the modeled 1.2pA is probably way too low. Sorry, product group should provide a measured In plot along with the voltage noise over frequency.