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Noise Bandwidth for BPF

Creative
Prodigy 20 points
Other Parts Discussed in Thread: TINA-TI

Hello,

How can i find the noise bandwidth for a Bandpass filter?

Thank you.

  • 0
    Guru 48395 points

    Do you have a BPF design, in a TINA file preferrably

  • 0 in reply to Michael Steffes
    Prodigy 20 points

    Thank you Micheal,

    No, because the opamp that i am using is LT6078 , this model does not exit in TINA-TI.  IN general how do I determine the Noise bandwidth for Band pass. I know how to find noise bandwidth for Low Pass filter.

    Thank you

  • 0 in reply to Creative
    Guru 48395 points

    Well the general definition is the same linear gain bandwidth that will integrate the same noise power as the actual filter. For a theoretical approach you would integrate the voltage gain squared of your response - personally, I would run a sim of the circuit for integrated output noise and solve from there. You would need an input noise source that dominates the filter terms extract that. 

  • 0 in reply to Michael Steffes
    Guru 48395 points

    Well using the LTC6078 implies an active filter of some shape, really just trying to get that shape simulating in TINA to put in a large input flat spot noise and run an integrated noise simulation to extract the actual NPB, 

    Here are some TI options if you wanted to pursue here - perhaps you should be asking LT for this help? It is odd that TINA V11 does not have this in its library,