• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 47 subscribers
  • Views 133 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.

TLV9054: Active Filter

JDJ
Expert 3801 points
Part Number: TLV9054

Can the TLV9054 create an active filter with the following parameters: 75kHz curry freq, 50kHz bandwidth. Gain 3dB. around -20dB at 160kHz? 

From initial calculation, it appears we will need two stages for the above filter requirements and the second stage would need a higher bandwidth (~11.6Mhz). Can you please confirm and let me know if there are any other key specifications to consider? 

Thanks,

  • 0
    TI__Mastermind 23870 points

    Hi JDJ,

    A second order filter would be required to attenuate the signal quickly enough (about -40dB/decade). 

    What kind of filter architecture are you looking at using? Also maybe using a dual device rather than two different singles would be better. 

    Best Regards, 

    Robert Clifton 

  • 0 in reply to Robert Clifton56
    TI__Expert 3801 points

    Hi Robert, we are open to any filter architecture that will meet the above filter requirements. 

    Please let me know your thoughts on recommendations and what op amp specifications are needed. 

    Regards,

  • 0 in reply to JDJ
    TI__Mastermind 23870 points

    Hi JDJ,

    I was mistaken. I think you will need to have about -60dB/decade attenuation, if I understand correctly. 

    We have a Webench Filter tool that can help you design the filter. That's where I got this screenshot to figure out how many orders of filtering I need to get the -20dB at 160kHz. 

    This actually means you need 3 stages of op amps to build this from what I've seen. 

    I encourage you to play around with the tool to see what works best for you. The parts the Webench tool recommend sometimes aren't the latest and greatest, but they will give you a good idea of the specs that you will need. If you need a three stage filter, a high speed amplifier might be required. 

    Best Regards,

    Robert Clifton