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WEBENCH® Design Center

Welcome to the WEBENCH® Design Center Section of the TI E2E Support Community. Ask questions, share knowledge, explore ideas, and help solve problems with fellow engineers. To post a question, click on the forum tab then "New Post".

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MFB
  • active filter designer
  • Filterpro
  • FilterPro 3
  • FilterPro Problem
  • gain bandwidth
  • HPF
  • OPA4820
  • Sallen-Key
Related Posts
  • Forum Post: Re: Multiple feedback filter not matching filterpro design recommendation - please help.

    Rick Downs - WEBENCH Design Center Rick Downs - WEBENCH Design Center
    Edward, The problem is likely parasitics working in tandem with the large feedback resistor values. As noted in the OPA4820 datasheet, the part really doesn't like impedances around it higher than a couple of kΩs - because at higher values, the parasitics really start to affect the bandwidth...
    on May 10, 2010
  • Forum Post: Re: resistor value and other question

    Rick Downs - WEBENCH Design Center Rick Downs - WEBENCH Design Center
    Koray, When FilterPro first does a design, it uses exact resistor values (0%) - you can then change this by using the controls at the top right of the schematic screen: You can set both resistor and capacitor tolerances, and FilterPro will find the nearest standard value to match your design...
    on Oct 27, 2010
  • Forum Post: Re: Differential amplifier - allpass filter doable?

    Rick Downs - WEBENCH Design Center Rick Downs - WEBENCH Design Center
    Can't say that I've ever tried this with an allpass filter, but this article describes how to transform any single-ended MFB design into a fully-differential one. Might be worth pursuing - take the design from FilterPro and use the procedure described in the article to make it fully differential...
    on Nov 30, 2010
  • Forum Post: Arbitrary topology for each filter stage in FilterPro.

    Stanislaw Leschinsky Stanislaw Leschinsky
    Good day, ladies and gentlemens. Can I arbitrary select topology for each filter stage in FilterPro 3.1.0.23446 and how I do this? F.e. Sallen-Key for first stage and MFB for second stage of 4-th order LPF. Thank you for advise.
    on May 2, 2012
  • Forum Post: Incorrect Q value in HPF?

    matthew fortin matthew fortin
    In the FilterPro Desktop version, I am designing a 3rd order Chebyshev 0.5dB 135kHz High Pass Filter with a stopband freq of 10kHz. For the first stage, it lists a Q = 0.5. Doesn't Q=0.5 mean 2 repeated real poles at Fo? Is this mistake or is there a reasoning behind this? Shouldn't this stage...
    on Sep 13, 2012
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