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yet another op-amp bias question

Discussion in 'Electronic Basics' started by Anthony Fremont, Mar 7, 2006.

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  1. I posted a schematic over in ABSE along with a question. The jist of it is
    that I have a sallen key high pass filter (inverting) designed by FilterPro
    and I need to have the output biased at 1/2Vcc. The input is DC blocked by
    capacitors so no joy there. There is a resistor from the + input to ground
    and I don't want to mess up its function in the filter design, but I need to
    apply a bias voltage there so that the input doesn't get clipped.
  2. w2aew

    w2aew Guest

    Without seeing your schematic - here's a blind suggestion. If the
    value of the resistor to ground on the + input is critical to the
    transfer function, you can simply replace it with a voltage divider
    which: 1) sets the DC value you want, and 2) whose parallel combination
    gives the value of the original resistor.
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