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All pass filter simulation question
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Topic: All pass filter simulation question (Read 473 times)
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lokajaudio
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All pass filter simulation question
«
on:
June 12, 2021, 12:42:15 pm »
Hello all, i am currently simulating this circuit is LTspice
here is link:
https://www.rfwireless-world.com/Terminology/All-Pass-Filter-basics-and-types.html
here is simulation, can someone guess or explain, why there is such a big peak at resonant frequency (all pass filter has flat gain response)? is it because of quality factor of filter (Q) ?
Thanks!
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Benta
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Re: All pass filter simulation question
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Reply #1 on:
June 12, 2021, 05:33:44 pm »
Because of R3 and R4. What on earth are they doing in your filter?
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lokajaudio
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Re: All pass filter simulation question
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Reply #2 on:
June 12, 2021, 07:17:49 pm »
So + of the amp should be grounded right?..
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Benta
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Re: All pass filter simulation question
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Reply #3 on:
June 12, 2021, 07:33:25 pm »
Yup. Just remove R3. You can choose R4=R2 to balance DC bias/offset for the amp.
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