Myron Steinberg 1
- Joined Aug 1, 2019
- 12
(?) That's a long time to be working on the problem.
(?) That's a long time to be working on the problem.
So why did you ask the question about an analytical solution, since you apparently already know that?And I created many different filters including Butterworth 3rd order filters.
So why did you ask the question about an analytical solution, since you apparently already know that?
Where?Here is another possible circuit
Well actually the Vcc/2 lines all have to come from a divider anyway if this is to work off of a 24v supply only.MrAl,
This circuit has its +24V fed from a noisy switching power supply. In your new circuit you are feeding that noise directly into the inputs of the opamps.
My circuit had the Vcc/2 biasing filtered to remove the switching noise.
Oh, are you thinking that this lowpass filter circuit will not pass high frequency switching noise?
At the end of post #93. You dont see it?Where?
Here is another solution which doesnt required using unusual capacitor values...
[LATER]
I thought i should mention that if we change the 97k and 172k resistors slightly we can get a flatter response in the pass band, but we loose some sharpness in the cutoff region. We can also allow a little more overshoot (like maybe 5 percent) and get a sharper response.
I was able to get a flat response to within 0.1 percent but the response becomes somewhat less sharp. Allowing 3 percent overshoot the response sharpness is the same as the original circuit.
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