LvW said:First of all, you should check the filter response with a simulation program.
How did you calculate the values for R and C ?
Your lowpass has a cutoff frequency of app. 5 Hz ! Is this your goal ?
seyyah said:I'm filtering a constant frequency signal which is at 100 kHz.
seyyah said:LvW said:First of all, you should check the filter response with a simulation program.
How did you calculate the values for R and C ?
Your lowpass has a cutoff frequency of app. 5 Hz ! Is this your goal ?
Cut-off freq is ok. Which program can characterize this circuit properly? Psspice? A simpel and free one would be better. What do you say for the output diodes because i realized in some circuits that when they turns on they cannot recover but a zener does.
Audioguru said:I have seen tutorials about active filters where they say the response of the opamp must exceed the response of the filter. They show a lowpass filter where the dropping response comes back up at high frequencies when the high frequency response of the opamp is not adequate.
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Audioguru said:If a faster opamp is used then the Sallen and Key lowpass filter will work fine at higher frequencies.
Why use the oldest and the slowest opamp to filter 100khz?
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