Electronics > Projects, Designs, and Technical Stuff
2nd Order low pass filter - Why a topology?
iMo:
Except the freq responses, impedance matching, etc., plz consider your requirement 0-10V DC cannot be maintained by single rail opamp, imho.
For "DC accurate" low pass filters choppers are used..
BartK:
--- Quote from: imo on May 07, 2019, 09:47:56 am ---Except the freq responses, impedance matching, etc., plz consider your requirement 0-10V DC cannot be maintained by single rail opamp, imho.
For "DC accurate" low pass filters choppers are used..
--- End quote ---
Why not? My prototype works very well, which trap do you foresee?
iMo:
Which opapm do you use in your prototype?
BartK:
--- Quote from: imo on May 07, 2019, 10:05:40 am ---Which opapm do you use in your prototype?
--- End quote ---
I use the NCS20074DR2G Rail-to-Rail OpAmp.
Farnell: https://uk.farnell.com/on-semiconductor/ncs20074dr2g/op-amp-quad-3mhz-2-8v-us-soic/dp/2774608
Datasheet: http://www.farnell.com/datasheets/2337856.pdf?_ga=2.49050722.573137400.1557223578-350974861.1556633241
iMo:
The output does not go to 0V in single rail Vcc.
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