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Hi,
I am trying to input Analog signal, filter it and output back.
I have a big falt.
I opend an example project "Filter_ADC_VDAC Example Project" and tried to simulate it
I am geting a very noisy and deformated outputs (pics attached)
1. for 100Hz
2, 1.9 Khz
When I am anning an example project I understanding that there is any problem? eror?
Do the DAC work with so terrible errors?
Maybe somebody tried it?
Thank
Piona
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I simplified the project, at least for me, by eliminating all the AC coupling and bias stuff.
Note the the output waveform is ~ 5 db down at the 1.9 Khz corner freq per the filter wizard
plot. You can gain upo the filter to take care of that if you wish.
Regards, Dana.
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I simplified the project, at least for me, by eliminating all the AC coupling and bias stuff.
Note the the output waveform is ~ 5 db down at the 1.9 Khz corner freq per the filter wizard
plot. You can gain upo the filter to take care of that if you wish.
Regards, Dana.
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Here is the same setup except WaveDAC81 generatinga square wave
and filter taking out harmonics, leaving the fundamental sine -
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Thanks Dana!
I just didnt understood why the filter makes sin from square vawe?
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Can you please remake the project cannot open it
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I made one like yours 🙂 work.
Do you know what makes the phase shifting?
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A square wave is an infinite series of odd harmonics of sinusoids. So
if we take out all the harmoincs but the fundamental, or just one harmonic,
any harmonic, we get a sinusoid.
In this case filter is taking out all harmonics starting with the first harmonic at 3.8 Khz.
So all that is left is a single sine, the fundamental sine, at 1.9 Khz.
We could have done this with BP filter also.
Here is a java example of changing the harmonic content of a squarewave - www.falstad.com/fourier/e-square.html
Regards, Dana.
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Re phase shift -
www.tedpavlic.com/teaching/osu/ece209/lab3_opamp_FO/lab3_opamp_FO_phase_shift.pdf
Regards, Dana.