D
[email protected]
- Jan 1, 1970
- 0
It's the first time that i use anti aliasing filter, so i have some
doubts:
1)My signal has infinite frequencies, but greater frequencies have
lower harmonics.Is it correct to put fs/2 (fs=sampling frequency of
ADC) at frequencies where dynamic range of fitered signal is equal or
greater than dr of adc? In this way, i can use frequencies lower than
frequencies where filter attenuation is equal or greater than dr of
adc.
2)About noise,what should i consider?I want that noise, at frequencies
greater than fs/2, has Vpp lower than lsb. But (if noise has gaussian
distribution) Vpp=6.6Vrms: in what frequency range i should calculate
Vrms?
3)About slew rate, i have found this link
http://www.edn.com/article/CA6339244.html?industryid=2281
but i don't understand how slew rate is calculated....how can i obtain
SR from SR=dV/dt|max?
Thanks for the help and for any suggestion
doubts:
1)My signal has infinite frequencies, but greater frequencies have
lower harmonics.Is it correct to put fs/2 (fs=sampling frequency of
ADC) at frequencies where dynamic range of fitered signal is equal or
greater than dr of adc? In this way, i can use frequencies lower than
frequencies where filter attenuation is equal or greater than dr of
adc.
2)About noise,what should i consider?I want that noise, at frequencies
greater than fs/2, has Vpp lower than lsb. But (if noise has gaussian
distribution) Vpp=6.6Vrms: in what frequency range i should calculate
Vrms?
3)About slew rate, i have found this link
http://www.edn.com/article/CA6339244.html?industryid=2281
but i don't understand how slew rate is calculated....how can i obtain
SR from SR=dV/dt|max?
Thanks for the help and for any suggestion