Clearcly any noise will pass straight through to the adc


Clearcly, any noise will pass straight through to the ADC subsystem, introducing measurement error. You have two choices to mitigate this: SW filtering and HW filtering. Either way around, you need a HW anti-aliasing (low pass) filter following the output.
Assume the uC sample rate, Fs, is 100 Hz with 8 bit resolution.

1.what is the value of 1 LSB referred to 3 V ?

2.what is the maximum allowable (Nyquist) frequency FN your system can sample without aliasing ?

3.How much attenuation must your filter have in order to reject frequencies above Fs ? This annenuation is Amin (Hint: it is related to the value of 1 LSB)

4.what order must your filter be to achieve these goals if we pick Fo = Fs/4 (25 Hz) ? (-3db is Fo and your attenuation Amin occurs at Fs)

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Electrical Engineering: Clearcly any noise will pass straight through to the adc
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