Question

Design a suitable second-order Bessel filter to attenuate the 50 Hz interfering signal to 1/2 LSB for the ATmega328 analog-to-digital converter. Assume that the unattenuated noise appears with an amplitude of 1 V.

If you wanted to achieve the same level of attenuation with just a simple passive (RC) filter, what value of capacitor would be required for a resistance R=100 kΩ. Determine the corner frequency.

Answer 1

Rc ditei Juc HE R=16 t L R S Ve V - 2. VE 9-211f R+ R R+ R (jue) jRCt 69RC 1 + Sides both Squaring On sec) ee (69RC) 2 YORC)E 14 -IN

19RC= (0R) toox to) 2 11x SDy LODX 10 18.37 X10 c 8-37 nF Catmer dregueny 27 RC 27 loDxlox .37 x10 -3.71 13