Filters

Question 1

Describe how you can write the linear approximation of a Bode plot of a filter based on a frequency impulse response?

Answer 1

1. Simplify H to a product of fractions of the form (1/(1+ajomega)), 1+ajomega, constant values
2. Describe the Bode plot of each seperate element
   a) calculate |H|
   b) fill in |H| in the bode formula
   c) show its results for extreme cases of omega
3. Sum up all elements in one expression

Question 2

What is the bode formula?

Answer 2

20log_10(|H|)

that is also why product becomes a sum in bode plots