10 consider the continuous time system with transfer functio

10. consider the continuous time system with transfer function H(s) = (s-1) / (s+1) (s^2 +2s+4). The corner frequencies for the bode plot are

a. 1, 1, 2

b. 1, -1, 4

c. 1, 0.5

d. 1, 1, 4

e. none of the above

Provide explanations so I understand it.

Option d is wrong

Answer is (a)

(s-1)in this corner frequency is 1 because we compare this to basic equation (1+jw/w_c)

S=jw so here w_c=1.... In this we take - ve as common which effect phase not magnitude

1/(s+1) same as above w_c =1

1/(s²+2s+4) in this natural frequency is cut off frequency which is 2...