A closed-loop system has the characteristic equation given by: s3+ks2+(k+2)s+3=0 s^3 + k s^2 + (k+2) s + 3 = 0 s3+ks2+(k+2)s+3=0. For the system to be stable, the value of k k k is:
A digital filter with impulse response h[n]=2nu[n] h[n] = 2^n u[n] h[n]=2nu[n] will have a transfer function with a region of convergence.