5. A zero-order-hold circuit is often used to reconstruct a signal g(t) from its samples. (a) Find the unit impulse response of this circuit. Output Delay T 2----1-1 Input (b) Find the transfer function H(f) and sketch |H(f)| (c) Show that when a sampled signal ğ(t) is applied at the input of this circuit, the output is a staircase approximation of g(t). The sampling interval is T..