Consider the impulse sampler and first-order hold shown in Figure 3-66. Derive the transfer function of the first-order hold, assuming a unit-ramp function as the input x(t) to the sampler. x(t) бу **(r) v(c) First-order hold Figure 3-66 Impulse sampler and first- order hold y(t) A x(t)=t y(t) >+ 0 T 2T 3T 4T x(t)=(t-T)(t-T)+(t-1)