Page 71 - Mechatronics with Experiments
P. 71
CLOSED LOOP CONTROL 57
1 sin(ω t/2)
S ω t/2 S
t
FIGURE 2.8: Impulse response of an ideal reconstruction D/A filter. Notice that it is a
non-causal filter.
u(kT) u(t)
Z.O.H
u(kT) u(t)
0 T 2T . . . t 0 T 2T . . . t
–sT u(t)
u(kT) 1– e
s
. . . -T 0 T . . . t . . . -T 0 T . . . t
FIGURE 2.9: Zero order hold (ZOH) type practical D/A converter, its operation and transfer
function.
