(a)
(i) With the help of a suitable circuit diagram, define 'slew rate' for an operational
amplifier.
1
(ii) Figure Q.4(a) shows a basic comparator circuit with its transfer characteristic
(Vo vs Vi). Based on the figures, write the comparison of Vref to Vi, to produce
+Vo and -Vo.
+Vcc
Vi o
V
0
VO
+
ref
-Vcc
CC
V
+V
Osat
V
V
ref
-V
Osat
Figure Q.4(a)
(b) Applying the concept developed in Q.4(a) above, sketch the output waveform, vo, for
the circuit shown in Figure Q.4(b).
V
4V
2V
0
HANU
VI
-2V
-4V
UNIV
V2
SITI TEKNOLO
+12 V
V20
+
Vo
t
VO
Figure Q.4(b)
-12 V