Page 79 - Schaum's Outline of Theory and Problems of Electric Circuits

AMPLIFIERS AND OPERATIONAL AMPLIFIER CIRCUITS
68

Fig. 5-8 [CHAP. 5
t ¼ 5=12. Similarly, the op amp is in 5-V saturation from t ¼ 7=12 to 11/12 s. One full cycle of the output, given
in volts, from t ¼ 0to1 sis
8
< 5 1=12 < t < 5=12
v o ¼ 5 7=12 < t < 11=12
:
10 sin 2 t otherwise

Fig. 5-9

þ
EXAMPLE 5.7 Repeat Example 5.6 for v ¼ 25 mV and v ¼ 50 sin 2 t ðmV).
þ
6

v d ¼ v v ¼ð50 sin 2 tÞ10 6 25 10 6 ¼ 50 10 ðsin 2 t 1=2ÞðVÞ
When the op amp is within linear range, its output is
5
v o ¼ 10 v d ¼ 5ðsin 2 t 1=2ÞðVÞ
v o saturates at the 5-V level when 5ðsin 2 t 1=2Þ < 5, 7=12 < t < 11=12 (see Fig. 5-10). One cycle of v o ,in
volts, from t ¼ 0to1 sis