(Opamps are μA 741 units unless specified otherwise. μA 741 has
R
i
2 MΩ, R
o
75 Ω, v
io
2 mV, I
B
I
B–
100 nA, V
sat
10 V, current limit 20 mA and slew rate 0.5 V/μs.)
1.Design an Opamp circuit to produce v
o
(t) 3 7 sin200
π
tV
using 12 V power supply and a signal source
v
S
(t) 0.5sin200
π
t V.
2.Find i
L
, i
s
, i
o
and v
o
in the voltage to current converter in
Fig. 6.11-1 designed to produce a constant current in a 10 Ωload.
3.Repeat Problem 2 if R
1
R
2
R
3
R
4
120 Ω. (Hint: The
Opamp works in the current-limited mode.)
4.(i) Show that the current in the load resistance R
L
in the circuit
in Fig. 6.11-2 is independent of
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