1 consider the opamp circuit assume operation in the linear range let

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Question

(1)
Consider the OpAmp circuit.
Assume operation in the linear range. Let
Rout = 0 Ω and Rin = 00 Ω.
a)
Determine the Thevenin
equivalent for the input circuit
with Vsa and Vsb, i.e. values for
VTH and RTH. (4 pts.)
+
Vsa
Re
Re
Av
Vo
Rb
Ra
b) Determine the relationship vo in terms of vsa and Vsb. Solve with a finite
A and then let A go to infinity. (Hint: Note that V₁ = VTH. Solve for the
input and output in terms of vi and then eliminate Vi.) (4 pts.)
c) Calculate values of Ra and Rb for which vo
=
4(Vsa+Vsb). (4 pts.)
(2)
Consider the OpAmp circuit
shown. Each OpAmp has Rout = 0
and Rino 2. Assume operation in
the linear range.
a) Determine the relationship
Vo/vs. for the ideal case.
Ra
+
Vs
b) If Ra = Rb = Rc = Rd 3000 Q2 and vs =
=
Hint: consider two stages. (8 pts.)
(3)
Consider the OpAmp circuit shown.
Assume operation in the linear range. Let
R = 2000 2, Rout = 0, and Rin = 00 Q.
a)
b)
Draw the equivalent circuit
with a finite A. (2 pts)
If is = 3.0 mA and A is
infinite (ideal case), calculate
the output voltage vo. (3 pts.)
Avi
Rb
Av2
Vo
Rd
Re
5.00 V, calculate v₁ and Vo.
is
Av
R
Vo
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