Identify any FOUR assumptions commonly made in the analysis of operational amplifier circuits, related to the ideal operational amplifier and briefly explain how each one can aid in circuit analysis.

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Question 5
a)
Identify any FOUR assumptions commonly made in the analysis
of operational amplifier circuits, related to the 'ideal
operational amplifier and briefly explain how each one can aid in
circuit analysis.
b)
Derive from first principles, appropriate expressions related to an
inverting amplifier circuit for: -
i)
Voltage Gain
ii)
Input impedance
c)
Figure Q5 shows a two-stage instrumentation circuit with two
inputs A and B, plus a single output VOUT.
R2
R1
U1
R3
RS
R4
U2
VOUT
Figure Q5
Redraw the circuit as a block diagram. (Allowed block types are
input, output, amplifier and summing junction.)
(P
Identify a general expression for the output voltage of the circuit
of Figure Q5 based on your block diagram from Part 5 c).
(Question 5 continues on the next page.)
(Question 5 continues below.)
e)
Find the output voltage, showing your method, if
A = 0.4 V, B = OV
ii)
A = 0V, B = 0.6 V
f)
State two potential limitations of this circuit related to
the supply DC voltage.
Comment on the maximum usable operating frequency of the
9)
circuit of Figure Q5 for small AC signals if the operational
amplifiers have a gain bandwidth product of 1 x 10°.
Transcribed Image Text:Question 5 a) Identify any FOUR assumptions commonly made in the analysis of operational amplifier circuits, related to the 'ideal operational amplifier and briefly explain how each one can aid in circuit analysis. b) Derive from first principles, appropriate expressions related to an inverting amplifier circuit for: - i) Voltage Gain ii) Input impedance c) Figure Q5 shows a two-stage instrumentation circuit with two inputs A and B, plus a single output VOUT. R2 R1 U1 R3 RS R4 U2 VOUT Figure Q5 Redraw the circuit as a block diagram. (Allowed block types are input, output, amplifier and summing junction.) (P Identify a general expression for the output voltage of the circuit of Figure Q5 based on your block diagram from Part 5 c). (Question 5 continues on the next page.) (Question 5 continues below.) e) Find the output voltage, showing your method, if A = 0.4 V, B = OV ii) A = 0V, B = 0.6 V f) State two potential limitations of this circuit related to the supply DC voltage. Comment on the maximum usable operating frequency of the 9) circuit of Figure Q5 for small AC signals if the operational amplifiers have a gain bandwidth product of 1 x 10°.
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