Download Homework set no 3 - Department of Applied Engineering

California University of Pennsylvania
Department of Applied Engineering & Technology
Electrical/ Computer Engineering Technology
EET 215: Intro. To Instrumentation
Homework Set No. 3
Due date: 10/05/2011
Individual work
Name:
Signature and date:
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Learning Outcomes:
A-
To demonstrate the ability to solve and design OP-AMP comparator circuits
B-
To demonstrate the ability to solve and design inverting and noninverting amplifier circuits.
Questions:
For all circuits, assume the following:
a±Vsupply = ±15𝑉
b741 op-amp is used
cAOL = 200,000
dVd = V+ - VA123-
Comparators
Name the five basic terminals of an op-amp
Draw the op-amp electronic symbol and label its five basic terminals
What do the following symbols stand for?
SMT, DIP, PIN
4-
The part no. LM741C, what does LM stand for?
5-
What does the C stand for in No. 4?
6-
Write the equation describing the output when an op-amp is used as a comparator. ( in terms
of AOL, and Vd
7-
Determine Vo for:
a)
b)
c)
8-
V+ = 2.00V, V- = 1.998V
V+ = 1.996V, V- = 2.000V
V+ = 2.00V, V- = 1.999998V
In the circuit shown, sketch Vin and Vo vs. time and Vo vs. Vin
Vo
+
Vin
LM741CN
10kΩ
-
Vin is a 2Vpk sine wave at 100Hz.
9-
In the circuit shown, sketch Vin and Vo vs. time and Vo vs. Vin
Vo
Vin
+
1V
LM741CN
10kΩ
-
10-
B-
Design a noninverting voltage level detector to have VUT = 6V and VLT = 2V and:
a- Draw the circuit with the component values shown
b- Determine the hysteresis voltage (VH)
c- Sketch Vin and Vo vs. time if Vin is a 9V pk triangular waveform at a frequency of 100 Hz.
Inverting and noninverting amplifier
1Design an inverting amplifier to have a voltage gain of -15. Draw the circuit and show
component values
2Assume an inverting amplifier with Rf = 100KΩ, Ri = 25KΩ, RL (load resistance) of 10KΩ and
aVin = 2V
bVin = 2V
Calculate Iout and Vout.
3Sketch Vin and Vo vs. time in the circuit shown. Assume Vin is a 3Vpk triangular waveform at
100 Hz.
40kΩ
20kΩ
1.5 V
10kΩ
Vo
+
Vin
LM741CN
10kΩ
4Design an inverting adder so that Vo= -5(V1 + V2 + V3 +V4). Where V1 , V2 , V3 and V4 are
arbitrary inputs.
5What is the input impedance in problem B-1 ?
6Design a noninverting amplifier to have a voltage gain of 15. Draw the circuit and show
component values
7Assume a noninverting amplifier with Rf = 100KΩ, Ri = 25KΩ, RL (load resistance) of 10KΩ and
aVin = 2V
bVin = 2V
Calculate Iout and Vout.
8Sketch Vin and Vo vs. time in the circuit shown. Assume Vin is a 4Vpk triangular waveform at
100 Hz.
20kΩ
10kΩ
Vo
+
1.5 V
LM741CN
Vin
10kΩ
-
91011-
Draw a voltage follower (buffer) circuit
What is the advantage of a voltage follower?
Calculate Vo in the circuit shown.
20kΩ
10kΩ
1.2 V
20Ω
Vo
+
2V
LM741CN
10kΩ
10kΩ
-
10kΩ
1V
1.5 V
12: Design a noninverting adder so that Vo= 5(V1 + V2 + V3 ). Where V1 , V2 and V3 are arbitrary inputs.
13-
Refer to the circuit below:
40kΩ
10kΩ
Vo
+
2V
LM741CN
Vin
10kΩ
-
Assume Vin is a 3 Vpk triangular waveform at 100Hz.
What is the maximum dc input value before the output saturates ?
14abc-
In an ideal op-amp, what are the ideal values of the following:
input biasing currents (Ib-, Ib+)
the input impedance
the output impedance
1515-
What is meant by “virtual ground” in op-amp circuits?
What is the input impedance in problem B-6 ?