Differential Amplifiers
INTRODUCTION
Discuss at least three very important characteristic of differential amplifiers.
What do the terms inverting and non-inverting mean in the context of amplifiers?
Calculate the ideal IT, IE, Vc for the differential amplifier shown in the diagram. Repeat the calculations using the second approximation. Show all work and record the final answers in the table.
EQUIPMENT
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PROCEDURE
Build the circuit in Multisim and measure IT, IE, Vc , record them in the table.
RESULTS
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IT
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IE
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VC
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Ideal
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2nd approx.
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Measured
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Compare calculations with the measured values.
What did you discover/confirm?
Include screen shots of the meter readings.
The table below shows readings for three different cases where the circuit above, was malfunctioning. Find the fault, assuming only one device in each case has a problem. List the steps taken to arrive at a solution.
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IC
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IE
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VC
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What is the problem?
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Case 1
Q1
Q2
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4.87mA
4.61mA
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4.89mA
4.64mA
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15V
10.4V
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Case 2
Q1
Q2
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7.49mA
0
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7.53mA
1.99mA
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7.51V
-695mV
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Case 3
Q1
Q2
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15pA
9.46mA
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0
9.52mA
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15V
5.54V
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CONCLUSION
What did you learn?