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Difference Amplifier (Subtractor) | Up
Neets Module 08-Introduction to Amplifiers | Next
Figure 3-27.—Circuit for Q31 through Q33 |
3-41
Now compute the voltage developed by R1 (ER1):
Compute the current through R1 (IR1):
Compute the voltage developed by R3 (ER3):
Add this voltage to the voltage at point A to compute the output voltage (Eout):
This was the output desired, so the circuit works as a difference amplifier.
Q-28.
What is the difference between a summing amplifier and an adder circuit?
Q-29.
Can a summing amplifier have more than two inputs?
Q-30.
What is a scaling amplifier?
Refer to figure 3-27 in answering Q31 through Q33.
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