© N. B. Dodge 01/12
Op Amp Worksheet
1. Operational amplifiers have several basic characteristics, including high
input impedance (~ 1 Mega Ω), low output impedance (typically < 500 Ω),
and a specific gain range. What is a typical gain of an op amp in common devices (you
may need to do some research)?
2. The gain of an amplifier is a measure of its ability to add power to a signal. Based
on information in the Lecture and/or Theory portion of lab, write down a simple
gain formula in terms of input signal and output voltage:
3. The formula you develop above gives the gain of the negative feedback amplifier,
allowing you to set the amount of gain that it will provide. Suppose you have two
inverting amplifiers with gains of ?1 = −10 and ?2 = −20, and you connect the
output of the first to the input of the second. What is the overall gain of this
“cascaded” set of two amplifiers? Is the result positive or negative? Is the output
from the second output in phase or out of phase with the original signal?
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