Unformatted text preview: Physics 300 Section 062
HomeWOrk Assignment # 7 Due at the beginning of the Tuesday October 24, 2006 lab. 1 State the Golden rules of Op—Amp operation. 2 Using arguments similarlto those used to derive equation 7.5 derive equation 7.6 in your
text. 3 What will the approximate voltage of the inverting input be if the noninverting input is
at ground for an op—amp in an inverting ampliﬁer circuit; 4 Using the data you obtained in section 7.2.1, make a graph of Vout versus Vin. On this
graph label the op—amp’s positive and negative saturation voltages as well as the input offset
voltage. Finally, using this graph show how you calculated the open loop gain of your opamp. 5 Op—amps have gains of 100,000 or more in many conﬁgurations. Using ﬁgure 7.3 this
problem will demonstrate to you all the steps that are needed to keep the inverting and
non—inverting inputs at nearly, although not identical, voltages. Assume the gain is 105 and
R1 and R2 are 1 k9 each. What output voltage would be needed to keep the inverting input
at 5V assuming that the voltage at the non—inverting input is 5V? If this were to happen,
then the output voltage would actually drop to zero since there is no difference in the input
voltages. The actual voltage at the output needs to be slightly less than the value you just
calculated. Using the gain of this ampliﬁer, determine what the output voltage needs to be to keep
the op—amp in a stable, steady—state condition. Make sure to carry your signiﬁcant ﬁgures
out to at least 10 digits as only a very small difference between the two inputs is needed to
generate a large enough output. 1
6a Can a noninverting op—amp of gain E be constructed using only 1 op—amp? Why Not? Design a non—inverting op—amp circuit with gain 5 using 2 op—amps. ...
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 Fall '06
 dejong
 Physics, Work

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