Class Note
Nodal analysis and we all know at inverting voltage amplifier the node at (-) & (+) is 0
Key point at star ~!!
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Inverting Voltage Amplifier
In this lab we were required to build an inverting voltage amplifier using an op-amp
We then asked to calculate the theoretical voltage gain and the phase shift.
In this lab we were using R=10k C=10nF sinusoidal signal amplitude 2V and offset 0V with
frequency: 100 Hz, 1kHz, and 5kHz
100Hz Vin 2.01 Vout 1.704
1kHz Vin 2.01 Vout 0.312
5kHz Vin 2.01 Vout 0.312
We calculate the Amp gain By Vout/ Vin
Phase Shift by Delta T / T(period) * 360
The result of this lab is frequency increase will decrease the Amp gain because Vout decrease as frequency increase.
Unlike the Amp gain, the phase shift is increase when frequency increase but quickly reach a shift of maximum.
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Setup of Circuit
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Our next lab required us to build an op-amp relaxation oscillator and manipulate the resistance to obtain a frequency of 178
we use digit number 155 and observe 178
We then calculate period then plug into the formula theat period = 2RCln[(1+B)/(1-B)]
then we assume R1=R2=1k ohm
Then we solved R = 29428 ohm
Second Lab set up
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