Op Amp Circuits
Today we learned several kinds of "building blocks" we can use with op amps.
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| We set out with the task of moving a square wave up above line y=0. We can use op amps to make a larger wave and connect -V to ground. That will cut off the negative side of the graph. |
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| V_in = V_out |
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| Standard inverting amplifier, with R_0 connected from the inverting input to the output, and R_1 connected to the input. |
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| Both of these are examples of non-inverting amplifiers. The input voltage goes into the non-inverting pin of the op amp. |
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| Summing Amplifier circuit |
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| Difference Amplifier Circuit |
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| In summary, we learned about inverting, non-inverting, summation, and difference amplifier circuits. |
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| Derivation of Sum amplifier circuit. |
Summing Amplifier
In this assignment, we implement a simple operational amplifier-based circuit. Since operational amplifiers are used commonly in circuits used to implement mathematical operations, we implement the processes of summing two voltages.
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| Prelab: We drew out the circuit and determined the resistances needed for R_1, R_2, and R_3 in order to make the 2 voltages add without saturation. We found those values to be R_1 = R_2 = 3.6kΩ and R_3 = 1.8kΩ. |
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| OP-27 summing circuit using Analog Discovery. Resistors from left to right are R_1, R_2 and R_3. |
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| We used the Waveform Generator on the Analog Discovery to vary the voltage, and we measured the output voltage of the amplifier compared to ground. We found an inverse relationship between input and output voltage, which makes sense because it is an inverting circuit. It also summed together the two voltages we had without saturation. |
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