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HW4soln - PHYS3360/AEP3630 Electronic Circuits Spring 2011...

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PHYS3360/AEP3630 Electronic Circuits, Spring 2011, HW4 Solution 1 Negative Feedback Circuits Solutions 1. Save the plant. One possible solution is shown above. The other terminal of the lamp must to go 15 V and not ground because the light intensity is the same for either sign of the voltage on the lamp. The optional 𝐶 = 0.01 μF on 𝑣 𝑛𝑜𝑛 is to get rid of AC noise. Of course, there should also be bypass caps on the ±15 V power supplies. In practice the op-amp would need to be a high power amplifier to drive a load requiring more than about 20 mA, but the circuit would identical. With negative feedback 𝑣 𝑛𝑜𝑛 = 𝑣 𝑖𝑛𝑣 and 𝑣 𝑖𝑛𝑣 = 𝑣 𝑝ℎ𝑜𝑡𝑜 from the photocell. 𝑣 𝑛𝑜𝑛 is held at a constant voltage selected by the user. Note: the negative feedback loop in this case is closed not with direct electrical connection, but via the light bulb – photocell path.
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