MAE180+Laboratory+Project+4 - MAE180 Laboratory Project 4...

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MAE180 Laboratory Project 4 Strange elements in the negative feedback loop EXPERIMENT #1: power booster. DESCRIPTION An operational amplifier may not be able to provide the power required by large loads. A possible solution is using the op-amp to control a transistor, which in turn powers the load. By putting the transistor inside the negative feedback loop, the large open loop gain of the op-amp will try to ensure that the source voltage of the mosfet transistor is the value we expect it to be: if possible, the output of the op-amp, connected to the controlling terminal of the transistor (gate), will be whatever it needs to be to fulfill our op-amp “Golden Rules”. Wire the following non-inverter amplifier using an LF411 op-amp. The output voltage is proportional to the input voltage, and powers a 100 load (1 Watt resistor). Use the following “offseted” sinusoidal as input signal: Vi = 0.5 + 0.4sin(4 π t). Record the input and output voltages with the LabJack.
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  • Spring '09
  • Electronic amplifier, output voltage, vi, input voltage

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