# MAE 60: Input Bias Current Lab (Gamero Castano) - Monday...

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Monday Lab 2-4pmMarch 10, 2014Week 9 Lab Report: Lab 5Experiment 1: Input Bias CurrentIntroduction/Purpose: Occasionally there is a very small and finite current that the inverting/non-inverting input sinks or sources.Materials: DAQ, Training Station, Capacitor (.001 uF), 1kohm resistor, LF411 Op-amp,oscilloscopeProcedure: Recreate the circuit in the manual, and use +/- 12V to charge the power the op-amp.Use a jumper as the switch and start recording when the switch is closed then open theswitch and observe the output voltage. Let the output increase it asymptotes to a constantvalue.Data/analysis:Problem 1.1: Plot the output as a function of time. The data should stretch a couple minutesDue to the interest of time we have cut our data short, we predict the output voltage willeventually reach -12V and will not drop any further.Problem 1.2: Derive the equation for the output voltage, Vo(t). Draw a sketch to define andrepresent the variables of your model. Why does the output voltage change over time? Why doesit change linearly with time?

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Term
Spring
Professor
N/A
Tags
Resistor, Voltage drop