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lab4_oscillators_procedure - ECE 327 Electronic Devices and...

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ECE 327: Electronic Devices and Circuits Laboratory I Procedure for Lab 4 (Oscillators Lab) SEE LAB BOOK procedure for information on what you need for your lab report . 1. In your book, see Figure 4.3: Op-Amp Relaxation Oscillator Build 1 kHz oscillator with LM741 (use ± 5 V supply rails) Set period T = 2 RC ln(3) for 1 kHz frequency (note: nano = 10 - 9 , pico = 10 - 12 ) * Keep C 100 pF to dominate parasitic capacitances and R 1 kΩ to reduce power draw View output and capacitor waveforms on same screen * ALIGN grounds and use 2 V / div on both channels Use Quick Meas to determine Period , Frequency , and Peak-to-Peak of output * Does the LM741 look like a “rail-to-rail” operational amplifier? – SAVE A PLOT showing OUTPUT and CAPACITOR waveforms and measurements Adjust time scale (i.e., time per division) to “zoom in” to see the slope of an an output “edge” Use Cursors to find slope of LINEAR PORTION of the “edge” – Give slope in V/μ s units and compare to expected (what is expected for an LM741 ?) – SAVE A PLOT showing sloped edge and Δ X and Δ Y from cursors (no capacitor) – HOW does the finite slope limit the fastest realizable frequency? Can RC be too small? * Decrease RC substantially to show how the apparent shape of the “square” wave changes * SAVE A PLOT of “trapezoidal” waveform. Show cursors’ Δ X and Δ Y of edge slope * Note that the edge slope is NOT changing. What is happening? What if RC 0?
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