Exp3- Exponential Waveforms.pdf

# Exp3- Exponential Waveforms.pdf

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Exponential Waveforms Purpose: Observe the step response of circuits containing dynamic elements. Equipment Required: 1 - HP 54600B Oscilloscope 1 - HP 33120A Function Generator 1 - Protoboard 1 - Capacitance Meter (can be shared) 1 - 0.1- µ F capacitor 1 - 1-k resistor 1 - 0.47- µ F capacitor Prelab: Read Sections 8-1 to 8-3 in the text. * Assume the output resistance of the function generator (R TH in Fig. 1) is 50 . Do a CCA run on the circuit of Fig. 1. Use the transient analysis option and an 8 V PP square wave source with no DC offset. You will need to determine an appropriate source frequency so that the voltage across the capacitor reaches its final value before the source changes to the next voltage level. The results of the CCA should look similar to Fig. 2. Print out the CCA results and tape them into your lab journal. The equation describing the output v C (t) of the circuit of Fig. 1 is of the form: (1)

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Assume the function generator produces a square wave with a peak-to-peak voltage of 8 V, no DC offset (V avg = 0 V), and a period T O greater than 10T C . Under these circum- stances the initial condition IC and the final condition FC will be equal to the maximum and minimum voltages of the source. In this case, the assignment of +4 V or –4 V to the initial condition IC depends on whether the charging cycle or the discharging cycle are being observed, as shown in Fig. 2. For the discharging cycle the initial condition IC = +4 V and the final condition FC = -4 V. The opposite is true for the charging cycle, IC = -4 V and FC = +4 V.
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• Winter '19
• jihad daba
• CCA, Oscilloscope

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