Experiment 3.pdf

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Experiment 2: Exponential Waveforms Purpose: Observe the step response of circuits containing dynamic elements. Equipment Required: • 1 - Oscilloscope • 1 - Function Generator • 1 - Protoboard • 1 - 1 k (ohm) 1/4W resistor • 1 - 0.1 μF capacitor • 1 - 0.47 μF capacitor Prelab: Assume the output resistance of the function generator ( 𝑅 𝑇𝐻 in Fig. 1) is 50 . Using a circuit analysis software, run the circuit of Fig. 1. Use the transient analysis option and an 8 𝑉 ?? 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 analysis should look similar to Fig. 2. Print out these results. The equation describing the output 𝑣 𝐶 (𝑡) of the circuit of Fig. 1 is of the form: 𝑣 𝐶 (𝑡) = (𝐼𝐶 − 𝐹𝐶)𝑒 −𝑡 𝑇 𝐶 + 𝐹𝐶 Assume the function generator produces a square wave with a peak-to-peak voltage of 8 V, no DC offset ( 𝑉 𝑎𝑣𝑔 = 0𝑉) , and a period 𝑇 ? greater than 10 𝑇 𝐶 . Under these circumstances 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
  • Oscilloscope

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