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Transcript
ECE 240 – Electrical Engineering Fundamentals PSPICE Tutorial 2 Determining Equivalent Resistance with PSPICE This tutorial presents a method for using PSPICE to verify the equivalent resistance of a circuit. It assumes that you have completed PSPICE Tutorial 1 and understand how to perform a basic DC Bias Analysis of a resistive circuit. In class, the equivalent resistance of the circuit shown in figure 1 was determined to be 10Ω. 51 101 71 41 31 121 71 Req Figure 1. Resistive Circuit By definition, if we apply a DC voltage source of value VDC to a resistive circuit as shown in figure 2, and measure the current leaving this source, IDC, the equivalent resistance of the circuit is: Req = VDC I DC IDC VDC + - Resistive Circuit Req Figure 2. Equivalent Resistance We can use the following procedure to determine the equivalent resistance of the circuit in figure 1 using PSPICE. 1. Enter the circuit shown in figure 3 into PSPICE. Note that a 1-volt DC source has been added to the input of the resistive circuit. Figure 3. PSPICE Version of Circuit 2. Run the DC bias analysis as described in PSPICE Tutorial #1. Display the current values on the circuit. The results shown in figure 4 should be obtained. Figure 4. Results of DC Bias Analysis 3. Note that the current leaving the 1V source is found to be 100mA. Thus, using the formula given above: Req = VDC 1 = = 10! I DC .1 4. The equivalent resistance can also be verified by constructing the equivalent circuit as shown in figure 5 below. Note that both 1V sources have the same current. This verifies that the 10Ω resistor in the bottom circuit is equivalent to the total resistance in the top circuit. Figure 5. Comparison of a Resistive Circuit with an Equivalent Resistance