Wk11L2_Lab_10__Variable_Frequency_Response_with_PSPICE

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New Mexico State University *

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E-E-230

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Electrical Engineering

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Feb 20, 2024

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docx

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Preparation of the report: The report must be produced electronically using MS-WORD and submitted as a pdf file (e.g. use print to pdf). Tables showing data or results, figures and graphs should be produced electronically. Tables, figures, graphs and photos are to be embedded in the main body of the report. Include captions and titles for figures, graphs, tables and photos. Lab Safety: With proper procedures, the electrical lab is a perfectly safe place in which to work. There are some basic rules: No food or drink is allowed in lab at any time. Liquids are of particular danger as they are ordinarily conductive. While the circuitry used in the lab is normally of no shock hazard, spilling a bottle of water or soda onto such equipment could result in the experimenter receiving a shock. PSpice Components: We will introduce a new component in the simulator; independent sources. Variable Frequency AC Source: From the menu, click Place – PSpice Components to obtain the drop down, and click the Source-Voltage/Current Sources. Select the “AC”. Screen Capture 1 The two key parameters are: ACMag and AC Phase: ACMag – is the peak voltage/current for a sinusoidal function ACPhase – Allow for a phase shift to be defined for the source in degrees At this time, we use ACPhase equal zero
AC Sweep Frequency Analysis Simulation Profile: From the menu, click PSpice from the drop down, and click either New Simulation or Edit Simulation. A new window will open. Select the “Analysis” tab. Screen Capture 2 Ensure Analysis Type is selected as AC Sweep/Noise. From Options select General Settings. Select AC Sweep Type as Logarithmic: Decade We will focus on three parameters: Start Frequency, End Frequency and Points/Decade Start Frequency: -- This is the lowest frequency for which analysis will be performed. In our development of Bode Plots, we examined lower frequency responses with analysis of constants and at ω = 1. When performing logarithmic analysis, we do not use a value of zero. If other guidance is not provided, a frequency of 1 is a good starting point. End Frequency: -- This is the highest frequency for which analysis will be performed. If other guidance is not provided, a frequency at which the signal has drop more than 40 dB below the high value is a good starting point. Points/Decade – Using the Starting Frequency, End Frequency and Points/Decade, PSpice determines the total number of frequencies to analyze. It is recommended that no less than 10 points/decade be analyzed. It is preferred to use 20-50 points for most circuits.
Example Frequency Domain Plot: Screen Capture 3 Note the y-axis is a linear scale. Right click the axis to change to a log scale. Screen Capture 3 and 4
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Student: Antonio Luckett EEE 202 Laboratory Exercise 10: Variable Frequency Response Lab Report Date: Procedures Part 1: RC Circuit with Variable Frequency Sinusoidal Source 1. The input voltage V1 is a AC voltage with the follow parameters: a. Peak voltage of 1 V (ACMAG) b. Phase Shift Angle of 0˚ 2. Using the OrCad Cadence schematic, construct the circuit and place the probe. There are two sets of component values: Component: Value 1 Value 2 Resistor R1 500 Ω 500 Ω Resistor R2 1 kΩ 1 kΩ Resistor R3 1 kΩ 1 kΩ Capacitor C1 100 nF 10 μF Capacitor C2 10 μF 100 nF 3. Create a Bode plot for each component set. 4. Use the PSpice simulator, create a frequency domain plot for each set of components. 5. Show if analysis results consistent with the simulation. Provide screen shot of the schematic and the probe plot.
This lesson is adapted from Electronics by LibreTexts under a CC BY-NC-SA 3.0 license . Resulting lesson content by Rio Salado College under a CC BY-NC-SA 3.0 license .
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