1. Frequency Response of Networks1.A. Pre-Lab Calculations1.B. Laboratory Procedure1. Frequency Response of NetworksECE 300 Lab 1Frequency Response of NetworksIn this lab we will calculate and measure the frequency response of the passive networks shown below:VinCircuit 1+--+Vo+C110n+R13900-+Vo+R13900Vin+C110n+-Circuit 2We will analyze this circuit three ways and compare all results. First we will find the magnitude of the transferfunction )(jVinVo by hand and then calculate the value of the function for several frequencies. Next, we willsimulate the response of the circuit using PSpice with an AC sweep. Lastly, we will measure the response of thecircuit in the lab at several different frequencies. All this data will be entered into an Excel spreadsheet andplotted.1.A. Pre-Lab CalculationsThe steps listed below must be completed for each circuit before you come to lab.1. Calculate the transfer function )(jVinVo. 2. Calculate the magnitude of the transfer function )(jVinVo.3. Evaluate the magnitude function from item 2 above for frequencies from 1 Hz to 100 kHz. 4. Simulate the circuit with PSpice using an AC analysis. You will need to use the part called VAC and set up an AC sweep from 1 Hz to 100 kHz. Make sure that you specify a logarithmic sweep in decades. An example circuit and setup is shown below:Sweep+-ACV1Magnitude = 1Phase = 0Vin0+C110n+R13900Vo15. Export the PSpice data to Excel and arrange the spreadsheet so that you can plot the calculated data from item 3, the PSpice data, and measured data on the same plot.1.B. Laboratory Procedure1. Wire circuit 1. Use a frequency generator as the input and use an oscilloscope to measure the waveforms. The diagram below may or may not help you. XFG1R13.9kohmC110nFA BTGXSC12. With channel A measure Vin. With channel B measure Vo. For each gain measurement,measure both the input and output waveforms because the amplitude of the signal generator's output may change with frequency.3. Measure Vin and ov for several frequencies and fill in Table Frequency Response of Networks-1. You should make a number of measurements near 4 kHz. Why?4. Using Excel, generate a plot of )(jVinVo versus frequency with the measured data, PSpice data, and calculated data. Plot all three curves on the same graph.Repeat the above procedure for Circuit 2 and record the measured data in Table Frequency Response of Networks-2.2Table Frequency Response of Networks-1: Measured data for Circuit 1Frequency(Hz) srVinovGain sovvGain inDecibelssovvLog102034Table Frequency Response of Networks-2: Measured data for Circuit 2Frequency(Hz) srVinovGain sovvGain
View Full Document
Unlocking...