Cir cuit s 212 Lab. Lab #7 Filter Design. Introductions:
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1 Cir cuit s 22 Lab Lab #7 Filter Design The purpose of this lab is multifold. This is a three-week experiment. You are required to design a High / Low Pass filter using the LM38 OP AMP. In this lab, you ll follow the process of building any system: The three major steps being:. Design 2. Simulation 3. Testing That is the broad overview of the three weeks of this lab. The aim of this experiment. To design a First Order Low Pass OR a High Pass Filter using an Op-Amp and a designated capacitor as the frequency determining component. 2. Build the low-pass or high-pass filter of your design and check its frequency response. Drive the circuit with a sine wave and record input (constant) and output voltage for different frequencies. Introductions: In this experiment you will design, build, and test the filters. The configurations you build are: Active Low Pass Filter / Active High Pass Filter For the configurations you will Design the filter for a specified Cut-off Frequency & Gain (your TA will designate cutoff frequency (between khz and 0 khz) and gain (5V/V, 0V/V or 5V/V) for each team) Simulate the design using PSpice. Layout the board using PCB Editor. Construct the circuit on the PCB Test and characterize the designed circuit. Frequency Response of Filters: The most common filters are:. Low Pass Filters (LPF) 2. High Pass Filters (HPF) 3. Band Pass Filters (BPF) 4. Band Reject Filters (also called Band Stop Filters BSF) You ll be building either an LPF or an HPF in this lab. The typical Frequency response of these filters is as shown below: Date Last Modified: 9/23/206 8:28 PM
2 Components Required for the Lab: These are your design constraints for this Lab: You are required to use the LM38 Operational Amplifier, and the 0.22uF capacitor as one of the two frequency determining components. All other resistor & capacitor values are determined by your design calculations, but you may only use standard value components in the EECS Shop. Standard Values will be discussed in the lab. Circuit Diagram: Your circuit configuration looks something like this: Low Pass Date Last Modified: 9/23/206 8:28 PM 2
3 HIGH PASS Note that the op-amp is used in its non-inverting mode (the input is connected to pin 3). The resistor-capacitor configuration between the input and the op-amp's non-inverting input provides the desired filtering. Procedure: Week :. Design a Filter for the given Cut-off Frequency and Gain. The Relevant Equations for both Low pass & High pass circuits are: Gain: = + R F / R G Cut off Frequency = / (2 π RC) Note: Use C = 0.22uF for the capacitor in the filter network. Select RF and RG between [k ] and 50 [k ]. If RF and RG are less than [k ] too much current will flow through the feedback loop, and the LM 38 will be damaged. If RF and RG are greater than 50 [k ] not enough current will flow through the feedback loop, and will invalidate some of the other practical assumptions of the LM 38. Date Last Modified: 9/23/206 8:28 PM 3
4 2. Simulate the circuit that you designed in PSpice. Use appropriate standard values of resistors. Be careful to only pick values available in the EECS shop. Determine the power supply filter capacitors by looking at the LM 38 datasheet on the lab website. Follow the steps below to create the circuit simulation. If you do not follow the steps below the simulation will work, but the circuit will not transfer to PCB Editor correctly. Making your schematic in Allegro Design Entry CIS to be Compatible with PCB Editor a. Create a new Analog or Mixed A/D blank project. b. Select and delete all libraries currently in the Libraries field. The only library left will be the Design Cache (because it may not be deleted), but do not use any of its parts. c. Add the libraries located in the following folder: P:\Cadence\SPB_6.3\tools\capture\library\pspice\EECS libs d. Create your schematic for simulation using the components in this folder. The recommended components are: Resistor R/ANALOG Capacitor C disc/analog OP Amp LM38 Date Last Modified: 9/23/206 8:28 PM 4
5 3. Bias the op-amp with a ±2 V supply. Apply an AC signal of Vpp to the Input. 4. Obtain the Frequency Response (the Bode Plot magnitude and phase) of the filter using PSpice. 5. After you have completed steps through 5 and you have been approved by your TA order your components from the EECS shop. YOU ARE REQUIRED TO SAVE A RECORD OF YOUR ORDERED PARTS LIST TO BE SUBMITTED IN THE LAB REPORT. Once you have ordered your components you may pick up the components next week before lab, or whenever the EECS shop has them finished (The EECS shop will probably not have your order finished the same day you submit the order). 6. Once the circuit has been analyzed using PSpice, the schematic must be modified for fabrication before proceeding to PCB Editor. Test Points need to be inserted at the input, output and at the two supply voltage pins. These test points allow a convenient point to attach probes for sources and test measurement. TPs are available in the connector library. Below is an illustration of using test points on an example circuit. **Note that the above circuit is just an example. ** Vac_+ V_DC_Supply _5Vdc_+ Vac 0Vdc 5Vdc V_DC_Supply _5Vdc_- Vac_- 7. After your simulation circuit has been modified with test points, create the PCB Layout using the LP/HP filter circuit you have already developed in PSpice. Refer to the Circuit Board Fabrication Tutorial for 22 Lab handout to create the PCB Layout of the circuit. This must be completed before the start of Week 2. Date Last Modified: 9/23/206 8:28 PM 5
6 Week 2:. Once trace routing is completed, print your circuit onto the Toner Transfer Paper (without the SST layer) and transfer it on to the circuit board using the fuser. ** **Note the board layout above is a depiction of the previous example circuit. 2. Etch the boards in the Sodium Persulphate tank to remove excess copper, leaving the desired traces. 3. Remove any excess toner left on traces and pads. Carefully drill holes wherever required. Use safety glasses when drilling. 4. You are advised, but not required to build your circuit on a breadboard before you solder your components, and test its characteristics. 5. If you finish Week 2 early you are highly advised to start Week 3. Week 3:. Solder the components on your PCB to build your circuit. 2. Apply an input sine wave of KHz, Vpp to the input and plot the output signal. 3. Measure the frequency response of the amplifier from 00 Hz to 00 khz by measuring the output amplitude for different frequencies of the input sine wave. Date Last Modified: 9/23/206 8:28 PM 6
7 Observations Table: Filter gain versus frequency Frequency [khz] Vin [V] Vout [V] Gain [V/V] Gain [db] = 20log0 Vout/Vin. Use your experimentally measured values to plot the magnitude of the Gain [db] (20 log ) of the frequency response (the Bode plot) with Excel. Plot the magnitude (on a linear scale) on the ordinate axis and frequency (on a log scale) on the abscissa axis. This is the magnitude portion of the Bode plot. 2. Use your experimentally measured values to plot the Gain [V/V] ( ) with Excel. Plot the magnitude (on a log scale) on the ordinate axis and frequency (on a log scale) on the abscissa axis. 3. Compare the plot of of your experimentally measured values to your PSpice simulation of of the circuit. Or, you may compare the plot of 20 log of your experimentally measured values to your PSpice simulation of 20 log. 4. You are required to include the following PSpice plots: a) (log scale) vs. frequency (log scale) b) 20 log (linear scale) vs. frequency (log scale) i. Consult Prelab 5 for how to plot 20 log in PSpice. 5. Determine the cut off frequency from the plot of 20 log (linear scale) vs. frequency (log scale) and compare it to the theoretical value. 6. Compare the actual and theoretical 20 Log ( + RF/RG) pass band gains. Date Last Modified: 9/23/206 8:28 PM 7
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