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Implement the design generated in B with LTSpice. 

Helpful guides for LTSpice can be found here.

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Run ]] ></ac:plain-text-link-body></ac:link></u>.</span></p><p style="margin-left: 40.0px;"><span style="letter-spacing: 0.0px;"><ac:image ac:height="150"><ri:attachment ri:filename="image2022-1-3_17-37-56.png" /></ac:image><ac:image ac:height="150"><ri:attachment ri:filename="image2022-1-3_18-7-33.png" /></ac:image></span></p><p style="margin-left: 40.0px;"><span style="letter-spacing: 0.0px;">Run AC simulation and plot the Bode <strong>Bode Plot of the output from each stagestage</strong>, cross check the measured cutoff frequency with the designed cutoff frequency from B. You . </span></p><p style="margin-left: 40.0px;"><span style="letter-spacing: 0.0px;">You may notice that the untuned filter circuit is not giving you what you expected, this is normal. This could be caused by various factors, you may put down your thoughts on this in your report. Adjust .&nbsp;</span></p><p style="margin-left: 40.0px;"><span>Adjust R values to match the design. (Refer to Lecture Notes 3 final page for cutoff tuning)

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</span></p><h2>C.2. FilterPro Simulation (Waveform)

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FilterPro provides "realistic" </h2><p style="margin-left: 40.0px;">FilterPro provides &quot;realistic&quot; simulation, once you've done tuning R in C.1., pass the recorded signal "sig.dat" through the LTSpice circuit&quot;<strong>sig.dat</strong>&quot; through the <strong>LTSpice circuit</strong>, observe and save the output waveform as "test.dat".

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Observe if distinguished HIGH and LOW with &quot;<strong>test.dat</strong>&quot;.</p><p style="margin-left: 40.0px;"><ac:image ac:height="115"><ri:attachment ri:filename="image2022-1-3_18-14-9.png" /></ac:image></p><p style="margin-left: 40.0px;">Observe if distinguished <strong>HIGH and LOW </strong>with minimum noise spike is shown in the output waveform. (E.g., blue waveform in the above figure)If </p><p style="margin-left: 40.0px;">If no, repeat C.1. or consider redesign from section B.If </p><p style="margin-left: 40.0px;">If yes, pass the output waveform from LTSpice to GNURadio, "<strong>GNURadio</strong>, &quot;test.dat" &quot; serves as input of "opamp&quot;<strong>opamp_file.grc"grc</strong>&quot;. Run and observe the PSR count.

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If .</p><p style="margin-left: 40.0px;"><ac:image><ri:attachment ri:filename="image2022-1-3_18-20-56.png" /></ac:image></p><p style="margin-left: 40.0px;">If you are satisfied with the PSR count at 1000 packet, you could move on to build the breadboard circuit now. If not, repeat C.1. or even redesign the filter. 

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&nbsp;</p><h2>D. Build and Test Breadboard

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Based Circuit</h2><p style="margin-left: 40.0px;"><span style="letter-spacing: 0.0px;">Based on your result of C.2., implement the circuit physically.

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Again. </span></p><p style="margin-left: 40.0px;"><span style="letter-spacing: 0.0px;"><ac:image ac:height="196"><ri:attachment ri:filename="image2022-1-3_18-23-37.png" /></ac:image></span></p><p style="margin-left: 40.0px;"><span style="letter-spacing: 0.0px;">Again, you may notice you are unable to duplicate the LTSpice design due to restricted choice of R and Cs, this means you need to do a measurement of the cutoff and tune the Rs again to match the desired cutoff.Make .</span></p><p style="margin-left: 40.0px;"><span style="letter-spacing: 0.0px;">Make full use of AD2 issued to you, Bode Plot, FTT, Waveform,... there are more than enough tools for you to debug your circuit. Refer to this page to help you solve some commonly seen issues over the past semesters. </span><span style="color: rgb(255,0,0);"><strong>(Please check this page for your queries before sending emails to the teaching team)

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</strong><br /></span></p><p><br /></p><ac:structured-macro ac:name="tip" ac:schema-version="1" ac:macro-id="7f9d102f-8317-4a1f-8954-0711548b3d42"><ac:parameter ac:name="title">Good Practices to follow for building / testing

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circuits</ac:parameter><ac:rich-text-body><ul><li>Make sure your laptop is connected to power supply, it helps provide sufficient power to your devices such as AD2.

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</li><li>Keep your wires neat and short.

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</li><li>Group the ground wires close together, as well as the power supplies.

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</li><li>Use capacitors to regulate positive and negative power supplies. <span style="color: rgb(255,0,0);">(See here for how to connect)

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</span></li><li>Plug in all legs/wires properly.

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</li><li>Trimmers (variable resistors) can be very sensitive, vibration during transportation could change their resistance. Do not press the the knob with fingers.</li></ul></ac:rich-text-body></ac:structured-macro>