Posted: February 17th, 2017

Explain in a few sentences how the rectifier works and why you chose that configuration. 10 Points.

  • Input: AC voltage source of 8V peak at 60 Hz. Use “Vin ? ? sin(0 8 60 0 0)” in your netlist, with the question marks replaced by your node names.
  • Output: Average of at least 5V DC with a peak-to-peak output ripple of less than 300mV.
  • Load: 100 ohm resistor

 

Rectifier

For the rectifier portion, you are allowed to use any of the circuits in the book (half-wave, full-wave, bridge). However, you are only allowed to use diodes. For the diode model, use the D1N4148 model from the “sedra_lib.lib” file, which I have copied below. Please put this directly in your file so it simulates without any external files:

Filter

For the filter you are allowed the following components:

 

Your goal is to minimize the ripple of the output voltage, but the average value of the output must stay above 5V. The output can dip below 5V but the average must stay above 5V. To run your circuit use the following analysis command:
.tran 100us 300ms 200ms 100us
This will skip 200ms so that the output can stabilize. If you want to see what the circuit does as soon as you apply power, then change the 200ms to 0.

 

 

Report

The report format and grade breakdown is as follows:

  • Cover Page: 5 Points
  • SPICE netlist of the final circuit (attach to back of report), including the model statement for the diode: 15 Points.
  • Screenshot of the schematic of the final circuit: 15 points
    • All elements labeled: 5 Points
    • All values given: 5 Points
    • All nodes labeled as in your Spice Netlist: 5 Points
  • Graph of the voltages at the source, output of rectifier proper, and output of filter (at load) with labels: 10 points
    • Voltage at source: 3 Points
    • Output of the rectifier: 3 Points
    • Output of filter (at load): 4 Points
  • Performance Analysis:
    • Is the average output voltage greater than 5V? 15 Points
      To measure this I will have LTSpice give me the average of your output waveform (Ctrl-Click on header in graph). If the value is less than 5V you will lose points proportionately.
    • Is the peak-to-peak output ripple less than 300mV? 15 Points
      To measure this I will use the cursors in LTSpice to get the voltage between the peak and trough of your waveform. If the value is greater than 300mV you will lose points proportionately.
      If you get the output ripple below 270mV while maintaining the output voltage above 5V, you get 10 bonus points.
  • Conclusion:
    • Explain in a few sentences how the rectifier works and why you chose that configuration. 10 Points.
      If the explanation is incomplete then you will be awarded only partial points based on the explanation provided.
    • Explain how you designed the filter. The better your explanation, the more points you will get. 15 Points

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