Overview

NOTE: Use the Project Report Template

IN NO CASE may code or files be exchanged between students, and each student must answer the questions themselves and do their own plots, NO COPYING of any sort! Nevertheless, students are encouraged to collaborate in the lab session.

Part 1: Simulation

• S-parameter simulations
• Download the 7zap archive as follows:
• Download the 7zap archive RFcourse2015_proj2_wrk.7zap to your  ads directory
• Use MenuBar::File::Unarchive to extract the project into your ADS directory as follows

Fig. 001

• You should find a new directory RFcourse2015_proj2_wrk created in apps/ads
• Run ADS and open the new RFcourse2015_proj2_wrk workbook by double-clicking it
• We will be making S-parameter measurements that correspond to a situation similar to our project 2 simulation.
  
• Open the p2sparamLine schematic in the workbook by clicking that schematic design file.  

Fig. 002

• • Run the simulation, and you should S-parameters and Smith chart somewhat different from that illustrated below:
  

Fig. 003


Fig. 004

• Right-click and select "copy cell" to make a copy of this design
  
• Edit the new copy so that it reflects the scenario in the lab.   
  
• Change the transmission line to a TLIND component as shown above (blue arrow above),
• MenuBar::View::ComponentPaletts,
  
• then ComponentPallette::TlinesIdeal::TLIND (blue circle above)
  
• set TLIND 50 ohms impedance and delay=8 ns (blue arrow above),
• set source Term1 to 50 ohms,
•  and load Term2 to 50 ohms, and add a 50-ohm resistor in parallel to term2 to ground (magenta circle above). 
  
• Change the S-parameter sweep to go from 1 to 50 MHz in 1 MHz steps.  (yellow arrow above)
• Save a snapshot of your new schematic and paste it into your report.
  

• Run the simulation, and plot the Smith chart of S11 (somewhat different from that illustrated below):

Fig. 005

• Set two markers as above (one at 1 MHz and the other at where it crosses the axis on the right side (magenta arrow above)   
  
• What is the frequency where it crosses the axis on the right side?
• What are the two un-normalized impedances  (assume closest pure resistance) at the markers, and what is the transformer ratio (ratio of the 2 impedances)?
  

Report Data

• ============================    WARNING !!    ====================================
  
• **** WARNING **** YOU MUST USE THE PROJECT REPORT TEMPLATE Below:
• See the Project Report Template at bottom of this page
  
• A well-written report/paper is EXPECTED
  
• STRONGLY RECOMMEND that you read IEEE authorship series: How to Write for Technical Periodicals & Conferences
• Clearly describe everything, including:
• variables in block diagrams
• variables in formulas
• units of variables kHz, pF, nH, m, s,
  
• all traces on plots
• all curves on plots
• all results in any tables
  

• Minimum required data content for your report and demos
• Required theory/formulas numbered as below:
• (1) Reflection coefficient formula at port 1 at 1 MHz for 50-ohm source, 50-ohm line, and 25 ohm load
• (2) S11 formula at 1 MHz for 50-ohm source, 50-ohm line, and 25 ohm load 
• (3) Theoretical S21 at 1 MHz for 50-ohm source, 50-ohm line, and 25 ohm load. Hint: you must compute the power delivered to term2 delivered from the source (power into the 50-ohm resistor in parallel is not plotted as part of S21, only the power delivered to term 2 is plotted).  half of the power is delivered to each resistor since they have the same voltage and same resistance.
  
• Required figures:
• Any illegible plots receive zero credit (must be able to read all numbers, axes, labels, curves, grids, titles, legends)
• All plots must of professional quality as in IEEE papers
  
1.  LEGIBLE ADS schematic of the system (as in Fig. 004), with appropriate caption.
   
2.  LEGIBLE Smith-chart plot of simulated S11
3. LEGIBLE dB plot of simulated S21 and S11 on a dB scale from 0 to -10 dB
   
• Required tabular data content:
1. Table of s-parameters at 1 MHz (assume approximately dc) with 3 columns: parameter, theoretical value, simulated value
   
• Row 1: theoretical and simulated S11
  
• Row 2: theoretical and simulated S21
• Row 3: theoretical and simulated S12
  
• Row 4: theoretical and simulated S22
2. Table with 2 columns, parameter, theoretical value, and simulated value
   
• Row 1: frequency at which S11 crosses right side of Smith chart as in Fig. 005 above
• Row 2: un-normalized impedance (ohms) at the frequency at which S11 crosses right side of Smith chart as in Fig. 005 above

• See report template below
  

NOTE ReportTemplate: Use the Project Report Template 

  YOU MUST ADD CAPTIONS AND FIGURE NUMBERS TO ALL FIGURES!! 

Copyright © 2010-2019 T. Weldon

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