ADS_session4

ADS_session4 - S-Parameter Files List Plots and Parameter Sweeps Introduction ADS Session 4 The primary focus of this session is on working with

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ECE 5250/4250 ADS Session 4–1 S-Parameter Files, List Plots, and Parameter Sweeps Introduction The primary focus of this session is on working with S-parameter files of type *.SnP . This format was developed for one of the first PC-based microwave CAD programs, Touchstone ™. Along the way we will investigate the use of List Plots to display simu- lation results in tabular form. In the final section a filter/an ampli- fier cascade is simulated using commercial-off-the-shelve (COTS) S-parameter files downloaded from vendor Web Sites. This practical application is also coupled with the first use of parameter sweeps , a very powerful ADS capability. Parameter sweeping is available for use in (all?) ADS controllers. Agilent ADS Documentation/Tutorials Beyond the HTML help system available within ADS, there is a complete set of PDF-based documents contained within the ADS2009 install folder. This folder resides as the root level on PC installs. A screen capture showing the file names in the folder is shown below. • Note that the file cktsim.pdf contains detailed informa- tion on the .SnP file format ADS Session 4
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S-Parameter Files, List Plots, and Parameter Sweeps ADS Session 4–2 ECE 5250/4250 • The document adstour.pdf gives a nice overview of ADS projects and gives a brief description of each of the ADS controllers Working with .SnP Files • For linear circuit analysis, in particular AC and S-parameter modeling, the ability to import data sets of measured imped- ance, admittance, or S-parameters is very powerful filename.SnP specifically refers to an S-parameter data file by virtue of the fact that S denotes S-parameters; n denotes the number of ports, and P denotes port
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Working with .SnP Files ECE 5250/4250 ADS Session 4–3 • The ADS document cktsim.pdf explains that 1–99 port networks can be handled using .SnP files – This is also an excellent resource for understanding the various format available • In most cases you will not be involved with constructing these files • The format for one and two-port networks is slightly different from the three and four case, and then different again for • The files are composed of three entry types: – Option line: line begins with # – Data line – Comment line: line begins with ! • Here we will consider the format of just 1–4 port networks • On the option line you specify the actual S-parameter format to be one of three modes: RI = real and imaginary MA = magnitude and angle in degrees DB = magnitude in dB and angle in degrees S-Parameter 1-Port MA, RI, and DB File Formats: # frequency_unit S MA R impedance freq magS11 angS11 # frequency_unit S RI R impedance freq reS11 imS11 # frequency_unit S DB R impedance freq dbS11 angS11 n 5
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S-Parameter Files, List Plots, and Parameter Sweeps ADS Session 4–4 ECE 5250/4250 S-Parameter 2-Port MA, RI, and DB File Formats: # frequency_unit S MA R impedance freq magS11 angS11 magS21 angS21 magS12 angS12 magS22 angS22 # frequency_unit S RI R impedance
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This note was uploaded on 10/16/2010 for the course ECE 380 taught by Professor Baltazar during the Spring '10 term at Rice.

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ADS_session4 - S-Parameter Files List Plots and Parameter Sweeps Introduction ADS Session 4 The primary focus of this session is on working with

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