ADS_session2

ADS_session2 - Smith Chart, Custom Plotting, and TLine...

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ECE 5250/4250 ADS Session 2–1 Smith Chart, Custom Plotting, and TLine Transient Response Introduction In this second session we consider more details of ADS for spe- cific types of measurements. In particular we will address the needs of Problem Set #2, which reviews the Smith Chart, more transmission line frequency domain modeling, including lossy transmission lines, and transmission line transient analysis. ADS support for the above topics will have us explore the Smith Chart Utility , using equations and custom plot functions for plot windows, AC Simulation and the use of the Power Probe schematic component from the Probe Components pal- ette, and finally Transient Simulation and the use of the Sources-Time Domain palette. Smith Chart Utility • The Smith chart utility available in ADS is available under the Tools menu when a schematic window is open • When it is first opened the window appears with just a 50 Ω ADS Session 2
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Smith Chart, Custom Plotting, and TLine Transient Response ADS Session 2–2 ECE 5250/4250 source and load defined • One of the purposes of the utility is to aid you in the graphi- cal design of matching networks • Circuit elements placed between the source and load in the tool can then be placed in the schematic • Here we will only consider the utility as a stand-alone tool • Suppose we wish to model the following circuit: Z L 50 j 50 + = Z 0 50 = θβ l 90 ° == z 0 l Z in Γ L Γ in Γ L e j 2 θ =
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Smith Chart Utility ECE 5250/4250 ADS Session 2–3 • The Smith chart provides a graphical means to determine and/or for a given , , and – Clearly to obtain , all we are doing is rotating by degrees (counter clockwise) in the -plane – Other elements, such as series and shut inductors or capac- itors are also easily managed via the graphical capabilities of the Smith chart (and the Smith chart utility); here the - plane trajectories are along constant resistance or constant conductance circles, depending upon whether we have a series or shunt element (more on this when lumped ele- ment matching circuits are discussed) • Moving forward with the transmission line example, we change the load ZL to in the Smith Chart Utility • Next we pick a series transmission line element from the component palette with ZL selected, and then click on the Smith chart itself (this insures that the line section be placed in front of the load ZL , that is between the ZL and ZS) Z in Γ in Γ L Z 0 θ Γ in Γ L 2 θ Γ Γ Z L 50 j 50 + =
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Smith Chart, Custom Plotting, and TLine Transient Response ADS Session 2–4 ECE 5250/4250 – Note that you can drag the point you just clicked in the Smith chart constrained to a circle of constant , and it will adjust the line length as it constrains the locus of points on the Smith chart to represent a trajectory towards the generator –T h i s i s th e graphical-like action of the utility, similar to using a real Smith chart; what do you think?
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ADS_session2 - Smith Chart, Custom Plotting, and TLine...

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