![]() ![]() A load has now been defined as R = 25 Ω, and L = 1 nh. 4ĥ Now the chart appears as shown at right. By touching the tab bar item labeled Chart, the impedance matching can begin. For this example, we ll assume the option to start at the source and work back towards the load has been selected, and therefore we ll elect to display the complex conjugate of the load. This may be found under the Preferences tab bar item. There is an option for the designer to either start at the source or load when performing a match. On the other hand, if the designer prefers to start at the load and work towards the source, then he or she will probably prefer to display the complex conjugate of the source. Generally speaking, it is appropriate to display the complex conjugate of the load when the designer is starting at the source and working back towards the load. There is an option to display or not display the complex conjugate of the load. ![]() Leaving the capacitor field blank results in a series RL circuit, as displayed below the entry fields. We ve entered values of 25 ohms for the series resistance, and 1 nh for the series inductor. Touching Series RLC Model, the screen changes to the figure displayed at right. ![]() For this example, we ll represent the load as a series RL network. It may be represented as a fixed Impedance, Admittance, or Reflection Coefficient (Z, Y or Γ) or it may be represented as a series or parallel RLC network. There are five options for setting the load. 3Ĥ The next step is to set the load parameters. For now, leave the design frequency set to 10 GHz. By touching Design Frequency the user may choose the design frequency, and it will automatically be reflected on the Chart page. Several items may be set on this page, including the Design Frequency, the Frequency Sweep Parameters, the System Characteristic Impedance (Z0), and various types of loads and sources (the user may scroll down to view more choices). Touch the tab bar item named Settings, to display the view shown to the left. 2ģ Normally, the first thing to do is to set the design frequency, which is initially set by default to 10 GHz. It will also be turned off automatically by setting the load, but unless turned off in Preferences, every time the user starts up a new design, it will show up again. This is shown at the beginning only to be helpful, and may be forever turned off by navigating to the Preferences tab bar item, then Display from the table that appears, and unchecking Opening Note to Define Load. A line of text is shown in blue, which reads, To begin a match, go to Settings and define the Load. This is the main display, where most of the design activity takes place. The tab bar items shown below the Smith chart are used to switch the active views to various displays, the one displayed presently being associated with the word Chart, and the icon of a Smith chart. Note however, that all of the toolbar items are inactive until a load is defined. Several icons are displayed in a toolbar above the Smith chart, and will be described as the example progresses. The design frequency, equal to 10 GHz, is displayed at the upper right of the chart, and the characteristic impedance of the system is equal to 50Ω. The Smith chart is displayed, with the source impedance represented by a circle in the center of the chart, and described on the screen to the lower left of the chart as a fixed impedance of 50 + j0.0 Ω. When the application 1Ģ starts up for the first time, the screen will look like it does in the illustration to the right. We ll start with an example, to see how easy it is to design and verify an impedance matching network. Editing may be performed on any matching element in the design, so that the effect of each component on the swept frequency response may be displayed. The user has the option of selecting fixed sources and loads, or may choose a frequency dependent model of the source or load to accurately represent a design over a wide frequency band. In addition, Smith Chart for ipad allows for the swept frequency response to be displayed at any stage of the design. Smith Chart for ipad features an interactive menu selection, allowing for a variety of matching elements to be selected one after another, with their cumulative response displayed immediately on the chart. It makes use of the intuitive design approach to impedance matching favored by users of the traditional paper Smith chart, but without the tedious calculations that often accompany a design. 1 Smith Chart for ipad 2.3 User Guide Getting Started Smith Chart for ipad is an interactive impedance matching tool for the iphone and ipod Touch. ![]()
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