TINA_Advanced_Topics.pdf

Vgen rgen 135k lgen 500m rin 47k e1 r1 1 c1a 3528u

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- + Vgen Rgen 1.35k Lgen 500m Rin 47k - + - + E1 R1 1 C1A 352.8u R1A 212.8m C1 3.53m VF1
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Output noise Input Noise
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Total Noise
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Network Analysis and S-parameters Network Analysis TINA helps you perform network analysis and determine the two-port parameters of networks (S, Z, Y, H). This is especially useful if you work with RF circuits. Results can be displayed in Smith, Polar, or other diagrams. The network analysis is carried out with the help of TINA’s network analyzer. The RF models of the circuit elements can be defined as SPICE sub-circuits (SPICE macros) which contain parasitic components (inductors, capacitors) or as an S-parameter model defined by its S (frequency) function. S functions are normally provided by the component manufacturers (based on their measurements) and can be downloaded from the Internet and inserted into TINA either manually or by using TINA's library manager. Let’s get started with an example. Open the circuit examples\rf\spar_tr.sch. This circuit consists of a network analyzer connected to an RF transistor. The first port of the network analyzer measures the base-emitter characteristic while the second port measures the collector-emitter characteristic of the transistor. If you double-click on the transistor, you will see that the actual characteristics of this transistor are defined by its S11, S12, S21, S22 parameters, and R1 and R2 input/output impedances.
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Each function is defined as a table of the S parameter and frequency. If you click on the … button beside the Complex label, you can see this table. You can easily add more points to the function with the Add new button or load an entirely new function with the Load button. Similarly, the Remove last button removes the last point, and the Clear all removes all the points from the list. The Arrange points button sorts all the points in ascending order of frequency. Note that TINA comes with many other models defined by S-parameters (under the RF toolbar). Close all the dialog boxes and run Analysis.AC analysis.Network analysis. Among many other parameters in the dialog, you can specify the frequency range and the mode (i.e., what to draw) of the analysis.
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The diagrams available depend on the selected analysis mode. In S Analysis, the Amplitude, Phase, Polar, or Smith diagram cans be drawn. Let’s select Analysis mode S, the Amplitude, Phase, Polar and Smith diagram types, and press OK. Four new pages are inserted into the diagram window. Each new page contains four curves, the S11, S12, S21, and S22 curves, displayed in the appropriate diagram style. You can obtain specific data values by placing a cursor on the desired points. When you place the cursor on a Smith curve, a special cursor diagram comes up, which can display the curve’s values in the format set with the Format and params (S-params, Z-params, etc.) fields.
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You can annotate these diagrams, as you can any other diagram types, by adding texts, circles, and lines.
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