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Ansoft Designer / Ansys Designer 在线帮助文档：

Smith Tool >
   A Smith Tool Example >
       Designing the Input Matching Network           


Designing the Input Matching Network

In terms of the Smith chart, the input matching network should provide a path from the point of tangency just described to the chart origin. To clarify the graph’s portrayal of this process, click the Clear button, and redisplay only 5 dB Noise and 14.8 dB Avail. Gain Ga (S-Plane) circles.

1. Start by displaying admittance grids and impedance grids simultaneously by clicking the Admittance button in the Display tab’s Grids group.

2. One way to match from the origin to the desired impedance (the point of tangency between the two circles, ZS=0.4−j0.2) is to follow a constant conductance circle down from the origin (equating to shunt capacitance) and then follow a constant resistance circle up (equating to series inductance) to ZS.

3. Put a constant-resistance circle through ZS. To do this, click the R button on the Grids menu, and then click the ZS point (0.4−j0.2) in the chart.

Note 

As another way to display this circle, type 0.4 into the Grids Value to Set box, and then click R.

4. Select the Matching tab, and then click New Match. The cursor moves to the center of the chart window, which corresponds to the chart origin if you have not changed the chart’s default zoom level. Click the mouse at the chart’s origin to fix the starting point of the match there.

5. Click the shunt capacitor icon and drag its adjustment box to the constant-R grid placed in Step 3. The resulting shunt-C value will be about 2.6 pF.

6. Click on the series inductance icon and drag its adjustment box to ZS. The resulting series-L value will be about 1.5 nH.

Your chart should look like this:

The input matching network is now complete. To generate its schematic, select the Matching tab, and then click Export. The new matching network is added to the SmithToolMatching project tree, and an unconnected two-port symbol for the network is placed in the upper left corner of the Amplifier schematic.



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