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Ansoft Designer / Ansys Designer 在线帮助文档：

Smith Tool >
   Smith Tool Dialog >
       Display Tab >
           Mapping

Mapping

This group controls the relationship between the circuit’s source and load planes.

To map impedances at one plane to another:

1. Select a mapping function.

2. In the Gain (dB) box, type the desired gain at the known plane.

3. Click Apply:

— Circles corresponding to the specified gain in the known and target planes appear in the graph. If you have already plotted a gain circle for the specified value, the known-plane mapping circle will overlie it.

— Tracking markers on the known- and target-plane circles indicate points of correspondence between them. As you use your mouse to move the known-plane marker to various impedances on its circle, the target-plane marker tracks to indicate the target-plane impedance that produces the specified gain.

4. When you have moved the known-plane marker to the impedance you want to map, click to mark the source and load-plane impedances on the graph. The source and load-plane gain circles will remain on the graph.

Mismatch Mapping

Mismatch S→L and Mismatch L→S mapping functions allow you to explore the sensitivity of a network’s gain to the variations in source and load impedance.

• Mismatch S→L plots a load-mismatch circle.

• Mismatch L→S plots a source-mismatch circle.

• If you enter 0 in Mismatch or leave it blank, Smith Tool assumes a tolerance of 0 and displays a mismatch circle of zero radius.

• Terminating the network with an impedance within a Mismatch S→L circle, or exciting the network with a source having an impedance with a Mismatch L→S circle, will result in a gain in excess of Gain (dB)−|Mismatch| dB.

To implement mismatch mapping:

1. Select the desired response in the mapping response list.

2. In the Gain (dB) box, enter the target gain.

3. In the Mismatch box, enter the tolerable deviation from the target gain value, and then click Apply.

— Known-plane and target-plane circles appear; tracking markers on the circles indicate points of correspondence between them.

4. Click on the desired known-plane impedance to mark the target-plane impedance and plot a mismatch circle around it.

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