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Ansoft Designer / Ansys Designer 在线帮助文档：

Getting Started with Ansoft Designer >
Nexxim Design >
   Simple Channel Example >
       Create the Simple Channel with the Schematic Editor           

Create the Simple Channel with the Schematic Editor

Instead of opening the example on file, you can use Designer’s Schematic Editor to create the channel circuit for simulation. We shall create the following circuit.

The channel consists of a microstrip differential line and a pair of terminating resistors. The Eye Source on the left specifies the parameters of the input signal including transmitter properties such as transmit jitter and equalization. The Eye source can generate a bit stream for QuickEye or Transient analysis. The Eye Probe on the right captures the output and can add receiver equalization.

To create the design, follow these steps:

1. Start Designer. A new project, Projectn, should appear (n is the order in which the project was added to the current session of Designer).

2. If no project appears, create one. On the File menu, click New. A new project named Projectn is added to the project tree.

3. Select the project in the Project window. Right-click the project and select Rename from the menu. Our example has been renamed to SimpleChannel.

4. On the Project menu at the top of the Designer window, click Insert Circuit Design.

5. The Choose Technology dialog opens. Click None. The microstrip element in our design is a Nexxim Field Solver component, which generates its own substrate definition.

6. The Schematic Editor window opens with an empty design window.

7. Click the Components tab in the Project Manager window. Expand the Distributed folder by clicking on the “+” sign. Expand the Microstrip folder, and then the Coupled Lines folder:

8. Click on the MS_MCPL_DIFF: element, hold down the mouse key and drag the symbol into the design window. Press Enter to drop the symbol.

9. Right-click the microstrip element and select Properties. The Properties window opens:

10. Set the MOD property to Microstrip_MCPL_DIFF1. The MOD property allows the design to have multiple Field Solver elements with different substrate definitions.

11. Set W to 2mm, L to 254mm, GAP to 1.6mm, HU to 5mm, T1 and T2 both to 0.15mm, as shown above. Leave H, CONDUCTIVITY, ER, and TAND at their default values.

12. On the Components tab, expand the Independent Sources folder:

13. Click on the EYESOURCE_DIFF: element, hold down the mouse key and drag the symbol into the design window, at the left of the MS element. Press Enter to drop the symbol.

14. Right-click the Eye Source and select Properties. The Properties window opens:

15. By default, the Eye Source is set for a Unit Interval of 1ns, equivalent to a bit rate of 1 GHz/s. The rise and fall times are both 0.5ns.

16. Click on the BitPattern button. The Bit pattern data dialog opens:

17. Select Enter PRBS Data. Select 12 as the PRBS length and 1023 as the PRBS seed. This sets up a pseudorandom bit stream for QuickEye. Click OK to close the Bit pattern data dialog. The BitPattern button shows the PRBS setup.

18. Click OK to close the Eye Source Properties window.

19. On the Components tab, expand the Probes folder:

20. Click on the EYEPROBE_DIFF: element, hold down the mouse key and drag the symbol into the design window to the right of the MS element. Press Enter to drop the symbol.

21. Select the Eye Probe and press CTRL-R three times to rotate the symbol so that it is vertical with its positive terminal upward:

22. Right-click the Eye Probe and select Properties. The Properties window opens:

23. Set the Name property to OutputEye (or other unique name). This property allows for multiple Eye Probes.

24. Click OK to close the Eye Source Properties window.

25. On the Components panel, expand the Resistors folder. Select the RES_: element, drag and place two resistors at the right of the Eye Probe, lining up with the upper and lower terminals of the probe. The default resistance of 50 ohm should be fine for this circuit.

26. From the upper right of the Designer window, select a ground symbol and place it to the right of the lower resistor.

27. Left-click on the positive terminal of the Eye Source to start a wire operation. A big X appears and a wire is attached to the cursor. Drag the cursor with the wire to the positive (upper) input terminal of the MS transmission line. Click again to drop the wire. Connect the negative terminal of the source to the lower input of the MS transmission line.

28. Connect the positive (upper) output of the MS line to the positive terminal of the Eye Probe. Connect the lower output of the MS transmission line to the negative terminal of the Eye Probe.

29. Connect the upper terminal of the Eye Probe to the upper resistor. Connect the lower terminal of the Eye Probe to the lower resistor.

30. Connect the two resistor outputs to the ground symbol. The schematic should look like the example given at the beginning of the topic.

31. On the Designer File menu, click Save to save your project.

The next step is to set up and run Nexxim VerifEye and QuickEye analyses.

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