Signal Integrity-Differential Pair Design 1 (Build A Differential Pair)

To simulate a differential pair, you must first establish a difference pair and set it. Then, extract the topology of the difference pair and perform simulation and analysis on it, according to the analysis results, the differential pair constraint is established and the differential pair wiring is performed. Finally, the differential pair is analyzed to check whether the wiring meets the design requirements. Instance: http://download.csdn.net/detail/wu20093346/7747837

Create a difference pair manually

(1) Start Allegro PCB Si GXL and open D: \ diffpair \ pci1.brd.

(2) execute logic-> assign differential pair. The assign Differential Pair dialog box is displayed:

Enter ring * in the net filter and press the tab key to display four networks:

Enter diffpair1 In the diff pair information column, click ringin_p in the net column, click ringin_n in the net column, and click Add. Then ringin_p and ringin_n are the member networks of diffring1. User Defined: Yes indicates that the specified differential pair has been created in the signoise model and a differential signal model has been assigned to the device.

Repeat the preceding steps to assign the difference pair diffring2 to ringout_n and ringout_p.

Close the assign Differential Pair dialog box and run file-> Save As to save it as the file D: \ diffpair \ pci2.brd.