Complete PCB Design Using OrCAD Capture and PCB Editor

Example 4. High-speed Digital Design

This example demonstrates how to stack up layers and design transmission lines for a high-speed digital PCB. The example also demonstrates how to create a moated ground area with a bridge around a high-frequency crystal oscillator, how to perform pin/gate swapping, and how to create a heat spreader using vias to the Ground plane. The example circuit is shown in Figure 9-156 .

Figure 9-156 High-speed digital circuit schematic.

The BOM for this example is shown in Table 9-8 . The circuit consists of a (fictional) high-speed, low-pin-count microcontroller/digital signal processor (uP-EXD10) driven by a 66-MHz clock ...