Routability Continued: Schematic Fundamentals and Traces
Introduction
In our previous lecture, we discussed the importance of routability in PCB design and the various factors that affect it. In this lecture, we will continue to explore the topic of routability, focusing on schematic fundamentals and traces.
Schematic Fundamentals
A schematic is a graphical representation of a circuit, showing the connections between components. A well-designed schematic is essential for ensuring the routability of a PCB. Here are some key considerations for schematic design:
- Component placement: Components should be placed in a logical and efficient manner, taking into account their function and connectivity.
- Net naming: Nets should be named clearly and consistently, making it easy to identify and connect components.
- Component values: Component values should be clearly labeled, making it easy to identify and verify the correct components.
Traces
Traces are the physical connections between components on a PCB. They are the “wires” that carry signals and power between components. Here are some key considerations for trace design:
- Trace width: The width of a trace determines its current-carrying capacity and impedance. Wider traces can carry more current, but may also increase the risk of crosstalk and noise.
- Trace spacing: The spacing between traces determines the risk of crosstalk and noise. Closer spacing can increase the risk of crosstalk, while wider spacing can reduce it.
- Trace length: The length of a trace determines its impedance and signal delay. Longer traces can increase signal delay and impedance, while shorter traces can reduce them.
Best Practices for Trace Design
Here are some best practices for trace design:
- Use a consistent trace width: Using a consistent trace width throughout the design can help to reduce errors and improve routability.
- Use a consistent trace spacing: Using a consistent trace spacing throughout the design can help to reduce crosstalk and noise.
- Minimize trace length: Minimizing trace length can help to reduce signal delay and impedance.
- Avoid sharp angles: Avoiding sharp angles in trace design can help to reduce the risk of crosstalk and noise.
Conclusion
In conclusion, schematic fundamentals and trace design are critical components of routability in PCB design. By following best practices for schematic design and trace design, designers can improve the routability of their PCBs and reduce the risk of errors and failures.
References
- Wevolver. (n.d.). PCB Trace: The Backbone of Modern Circuit Design. Retrieved from https://www.wevolver.com/article/trace-pcb-a-comprehensive-guide
- MokoTechnology. (n.d.). The Essential Guide to PCB Traces: Understanding the Basics. Retrieved from https://www.mokotechnology.com/pcb-traces/
- Rowsum. (n.d.). Transform Your PCB Design with These 31 Essential Routing Tips. Retrieved from https://www.rowsum.com/31-pcb-routing-tips/
- Proto-Electronics. (n.d.). Our Top 10 PCB Routing Tips. Retrieved from https://www.proto-electronics.com/blog/top-10-pcb-routing-tips
- Cadence. (n.d.). PCB Routing Essentials for the Modern Designer. Retrieved from https://resources.pcb.cadence.com/blog/pcb-routing-essentials-for-the-modern-designer