Issue link: https://iconnect007.uberflip.com/i/1536171
32 DESIGN007 MAGAZINE I JUNE 2025 2. Utilize the autorouter: Use it in a controlled manner to systematically complete all the routing as required. is is done by running a controlled burst of the autorouter in con- junction with Step 5; strategic pauses for review, trace(s) adjustments, and cleanup of work in process are key here. • Step 2 alternate: Start with Step 1 and then interactively route or interactive sketch routing for critical nets, sensitive digital, analog, RF, and high-speed differ- ential pairs. is alternate approach may be employed if the user doesn't trust the tool enough yet to turn full control over to the tool to route everything. Instead, the user controls and restricts the auto- mation of routing in small doses. is gives the user full control as he and or she sees fit. is is basically how I evolved from someone who only manually routed all signal traces to someone who utilizes the autorouter to my advantage when- ever possible. is saves me time and gives me the ability to adapt to changes faster and perform what-if scenarios. 3. Employ sketch routing for key areas (if alternate #2 option employed): e sketch router is ideal for guiding routes through complex zones (e.g., BGA fanouts, memory buses), giving you control with- out fully manual work. Many times, I have decided to simply use this specific step instead of just running the autorouter due to the need for more specific control on a particular dense and/or complex design. 4. Autoroute remaining nets (if alternate #2 option employed): Invoke the auto- router on low-priority or bulk digital nets (e.g., GPIO, control signals), where layout efficiency is more important than fine- tuned control. 5. Review and optimize: Leverage real-time DRC checks, signal integrity analyzer, and via minimization tools to refine the layout before tape-out. at's it. Final Thoughts I've come a long way with my use of the auto- router. Control and trust are key. Every design comes with its own unique set of challenges. I apply automated and/or semiautomated rout- ing approaches as much as possible. But every- one is different, and I respect their choices. Many still choose not to utilize the auto- router when routing signal traces in their PCB design, and that's fine. If they achieve success, good for them. But it will likely take more manual effort and a longer time to do so. If you think I'm blowing smoke, let me ask you: With your vast experience of PCB design knowl- edge and mastery of your respective tool, do you think you would win a design competition with regard to quality and speed of designing today's complex PCBs if you went head-to- head against another version of yourself who has mastered the autorouter? My answer is simple: I would blow away that manual version of myself by utilizing an auto- router. I believe many PCB designers would come to the same conclusion once they try out the latest autorouter technology. You will have to figure out what works best for you and what you are comfortable running with. DESIGN007 Stephen V. Chavez is principal technical product marketing manager with Siemens EDA and chair of PCEA.