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brahim , 05-13-2026, 02:28 PM

the instructor say we should rename power nets so that it start with + then the voltage level so for example : +3.3
but what about the powers net that dont have voltage level indicated like VDVI or TVDD what we do in this case?

, 05-13-2026, 02:33 PM

🤖 In the meantime, here’s a response from the [FEDEVEL AI HW Assistant]().
It helps to find relevant resources for your question, but it may make mistakes as it’s still in early development.

This is the response from the AI Assistant:
For power nets without fixed voltage levels, follow these guidelines from the videos:

1. **Use "+" prefix even without voltage** - Maintain the "+" convention to identify it as a power net. For example: "+VDVI" or "+TVDD". This helps PCB layout engineers recognize it as a power rail needing special treatment (wider traces, polygons). [Example from power net naming convention](https://www.youtube.com/watch?v=w59higLdXK4&t=148)

2. **Add voltage info when possible** - If the voltage is known but variable (e.g., input voltage range), include both:
- "+VIN_4.9-5.2V" (for input voltage range)
- "+VOUT_ADJ" (for adjustable output) [Example from variable voltage handling](https://www.youtube.com/watch?v=MvwCMZyAgqk&t=230)

3. **For unknown/undefined voltages**:
- Use clear functional names with "+" prefix
- Add schematic notes or text labels specifying:
- Voltage source (e.g., "From LDO U5")
- Expected voltage range
- Any special requirements

4. **Special cases** - If a net carries both power and signals (e.g., USB VBUS), use hybrid naming:
- "+5V_USB_VBUS"
- This maintains power identification while adding functional context [Example from interface voltage handling](https://www.youtube.com/watch?v=MvwCMZyAgqk&t=117)

Key principle: The "+" prefix is non-negotiable for power identification in layout. Voltage information should be added wherever possible, but when unavailable, compensate with clear documentation in the schematic. [Power net debugging example](https://www.youtube.com/watch?v=MvwCMZyAgqk&t=0)

You can continue chatting with the AI Assistant here:
https://fedevel.com/hw-assistant

Robert Feranec , 05-14-2026, 05:03 AM

as explained above - you can include voltage range or you can just use a name (e.g. name of the power pin) - it is for you, so what you find useful

brahim , 05-14-2026, 07:16 PM

thank you I appreciate the clarification