---
# System prepended metadata

title: 'TechReport: Research about USB as Power supplied'
tags: [TechReport, DeWei]

---

# TechReport: Research about USB as Power supplied

## USB has poor PSRR PSU when you didn't handle it

* Refer to [here](https://andybrown.me.uk/2015/07/24/usb-filtering/), this website describe phenomenon and LC-filter solution
  * Vpp of noise about 100mV
  


## Can't delivery both data and power in the USB-PD mode

Refer to [here](https://superuser.com/questions/1555007/does-usb-c-power-delivery-also-support-data-transfer)

###### tags: `TechReport` `DeWei`