---
# System prepended metadata

title: Regular Meeting (2023.8.14)
tags: [Regular Meeting, DeWei]

---

* Testing boost converter (5v to 5.5V)
* Present about fanout board
	* Quick implemention way

## 1. Testing boost converter

![](https://i.imgur.com/3NgarGz.png)

* No filter
	* ![](https://i.imgur.com/b2d2N9J.png)
* With filter (20MHz)
	* ![](https://i.imgur.com/EzB5F27.png)

### 1.1 Summery: 

* Needs to consider how to design filter to eliminate spike

## 2. The Current State of FanOut-48 Boards

* V1 board can't output negative voltage
	* Fatal problem
* [Distrotion](https://hackmd.io/iEFjZ2p2TgOp4TjUZClLmw?view#Source-100KHz-15Vpp-FuncGen50-ohm)

### 2.1 Quick solution

Swap output: GND <-> Vo_CH_n
* Only output negatve voltage
* Distortion is still not solved


### 2.2 Complete solution

* Using 8ch-fanout board solution(ICs)
* Apply above power soultion
	* DC-DC: USB 5V to +-5.5V or higher for LDO-in
		* For 5V output LDOs, input need > Vdrop at least
			* Vdrop ~300mV for modern MOSFET drived LDOs