# Regular Meeting (2023.3.20) * Fanout-48 * Add switch for ODD/EVEN channels * Continuing from [last week's issue](https://hackmd.io/@BelleII-CDC-Trig-NTU-DeWei/Bk3Xgqukh) * Select 2 channels analog switch * ODD/Even * TMUX1136 * With/Without 50 ohm test point * Impedance matching for the trace * Reviewing the layout ## Impedance matching for the trace ![](https://i.imgur.com/u4mjn34.png) ![](https://i.imgur.com/TUpLGZi.png) [Transmisson Line](https://en.wikipedia.org/wiki/Telegrapher%27s_equations) ![](https://i.imgur.com/8R5Jzk6.png) ###### tags: `Regular Meeting` `DeWei`