Project

To design a double sided USB type C to RJ45 ethernet interface PCB utilizing bus-powered following the length matching of the high speed signals and EMC/EMI complaint.

AAkash Verma14 Nov 2021

Project on PCB Design:

To design a double-sided USB type C to RJ45 ethernet interface PCB utilizing bus-powered

following the length matching of the high-speed signals and EMC/EMI complaint.

Challenge:

Creating a workspace for LAN7800 in Altium
Defining a PCB board size using the DXF data provided
PCB clearance to be set as 0.15mm and track width to be 0.2mm for power line and

0.15mm for the rest of the circuit

Following the block diagram provided for creating the schematic and using the datasheet

for creating the footprint and symbol.

Use Saturn PCB tool to find the values for 100ohm impedance for the high speed

differential pair signals

Set PCB to 4 layers following the board stack-up provided
Identifying the key points to consider for PCB design using the datasheet
Assemble and route the components as recommended by the datasheet
Place the components on both sides of the PCB and tracking on both sides.
Add 2 fiducials diagonally opposite
PCB board with the text (“Ethernet Interface”)
Generate 3D files for all the components and a 3D view.
Generate PCB panel of 150mm x 150mm and place as many circuits as possible and

follow routed method using mouse bites

Generate complete output files for DFM and DFA (Gerber, Altium draftsman, X Y data,

BOM, assembly diagram, fabrication diagram)

Your Answers

Creating a workspace for LAN7800 in Altium

Defining a PCB board size using the DXF data provided

PCB board size (in mils) : 2155x870

To make Board shape as a required dimension: Go to Design>> Board shape>> Define Board Shape From Selected Object after creating the outline of the required dimension of 2155x870 mil