# Electronic Design

# PCB Design



# PCB Design Checklist

##### PCB Design Checklist for less errors 

#### Preplanning

* Start with a Simple requirements documents , a simple excel sheet will do ( google sheets with tiny url ) 
* It should cover basic functional requirements ( these can later on be assessed with Verification and Testing )
* Unless needed avoid expensive and unkown parts . 
* Confirm input supply , total power requiremenst , Layout for I/O and dimensions. 

#### Schmeatic Design

* All new parts to be double checked for pinout
* Create schematic in a frame with different sections broken out , if too big break in pages. 
* Component rating to be 1.5 the required ratings 
* Check active compoents for min and max voltages 
* Make sure engough capacitance is there on output of LDO / Buck
* Do not forget decoupling caps 

#### PCB Design

* Make sure to have Date and Name for the project
* Placement of components is 80% job done so most important
* Place in a fixed grid , maing maching placement easy
* Minimum 3 fiducials 
* Use JLC 4 layer as default setup 
* Are there any Current Resisor ( Make Sure size is correct ) and sections are isolated
* Power traces please calculate accordingly 
* Unless going into a Enclosures , make sure to have mounting holes 
* Touchpad for all voltages ( small pads will do ) 
* Use SMT unless no other options
* Does anything themal management 
    
    * heatsink if Themal dissapation is high ( space for heatsink ) 
    * Bottom vias hemal pad is there / large via 
    * If a pad has to transfer heat avoid themral erliedf around 
    
* High speed / Differential lines need impedance matching 

    * avoid vias on these lines
    * provide solid plances under them
    
* Cannot fulfill current in trace then remove solder mask for solder to increase current. 
* Avoid right turns and try to group similar signals 


##### Design tools 

* [Trace calculator](https://www.4pcb.com/trace-width-calculator.html)
* [JLC Stackup](https://jlcpcb.com/impedance)
* [Impedance calculator](https://jlcpcb.com/pcb-impedance-calculator/)

#### Verification and Testing

* 

#### Prototypes

* Go step by step , 
*