50 - ohm impedance required in cadstar

[antarveena1982]

Hi All

I have query regarding one of RF trace whose impedance is needed to be 50ohm. The PCB is of 4 layers stack up

Top Electric
GND
VCC
Bottom

The route is on the top side , can any body help me how i can achieve this .

Antarveena

 

[senilicus]

Use any of the free calculators that you find on the internet like ;


http://www.ideaconsulting.com/dstrip.htm
http://www.ultracad.com/calc.htm
**broken link removed**
http://chemandy.com/calculators/microstrip_transmission_line_calculator.htm


A search with 'Google' will find a lott more.

 

[abhi002]

Impedance generally depends on
- PCB trace width
- PCB stack up
for exact calculation ,u have to get ur correct stackup. then from above listed calculatiors orelse CAdstar SI verify, u can get the exact width of trace to achive the desired impedance

 

[cyberrat]

Don't forget to mention this on your fab notes.