[SI-LIST] Impedance match of a 100Mhz line
- From: Barthi das <barthi1@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 9 Mar 2009 01:40:02 -0700 (PDT)
All,
Have a digital input that operates at 100Mhz. Have aksed the PCB design
engineers to have the charactertsic impedance of the trace as 50 Ohms.
Question is :
They will still be reflection as per the equation (ZL-Z0)/(ZL+Z0)
Since the input impedance of digtial pin is very high reflection (ZL tending
to infinity)coefficient at the digital pin is 1. Does that sound correct ?
Regards
Bharath
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