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How to match the impedance of a logic driver and its output trace?

April 26, 2017driver impedance logic output trace

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How to match the impedance of a logic driver and its output trace?

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The output impedance of the driver plus the series termination resistor at the output of the driver must equal the impedance of the trace: Z_out + Z_termination = Z_trace. For instance, if the Z_trace is 50-ohm and the Z_out is 20-ohm: 20 + Z_termination = 50; Z_termination = 30-ohm. Thus in order to match the impedance of the driver and the trace, we need to add a 30-ohm series termination resistor at the output of the driver.