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Question for MIPI receiver termination resistor value

CM Huang
Prodigy 10 points
I know that for having maximum power transmission, MIPI receiver termination resistor should match impedance of transmission lines. And the termination resistance is 100 Ohm typical. (spec 80~125 Ohm)
My question is described as below:
For MIPI receiver with on-chip termination, if under impedance matching(i.e., ideally on-board transmission line can match termination resistor),
is there any advantage or disadvantage or side effect if termination resistor of receiver is changed from 100 ohm to 90 ohm ? (i.e., tune termination resistor to smaller value) ?
      I guess (1) higher termination may have higher differential voltage and improve signal integrity but it increases power consumption on termination resistor. So lower termination resistor can get lower power consumption, right?
or
(2) lower termination resistor --> lower differential input voltage --> ensure the OP-Amp of receiver oprerating in linear region --> avoid OP-Amp saturation effect --> avoid OP-Amp output signal distortion  ?
Which is right ?
Or you have any other viewpoint ?
Please kindly give me some suggestions.
Many thanks!
 
CM.
  • 0
    TI__Mastermind 20985 points

    CM, sorry about the delay in getting a response.

    You're correct that a higher termination value causes higher differential voltage.  However, there might not be any difference in system power consumption, because the transmitter will source the same current no matter what termination is present.  The termination resistance value should always be matched with the characteristic impedance of the trace, in order to minimize signal reflections and EMI.

    Best regards,
    RE