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Transmitter- cml based driver doubt. Need clarification?

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Analog_Domain

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Hi

Can anyone point out the reason why we should not give rail to rail input signal to the cml based driver.


Thanks
 

Driving it far outside its signal range may put the
diff pair into cutoff and make some of the timing
attributes different than what you might think from
the spec table.

Now at some point you'd have to connect a CMOS
signal to some CML input. You'd expect that a CML
library would include such an interface cell. Unless
they demonstrated that this is a non-problem for the
particular CML driver design. Which bears checking,
"folk wisdom" vs detailed fact about the specific cell.
 

Thanks for the reply. So driver input swing must be such that diff pair will not go for cut off region. Am i correct?

Thanks
 

Pretty much. You have an output voltage swing expectation
(difference and common mode) and any input which causes
the output specs to be violated, is no good.
 

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