Doubts in Differences between LA(limiting Amplifier and CML in optical receiver

[ricopt]

I am designing LA and CML for optical receiver
but I met problems with LA and CML
Cuz form what i research, LA circuit is almost the same with CML
Can someone tell me what's the difference for LA circuit and CML circuit ?
how does a LA circuit look like and a CML circuit should look like ?

Any Responses are grreatly appreciated

Currently this is what i design for my LA circuit
Is it correct ?

 

[erikl]

Currently this is what i design for my LA circuit. Is it correct ?

Don't think so: this is a differential output with 50Ω output resistance; both outputs are in-phase (have equal phases), however, hence the differential output voltage = 0. Sim. analysis should show you this.

 

[dick_freebird]

Any digital gate is a limiting amplifier, in a sense. The idea
of logic gates is that you stop worrying about amplitude
and delay becomes consistent. A designed limiting amp
would have a lot more thought given to the particulars -
gain, BW, when/how it limits - though a piece of "found
art" might just be put to use.