This is Lee Ritchey's figure on Emitter Coupled Logic (ECL) Differential Pairs. Values may be off for real ECL logic so, proceed with caution.
The point though is to show how (what I am going to call it is) 'Digital' "Differential Amplifiers" (which Lee calls it a Current Switch) do not work like they do with 'Analog' Differential Amplifiers, and may carry with them differing characteristics.
