It is well-known that the CML or SCL DFFs can achieve high-speed divide-by-2 function. The figure attached shows a simple CML DFF. Different kind of bias for the CML is popular. 1. No current tail is utilized; 2. M3,4 and M5,6 are biased by different currrent tail I1 and I2, respectively; 3. The sampling transistor M3,4 and M5,6 share the same current tail.
Two simple DFF cell can achi...
