aaron_do
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Clocked and Latched.
Basically the one I'm using has a first stage "dynamic preamp" and a second stage latch. The dynamic preamp's output is reset to VDD with PMOS transistors, and then on the clk signal, the input diff-pair turns ON and the PMOS load turns OFF which pulls the output CM down to ground with some differential gain along the way. About halfway down, the preamp triggers the next stage latch. Because the PMOS load is OFF, the gain of the preamp is very high and it uses little power because it is dynamic.
Aaron
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