DanielLam wrote on Apr 29th, 2016, 11:38pm:That circuit looks like the Resistive DAC 4.3.
I see the cross-coupled switches, and the voltages are switched between the rails.
"H59" is not Gnd. And "H58" is not Vdd.
DanielLam wrote on Apr 29th, 2016, 11:38pm:For current DACs, I would be expecting differential pairs and current sources.
PMOS where its gate is fed by "H59" consitute source current.
NMOS where its gate is fed by "H58" consitute sink current.
Cross-coupled switches constitute differential pairs.
Basic topology is completely same as attached one, if we remove additional circuits inside red and blue boxes.