I've made one R-2R 8-bit DAC, but the ouput is not linear and error..then i've used resistor ladder approach and use transmission gate as switch....the output is ok when there is no switches...but after i put some switches...that the voltage start to drop from and the gnd refference is at 1.xx volt not 0 anaymore...
yes the switched is matched, I've already put hard wired transmission gate in the series resistance...as for the switched to trigger the node to output I've use all same value of transistor size ratio....
I didn't understand what do u mean by large enough? can u please tell me...
In case of R-2R DAC relatively larger width transistor to make the on resistance as small as possible.
the tradeoff are clockfeedthrough, charge injection missmatch with speed.