I have a project of 20kHz 12(or 14)Bit DAC. Do i need to use R-2R architecture to design it? And who can give me some advice or papers of this kind of DAC design.
Generally speaking, 12 to 14 Bit is feasible without trimming as long as the chip area and power is not an issue. The key point here is the matching of your resistors in the R-2R network. There is a 14 Bit DAC using current steering technique published.
I have found more than two chips useing R-2R ladders architecture that can meet 14-16bit. There are AD5541 and AD5551 by Analog Devices. My design is just like these two chip.