I am looking for a DAC design wıth NMOS and PMOS transistors as a part of a project, most of the DAC circuits that I found were builted with R-2R or with capacitors. But I need a design with MOS transistor since the porject will be implemented on Cadence and space consideration is important. DAC will be used both in 8-bit SAR ADC and in smooting filter. Sample block diagram of the project is given below, ı could not find appropriate design for DAC. Any help will be appreciated, thanks in advance.
You can look into a current steering DAC. It is basically a differential pair (5Pack) amplifier. Razavi has a introductory paper on this in his Circuit for all seasons issue.
This is the IEEE link: https://ieeexplore.ieee.org/document/8275558
This should be the same uploaded on the UCLA website: http://www.seas.ucla.edu/brweb/papers/Journals/BRWinter18DAC.pdf
However, these DACs are very high speed and consume a lot of power even when idle. You may not meet the power budget of your project using this architecture.