I often wonder if anyone has ever attempted to build a semi-descrete DAC (no DAC chip) simply just using cmos logic, memory and analogue ccts on a large pcb. You could trim any part of the cct for whatever parameter you need at every stage.(Such as linearity)

This would be something different.

D

Lots of people have done it.

What sort of DAC do you want?

There are tons of discrete R2R DAC's, single ended and balanced.

There is one discrete, segmented R2R + unity weighted DAC (like AD1865 etc) being done that I know of.

There are discrete (1 bit) DSD DACs with 16 or 32 unity weighted OP bits arranged as an (averaging) FIR filter

There is another guy I know doing (1 bit) DSD differential current source DAC with various number of unity weighted elements

It's interesting, when you look at all these various approaches, they all have advantages and disadvantages.

To get any of them to work really well requires a very broad knowledge from PCB design to intricate details of logic families, clocking etc etc.

And then there are aa myriad of chips out there that can be used in so many different ways.

That's just the DAC - you have to get all the bits into the DAC without messing up.

So many options.

T