How can a digital to analogue converter be designed to produce a squared output?

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SUMMARY

The discussion focuses on designing a digital to analogue converter (DAC) that produces a squared output, where lower voltage levels correspond to smaller analog equivalents. Participants suggest using an ordinary DAC in conjunction with an operational amplifier (Op-Amp) or constructing a resistor-ladder DAC with adjusted resistor values. The consensus emphasizes performing the multiplication on the digital side of the converter for optimal results.

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How can you design a digital to analogue converter such that it has a squared output. i.e. the analog equivalent of the digital step is smaller at the lower voltage levels than at the higher voltage levels
 
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I guess you could use an ordinary DAC together with an Op-Amp. Or, if it's good enough for your purposes, you could build a simple resistor-ladder DAC and change the values of the resistors accordingly.
 
You can do the multiply at either the digital or analogue side of the convertor, preferably the digital side.
 

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