12 bits R-2R DAC design

[test_123]

I want to use poly resistor to design a 12 bits voltage mode output dac based on R-2R structure. in spite of resistor matching, I found that the voltage coefficient of ploy resistor affect dac accuracy much, any good way to remove this effect or what other structures for 12 bits voltage mode output dac design? thanks!

 

[kak111]

mists
Junior Member
Posts: 12

12 bits R-2R DAC design
Aug 29th, 2011, 6:56pm
I want to use poly resistor to design a 12 bits voltage mode output dac based on R-2R structure. in spite of resistor matching, I found that the voltage coefficient
of ploy resistor affect dac accuracy much, any good way to remove this effect or what other structures for 12 bits voltage mode output dac design? thanks!

Your answer is here already..........
The Designer's Guide Community Forum › Design › Mixed-Signal Design › 12 bits R-2R DAC design


Added info............
The complete 1970-vintage 12-bit DAC solution, shown in Figure 12
https://www.analog.com/static/imported-files/tutorials/MT-015.pdf

 

[dick_freebird]

Heavier doped poly might fare better. What are your options?
A metallic thin film resistor is of course better, but you'd have
to add a penny per chip or something.