Hi Guys,

I need to design Very low noise 8 bit DAC which should have integrated noise less than 50 uV. It is voltage DAC with 1 MHz BW. I do not want to use Current steering topology which will again need I/V Amp which would add more noise.

Please, suggest me architecture.

Thank You & Take Care

in fact capacitor charger based dac is voltage dac, but finally you need an opamp i guess otherwise you need to find some thing to buffer it out.

loose-electron wrote on Dec 22^nd, 2011, 4:03am:


I'm guessing it is a reference bias with trim to manage for process and DES^* corners.

Integrated noise is going to be limited by how much filtering you can have, so I think the best approach would be the simplest: an 8 bit tapped resistor dividing down a reference voltage and feeding an RC low pass filter.

^*Design Engineer Skill

hello lex,
what do you mean by dc setting?

thanks,
raj.

I like RobG's solution. Easy to implement.  -- Yawei

No follow up from the OP, so no clarification on what they wanted.