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Replacing resistor ladder in flash ADC using mostfet

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gopalece

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Replacing resistor ladder in flash adc using mosfet

I am designing flash ADC in mentor graphics.I replaced resistor ladder using diode connected mosfets.I am getting correct reference levels before connecting circuitary(i.e comparator,encoder).But when I am repacing the diode connected mosfets in ADC , getting variations in the reference levels.How can I get correct reference levels?
 

Re: Replacing resistor ladder in flash adc using mosfet

Are there load currents into or out of your ADC over the connection points? Show this part of your schematic!
 

Re: Replacing resistor ladder in flash adc using mosfet

You shouldn't expect success here, unless you have a
surplus of magic and good luck. Body effect will
systematically mismatch segments of a MOSFET-as-resistor
ladder unless you are using SOI and Vbs=0 at each.
 
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