venki_vlsi wrote on May 13th, 2007, 9:32pm:hi,i am designing 10 bit DAC with sinlge ended output.
I want to know how much output impedance is required for single current source to acheive sfdr of 60db and inl of 1 lsb.
I searched many papers ,they r giving for differenctial output impedance. Is there any relation to find outimpedance for single ended ouput i from differenal output having same sfdr and inl. I am not sure if this valids ( 2*differentaloutput impedance=single ended outout imopedance).
Thanks in advance.
Single ended and differential current steering DAC suffer distortion from different mechanism.
Differential DAC can cancel HD2 and suffer only HD3 which is a lot lower.
Single ended DAC suffer HD2 which is approximated by
(RL/Ru)*2^N/4