nannapaneni
Junior Member level 3
ASR ADC Segmantation
msb 6bit with CAP binary weighted, lsb 6bits thermometric resistor ladder
data rate 2Mbps, 28Mhz clock.
continuous-time comparator(signle stage opamp) with two cascade satges used autozeroing technique for offset cancellation(with i/p cap of 100f/500f)
when i run enob simulation only with real comparator and everything ideal with 100f cap(offset cancelation in AZ technique)gives
enob=11.8 and with 500f enob=10.8.
why enob is decreasing with cap. increase
100f cap is not too small for noise requirement, so i want to use higher cap which is degrading my enob.
** As comparator is only real there is no harmonic distortion only quantization noise. Am I right.?
Thanks in advance
-Nannu
msb 6bit with CAP binary weighted, lsb 6bits thermometric resistor ladder
data rate 2Mbps, 28Mhz clock.
continuous-time comparator(signle stage opamp) with two cascade satges used autozeroing technique for offset cancellation(with i/p cap of 100f/500f)
when i run enob simulation only with real comparator and everything ideal with 100f cap(offset cancelation in AZ technique)gives
enob=11.8 and with 500f enob=10.8.
why enob is decreasing with cap. increase
100f cap is not too small for noise requirement, so i want to use higher cap which is degrading my enob.
** As comparator is only real there is no harmonic distortion only quantization noise. Am I right.?
Thanks in advance
-Nannu
