seetoo
Newbie level 1
adc mid-code
Testing my 10bit pipelined ADC,(SMIC 0.18 process)
when diff input both connect dc commen input voltage(0.9V), the output code is not 511.
and the output code in 3 Evaluation Board is different respectively(1# is 485,2# is 540, 3# is 604).
It may because offset of opamp ,but should not so large(about 50mV).
So ,what else may cause the code excursion?
Testing my 10bit pipelined ADC,(SMIC 0.18 process)
when diff input both connect dc commen input voltage(0.9V), the output code is not 511.
and the output code in 3 Evaluation Board is different respectively(1# is 485,2# is 540, 3# is 604).
It may because offset of opamp ,but should not so large(about 50mV).
So ,what else may cause the code excursion?