Jacki
|
Hello, I am try to design a SAR-ADC example, and I try to build a comparator first. The comparator I used is from the paper "A 0.8-mW 5-bit 250-MS/s Time-Interleaved Asynchronous Digital Slope ADC", the structure of the comparator and the testbench I used are shown below. The comparator is differential, I use 900mV DC voltage at the negative input, at the positive input, I use the ramp voltage from 850mV to 950mV, 1mV per step. This testbench I used is for the offset test. The problem is this comparator doesn't work. I cannot find any reason. I also try to reset the inputs, but still I cannot get the correct results. Can anybody hint me some potential errors I did? Thank you.
|