jeremy_zhu
Member level 2
as we all know, the dac output is just the input of comparator. my ref volt is 0~2.5V,so the mid-volt is 1.25V. 1. For example ,the 1st sampling point is 1.4 (p input) and 1.1 (n input), 0.3V differential, so the initial input of comparator should be 1.1(p input of comp) and 1.4 (n input of comp). but my value is ~1.09(just ok?!), and ~1.34 of the other( a little bit smaller than the desired value)
2.so the output of dac should be close to the mid_voltage step by step . but as show in the pic, it will be close to 1.22V or 1.26V , 1.19V etc.
question: what cause the ~1.34 (just opposit bit cycling clk of the two dacs).
why is that not equal to 1.25V at last (guess because of the upper problem).
give your opinion please.
pic here:
2.so the output of dac should be close to the mid_voltage step by step . but as show in the pic, it will be close to 1.22V or 1.26V , 1.19V etc.
question: what cause the ~1.34 (just opposit bit cycling clk of the two dacs).
why is that not equal to 1.25V at last (guess because of the upper problem).
give your opinion please.
pic here: