公开(公告)号：US20120206281A1

公开(公告)日：2012-08-16

申请号：US13025855

申请日：2011-02-11

申请人： Rizwan BASHIRULLAH ,  Jikai CHEN

发明人： Rizwan BASHIRULLAH ,  Jikai CHEN

IPC分类号： H03M1/00 ,  H03M1/36 ,  H03M1/10

CPC分类号： H03M1/1061 ,  H03M1/1004 ,  H03M1/365

摘要： Calibration of an analog-to-digital converter (ADC) is accomplished via a reference comparator, a first and second multiplexer (MUX), and a finite state machine (FSM). By sampling an analog input with the reference comparator and comparing the results with those of the ADC using the FSM, all the comparators in the ADC can be calibrated without interrupting the ADC's normal operation. The first MUX provides a same reference voltage to the reference comparator as a comparator selected for the calibration, and the second MUX provides the FSM with the output of the selected comparator. The FSM then performs a comparison of the reference comparator and the selected comparator, extracts the polarity of the mismatch, and updates the contents of a memory with the extracted polarity. An offset control in the selected comparator receives a signal corresponding to the extracted polarity stored in the memory and injects offset current into the comparator.

摘要翻译： 模数转换器（ADC）的校准通过参考比较器，第一和第二多路复用器（MUX）和有限状态机（FSM）来实现。 通过使用参考比较器对模拟输入进行采样，并使用FSM将结果与ADC的结果进行比较，ADC中的所有比较器都可以在不中断ADC正常运行的情况下进行校准。 第一MUX为参考比较器提供相同的参考电压作为选择用于校准的比较器，而第二MUX为FSM提供所选比较器的输出。 然后，FSM执行参考比较器和所选比较器的比较，提取失配的极性，并以提取的极性更新存储器的内容。 所选择的比较器中的偏移控制器接收对应于存储在存储器中的提取的极性的信号，并将偏移电流注入比较器。