Patent ID: 8922402
Filing Date: 2014-12-30
Classification: H03K,H03M

Abstract:
1. A comparator offset correction device comprising: a comparator configured to compare an input signal input to a first input terminal with a reference voltage input to a second input terminal; an open switch configured to open a path of the input signal to the first input terminal of the comparator; a short-circuit switch configured to equalize a voltage at the first input terminal of the comparator with a voltage at the second input terminal of the comparator; a controller configured to allow the comparator to perform comparison operation more than once with the open switch being open and the short-circuit switch being closed; and a filter configured to output a frequency signal obtained by smoothing a plurality of comparison results of the comparator, wherein the controller generates a threshold value control signal of the comparator based on the frequency signal of the filter, controls a threshold value of the comparator based on the threshold value control signal, and allows the comparator to perform the comparison operation more than once based on the controlled threshold value.