Patent ID: 9356615
Filing Date: 2016-05-31
CPC Classification: H03K,H03M

Claim Text:
1. A system for providing comparator calibration, the system comprising: a voltage input; a low pass filter module electrically coupled to the voltage input and comprising a first capacitor and a second capacitor, the first capacitor and the second capacitor being configured in parallel through a first calibration switch, the first capacitor being characterized by a first capacitance value and the second capacitor being characterized by a second capacitance value, the first capacitance value being greater than or equal to the second capacitance value, the low pass filter being configured to provide an output voltage based at least on a first voltage of the first capacitor; a first calibration switch provided between the first capacitor and the second capacitor; a comparator electrically coupled to the low pass filter module and configured to generate a modification value, the modification value being positive if the output voltage is greater than 0, and the modification value being negative if the output voltage is 0 or less; a digital integrator electrically coupled to the comparator and storing an m-bits value, the m-bits value being updated using the modification value; a DAC electrically coupled to the digital integrator, the DAC being configured to convert the n MSBs of the m-bits value to a feedback voltage, n being less than or equal to m; and a second calibration switch provided between the second capacitor and the DAC.