Patent ID: 9722621
Date: 2017-08-01
CPC Classifications: H03K,H03M

Claim:
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, a second capacitor, a first calibration switch, and a second calibration switch, the first capacitor and the second capacitor being configured in parallel through the 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 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 feedback loop circuit including a digital integrator and a DAC, the digital integrator being electrically coupled to the comparator and storing an m-bits value, the m-bits value being updated using the modification value, the DAC being electrically coupled between the digital integrator and the second calibration switch and configured to convert the n MSBs of the m-bits value to a calibration voltage, n being less than or equal to m.