| 摘要 |
A circuit for measuring a capacitive charge comprises a latched comparator and a determination module. The latched comparator comprises an input and an output. The input is coupled with a sensor electrode of a capacitive input device. An inverted version of the output is coupled with a feedback loop. The feedback loop is configured to provide feedback to the input to maintain the input at a predetermined voltage. The feedback is provided in clocked charge quanta steps based on a clock signal. The determination module is coupled with the output and configured to determine a change in capacitance on the sensor electrode by equating output signals from the output with an amount of charge provided to the input to reach the predetermined voltage. |
