POTENTIAL SENSING CIRCUIT FOR SENSING DIFFERENTIAL VOLTAGE LEVEL OF DIFFERENTIAL CAPACITOR

摘要

PURPOSE: A potential sensing circuit for sensing a differential voltage level of a differential capacitor is provided whose voltage sensing part is configured of a tri-state buffer to sense even the small voltage level difference of the differential capacitor. CONSTITUTION: A potential sensing circuit for sensing a differential voltage level of a differential capacitor includes a voltage sensing unit(250) that is converted from an inactive state to an active state after a lapse of a predetermined time after application of a differential voltage pulse for charging the differential capacitor up to a predetermined voltage level, to sense the voltage level of the capacitor. The potential sensing circuit is configured of a tri-state buffer.