Patent ID: 11893175
Assignee: MICROCHIP TECHNOLOGY INCORPORATED
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 7:
8. An apparatus, comprising:
a measurement circuit to take self-capacitance measurements of a sensed line during at least two measurement phases of a measurement acquisition cycle, the at least two measurement phases including a positive pre-charge measurement phase and a negative pre-charge measurement phase; and
a driven shield circuit to generate a shield voltage at a non-sensed line during the at least two measurement phases of the measurement acquisition cycle, wherein to generate the shield voltage, the driven shield circuit to:
hold the shield voltage at a first voltage rail during one of the positive pre-charge measurement phase or the negative pre-charge measurement phase; and
change the shield voltage, in an increasing or a decreasing manner, from the first voltage rail to a second voltage rail during the other one of the positive pre-charge measurement phase or the negative pre-charge measurement phase.