Patent ID: 11860022
Assignee: MICROCHIP TECHNOLOGY INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. An apparatus, comprising:
a detector, wherein a signal that the detector is configured to sense is a differential value indicative of a difference in self-capacitance indications exhibited at first and second internal capacitors, wherein the differential value is proportional to a vertical elevation of a surface of a material present at a device-under-test coupled to electrodes of the detector,
wherein a first sensor is to change a voltage level of a first voltage at least partially responsive to changes in a first self-capacitance, wherein the first sensor comprises:
a first acquisition circuit, the first acquisition circuit to generate the first voltage at the first internal capacitor; and
a first measurement circuit, the first measurement circuit to generate a first value, the first value indicative of a voltage level exhibited by the first voltage, and

wherein a second sensor is to change a voltage level of a second voltage at least partially responsive to changes in a second self-capacitance, wherein the second sensor comprises:
a second acquisition circuit, the second acquisition circuit to generate the second voltage at the second internal capacitor; and
a second measurement circuit, the second measurement circuit to generate a second value, the second value indicative of a voltage level exhibited by the second voltage.