| 摘要 |
A position indicator has a first electrode, an inverting amplifier and electrical isolation circuitry. The first electrode, in operation, receives an input signal from a capacitive touch panel and transmits a reference signal. The inverting amplifier has an input coupled to the first electrode, and, in operation, inverts and amplifies the input signal. The electrical isolation circuitry has an input coupled to an output of the inverting amplifier, and, in operation, generates the reference signal based on the inverted and amplified input signal. |
| 主权项 |
1. A position indicator, comprising:
a first electrode, which, in operation, receives a first signal; an inverting amplifier coupled to the first electrode, wherein the inverting amplifier, in operation, inverts and amplifies an input signal, the input signal being based on the first signal, and outputs the inverted and amplified signal; an isolation circuit having an input terminal and an output terminal insulated from each other in the isolation circuit, the input terminal of the isolation circuit being coupled to an output of the inverting amplifier; a first low-level side power supply wiring to supply a first low-level side power supply potential to the isolation circuit; a first high-level side power supply wiring to supply a first high-level side power supply potential to the isolation circuit; a second low-level side power supply wiring to supply a second low-level side power supply potential to the inverting amplifier, the second low-level side power supply wiring being coupled to the output terminal of the inverting amplifier; a second high-level side power supply wiring to supply a second high-level side power supply potential to the inverting amplifier; a first power supply circuit coupled between the first low-level side power supply wiring and the first high-level side power supply wiring; a second power supply circuit coupled between the second low-level side power supply wiring and the second high-level side power supply wiring; and a casing having a conductive region, the first low-level side power supply wiring being coupled to the conductive region of the casing. |
