Attenuator circuit of a capacitance-sensing circuit
US8866494B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2013 |
| Grant date | Oct 21, 2014 |
| Priority date | — |
| Expiry date | Dec 4, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/044
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatuses and methods of input attenuator circuits are described. One sensing circuit includes an attenuator circuit to receive a signal from an electrode of a sense array. The attenuator circuit is configured to attenuate input current of the signal. The attenuator circuit includes an attenuation matrix including an input terminal to receive the signal and multiple resistors. The attenuation matrix is configured to split the input current into an output current of the attenuation signal on a first output terminal and a second output current on a second output terminal. The attenuation matrix is to output the attenuated signal on the first output terminal to an integrator of the sensing circuit. The attenuator circuit also includes a buffer coupled between the attenuation matrix and the integrator. The buffer is configured to maintain a substantially same voltage at the first output terminal and the second output terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.