Full-wave synchronous rectification for self-capacitance sensing
AssigneeCypress Semiconductor Corporation
InventorAndriy Maharyta
Life of this patent
Estimating the term…
Abstract
An apparatus and method to measure a self-capacitance of a capacitive sense array is described. The apparatus includes a first integrating capacitor, a first modulator, a second integrating capacitor, and a second modulator. The first modulator is operatively coupled to the first integrating capacitor. The second modulator is operatively coupled to the second integrating capacitor. The first modulator in conjunction with the first integrating capacitor and the second modulator in conjunction with the second integrating capacitor measure a self-capacitance of a capacitive-sense array by performing a full-wave synchronous rectification.
Claims20
An apparatus comprising:
- a first integrating capacitor;
- a first modulator operatively coupled to the first integrating capacitor;
- a second integrating capacitor;
- and
- a second modulator operatively coupled to the second integrating capacitor, wherein the first modulator in conjunction with the first integrating capacitor and the second modulator in conjunction with the second integrating capacitor measure a self-capacitance of a capacitive-sense array by performing a full-wave synchronous rectification.
An apparatus comprising:
- a capacitive-sense array comprising a plurality of electrodes, the capacitive-sense array to detect a touch proximate the plurality of electrodes;
- a first integrating capacitor;
- a second integrating capacitor;
- and
- one or more modulators operatively coupled to the first integrating capacitor and the second integrating capacitor, wherein the one or more modulators in conjunction with the first integrating capacitor and the second integrating capacitor measure a self-capacitance of a capacitive-sense array by performing a full-wave synchronous rectification.
A method comprising:
- measuring a self-capacitance of a capacitive-sense array by performing a full-wave synchronous rectification using a first integrating capacitor corresponding to a first modulator and a second integrating capacitor corresponding to a second modulator, wherein the capacitive sense array comprises a plurality of electrodes;
- and
- generating, responsive to the measuring, a first measurement and a second measurement indicative of the self-capacitance of the capacitive-sense array.
Dependencies are inferred from the claim text.