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Multi-functional capacitance sensing circuit with a current conveyor

A technology of current transmitter and capacitive sensing, which is applied in capacitance measurement, measurement of resistance/reactance/impedance, instruments, etc., and can solve problems such as poor noise immunity

Active Publication Date: 2014-07-02
谱瑞科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is poor noise immunity, since the underlying input circuitry may be too sensitive to ambient noise

Method used

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  • Multi-functional capacitance sensing circuit with a current conveyor
  • Multi-functional capacitance sensing circuit with a current conveyor
  • Multi-functional capacitance sensing circuit with a current conveyor

Examples

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Embodiment Construction

[0029] The following description sets forth numerous specific details such as examples of particular systems, components, methods, etc., in order to provide a better understanding of several embodiments of the invention. It will be understood, however, by those skilled in the art that at least some embodiments of the invention may be practiced without these specific details. In other instances, well-known components or methods have not been described in detail, or are presented in simple block diagram format in order not to unnecessarily obscure the present invention. Accordingly, the specific details set forth are exemplary only. Particular implementations may vary from these exemplary details and still be contemplated within the spirit and scope of the invention.

[0030] Reference in the description to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one emb...

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Abstract

An apparatus and method of sensing capacitance of one or more sensor elements in multiple capacitive sensing modes, including a self capacitance sensing mode and a mutual capacitance sensing mode.

Description

technical field [0001] This disclosure relates generally to touch sensors, and more particularly, to capacitive touch sensors. Background technique [0002] Capacitive touch sensors can be used to replace mechanical buttons, knobs, and other similar mechanical user interface controls. The use of capacitive sensors allows for the elimination of complex mechanical switches and buttons, providing reliable operation under harsh conditions. Additionally, capacitive sensors are widely used in modern consumer applications, providing new user interface options within existing products. [0003] Capacitive touch sensors may be arranged in the form of an array of sensors for the touch-sensing surface. When a conductive object, such as a finger, is in contact with or in close proximity to a touch-sensing surface, the capacitance of one or more capacitive touch sensors changes. The change in capacitance of a capacitive touch sensor can be measured by an electrical circuit. Circuitry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
CPCG01R27/2605H03K17/955G06F3/044H03K2217/960725H03K17/9622G06F3/0446G06F2203/04112
Inventor 维克特·奎曼安德理·马哈瑞塔
Owner 谱瑞科技股份有限公司