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Capacitance measuring device with reduced noise

A technology of capacitive sensor and receiving electrode, which is applied in the direction of measuring device, measuring force, electronic switch, etc., can solve the problem of short scanning time intensifying the distinction and so on

Active Publication Date: 2022-03-25
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the requirement for short sweep times exacerbates the problem of distinguishing signal from noise occupying adjacent frequencies

Method used

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  • Capacitance measuring device with reduced noise
  • Capacitance measuring device with reduced noise
  • Capacitance measuring device with reduced noise

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Embodiment Construction

[0020] According to various embodiments, the proposed solution is to take multiple measurement samples for a given choice of active receive electrode or active transmit electrode and integrate such samples with different gains. For example, a sample is a voltage sample converted by an A / D circuit, but the concept is not limited to digital, it also applies to analog discrete time circuits such as switched capacitor circuits and charge integrating circuits. The plurality of samples forms a packet; and the packet is delimited by a change in the selection of the active electrode.

[0021] For example, according to various embodiments, the following method is proposed: after an active electrode change, the system gradually increases the importance of the measured sample until the middle of the packet, and then gradually decreases its importance before the next change of electrode . Therefore, samples collected after or before the change contribute less to the overall result.

[0...

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Abstract

The present invention discloses a method or sensor arrangement for providing capacitive sensor detection using at least one capacitive sensor comprising a transmitting electrode and a receiving electrode. Stimuli are generated at the transmit electrodes, signals are received from the receive electrodes, and data packets are generated, each packet including a plurality of samples. The plurality of samples are weighted by providing a small gain at the beginning and end of each packet relative to the center of each packet; and the weighted samples are integrated to produce an output signal for each packet.

Description

[0001] Related patent applications [0002] This application claims priority to commonly owned U.S. Provisional Patent Application No. 62 / 238,318, filed October 7, 2015, which is hereby incorporated by reference for all purposes middle. technical field [0003] The present invention relates to methods and systems for capacitance measurements, in particular capacitance measurements with reduced noise. Background technique [0004] Projected capacitive sensors are often incorporated into touch screens, touch pads or buttons. Similar sensors are used in touchless three-dimensional position detection sensor arrangements. Such sensors use receive electrodes, and in some embodiments also transmit electrodes. When two electrodes are used, one electrode acts as a transmitter and the other electrode acts as a receiver. A matrix can be formed to allow multiple keys to share transmit and receive lines. In practice, the measurement systems connected to the receiving electrodes are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/955G06F3/041G06F3/044H03K17/96
CPCH03K17/955H03K17/962H03K2217/960705H03K2217/960775G06F2203/0339G06F3/0416G06F3/03547G06F3/0446G06F3/04182G01L1/146G06F3/0448G06F3/044
Inventor L·波特曼
Owner MICROCHIP TECH INC