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circuit device

A technology of circuit device and power supply, which is applied in the fields of electrical digital data processing, instrumentation, calculation, etc., can solve problems such as the reduction of capacitance value, and achieve the effect of eliminating the influence of parasitic elements

Active Publication Date: 2020-01-03
SUZHOU PIXCIR MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the switch in the circuit itself has parasitic capacitance, the setting of switch S1 has its own advantages and disadvantages. In this case, the entire capacitance value becomes smaller, and the parasitic capacitance becomes the main part of the entire capacitance value.

Method used

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Embodiment Construction

[0028] In order to better understand the present invention, several embodiments are specifically introduced below. Apparently, those skilled in the art can realize the present invention without the following embodiments. In order to avoid confusion, in some embodiments, components and circuit connections are introduced in the form of structural diagrams.

[0029] Among them, the finger as the capacitive sensing source mentioned in the article is the object that the measuring device wants to measure. The object measured by the measuring device is generally considered to be a finger or other suitable objects. For the convenience of reading, "or other objects" are omitted in the text.

[0030] by Figure 5 and Figure 6 As an example to illustrate how the imbalance of the system caused by the touch of a finger is adjusted to achieve a balance again, and figure 1 Compared to the addition of multiple variable capacitors C 1 、C 2 、C 3、C 4 、C 5 and C 6 to the sensing electrod...

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PUM

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Abstract

The invention relates to a circuit device, a terminal of which is connected to a circuit network stimulated by a stimulating source, wherein the circuit device comprises at least one controllable power supply and at least one capacitor. The invention also relates to a method for connecting the terminal with the controllable power supply through the capacitor, wherein the control function of at least one output end of the controllable power supply is within a potential parameter range of the terminal or stimulating source. The circuit device is simple in structure; and because the circuit device is used for regulating the capacitor, in order to use an internal voltage source, nodes inside the circuit device are set, and thus the influence of a parasitic element is eliminated.

Description

technical field [0001] The invention relates to a circuit device, in particular to a high-precision different capacitance adjustment method, which can be used to measure the capacitance change of fingers or other similar objects on touch screens, touch panels, touch keys and other applications. Background technique [0002] Currently, there are many methods for measuring the capacitance between the electrodes of the touch-sensitive surface. One way is by measuring the capacitance between each electrode and comparing the current measured capacitance with previous measurements of the same electrodes, this measurement is done by oscillating the electrodes in the circuit and measuring the frequency in the circuit , the frequency of the oscillating circuit is related to the capacitance of the electrodes, and the change in frequency is related to the change in capacitance of the electrodes; another method involves electrodes in a bridge (cf. US2010 / 0315102A1), on which the voltage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
Inventor 保罗·格兰德维兹
Owner SUZHOU PIXCIR MICROELECTRONICS