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An interface circuit compatible with resistive and capacitive sensors

A technology of capacitive sensor and interface circuit, applied in the direction of logic circuit interface device, logic circuit connection/interface layout, etc., can solve the problem that the influence of the measurement system is difficult to eliminate, achieve cost and area saving, simple structure and principle, and save system cost Effect

Active Publication Date: 2019-06-04
XIDIAN UNIV
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Problems solved by technology

[0007] (2) Electronic switches are usually used in the measurement circuit, but the impact of the charge injection effect of the electronic switch on the measurement system is difficult to eliminate

Method used

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  • An interface circuit compatible with resistive and capacitive sensors
  • An interface circuit compatible with resistive and capacitive sensors
  • An interface circuit compatible with resistive and capacitive sensors

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Embodiment Construction

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0017] see Figure 1-3 , the present invention provides a technical solution: an interface circuit compatible with resistive and capacitive sensors, including a capacitance-voltage conversion circuit, a resistance-voltage conversion circuit, and an analog-to-digital converter 2; the capacitance-voltage conversion circuit includes a reference Capacitor 3, sensing capacitor 4, feedback capacitor array 16, first switch 5, second switch 6, third swit...

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Abstract

The invention discloses an interface circuit compatible with resistive and capacitive sensors. The interface circuit comprises a capacitance-voltage conversion circuit, a resistance-voltage conversion circuit and an analog-to-digital converter, and capacitance-voltage conversion and resistance-voltage conversion are realized by multiplexing an operational amplifier and a feedback capacitance array. According to the invention, the structural principle is simple, the system cost, the area and the power consumption can be effectively saved, users can integrate different types of sensors for application, the overall circuit has quite good linearity and quite high precision, and the development demand of a wireless sensing technology can be better satisfied.

Description

technical field [0001] The technical field of wireless sensing of the present invention is specifically an interface circuit compatible with resistive and capacitive sensors. Background technique [0002] The earliest traditional sensors used point-to-point transmission and needed to be connected to sensor controllers to form a sensor network. With the continuous development and progress of related disciplines, the sensor network also has the comprehensive processing ability to obtain a variety of information signals, forming a sensor network with information synthesis and processing capabilities. Since the end of the last century, a large number of multifunctional sensors have been used and connected using wireless technology, and wireless sensor networks have gradually formed. A wireless sensor node is generally equipped with one or more sensors to perceive the physical world. It is not only a collector and sender of information, but also a router of information. It has t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0175
CPCH03K19/017509
Inventor 彭琪刘雪莲汪坤刘伟峰李小明庄奕琪
Owner XIDIAN UNIV
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