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Mixed signal processing device

A processing device and mixed signal technology, which is applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve the problem of multi-channel signal mutual interference, low signal-to-noise ratio, and signal processing module cannot identify weak signals and other issues to achieve the effect of achieving accuracy, improving signal-to-noise ratio, and eliminating light interference

Pending Publication Date: 2020-09-25
GUANGZHOU HUAXIN ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present application provides a mixed signal processing device, which solves the technical problems that the existing signal processing module cannot identify weak signals, the signal-to-noise ratio is low, and mutual interference is easily caused by multi-stage amplification and multi-channel signals

Method used

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Embodiment Construction

[0038] In the prior art, the signal processing solution in the prior art includes a power supply module, an infrared emission tube control module, and a signal processing module. Among them, the power module includes an LDO (Low Dropout Regulator, low dropout linear regulator) or a DC-DC converter, and the size of a single device is large and the number is large, so that the occupied PCB area is relatively large. The infrared emission control module builds the infrared emission tube control circuit through logic chips such as shift registers and 3-8 decoders to realize the switch control of the infrared emission tube, which makes the single device larger in size and quantity, and there are many connecting wires, resulting in The occupied PCB area is large and the cost is high. The signal processing module amplifies the current signal by a triode and an operational amplifier. Since the noise of the triode will increase with the increase of temperature and current, weak signals ...

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Abstract

The invention discloses a mixed signal processing device. The mixed signal processing device comprises a signal processing module; the signal processing module comprises a current compensation circuit, a transimpedance amplification circuit, a differential amplification circuit and an analog switch circuit which are connected in sequence; the current compensation circuit is used for eliminating adirect current signal in the current signal; the transimpedance amplification circuit is used for converting the current signal into a voltage signal, amplifying the voltage signal and filtering a high-frequency signal in the voltage signal; the differential amplification circuit is used for amplifying the voltage signal to a recognizable range of the analog-to-digital converter; the analog switchcircuit is used for controlling the signal processing module to open and close, and the signal processing module outputs signals to the outside through the analog switch circuit. The technical problems that an existing signal processing module cannot recognize weak signals, the signal-to-noise ratio is low, and mutual interference is easily caused by multi-stage amplification and multi-path signals are solved.

Description

technical field [0001] The present application relates to the technical field of signal processing circuits, and in particular to a mixed signal processing device. Background technique [0002] The main working principle of the infrared touch screen is to install infrared emitting tubes on one side of the Y-axis direction and one side of the X-axis direction of the front frame of the screen, respectively, and install corresponding photosensitive tubes, infrared emitting tubes and photosensitive tubes on the opposite sides of the screen. A criss-cross infrared matrix is ​​formed in front of the screen. The switch of the infrared emission tube is controlled by the logic control chip, and the signal of the photosensitive tube is amplified by the triode and the operational amplifier. After receiving the infrared rays, the photosensitive tube converts the optical signal into an electrical signal through photoelectric conversion, and then amplifies the signal and finally converts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041G06F3/042
CPCG06F3/0416G06F3/042
Inventor 谢旺薛琛
Owner GUANGZHOU HUAXIN ELECTRONICS TECH