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Differential signal AD conversion circuit of multichannel sensor

A differential signal and conversion circuit technology, applied in the direction of physical parameter compensation/prevention, can solve the problems of large timing error and large temperature influence, and achieve the effects of accurate timing positioning, strong anti-interference ability, and small impact

Pending Publication Date: 2022-07-22
JIAXING JINGYAN INTELLIGENT EQUIP TECH
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  • Description
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AI Technical Summary

Problems solved by technology

Single-ended signals are judged by high and low threshold voltages, which are greatly affected by process and temperature. For low-amplitude signals, the timing error is large

Method used

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  • Differential signal AD conversion circuit of multichannel sensor
  • Differential signal AD conversion circuit of multichannel sensor
  • Differential signal AD conversion circuit of multichannel sensor

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Embodiment Construction

[0023] The specific embodiments of the multi-channel sensor differential signal AD conversion circuit of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] Referring to the accompanying drawings, the high-speed multi-channel differential signal AD conversion circuit of the present invention includes instrument operational amplifiers U1-U4, rail-to-rail operational amplifiers U5-U6, AD converter U7, and microcontroller U8.

[0025] The microcontroller U8 is connected to the AD converter U7, that is, the MOSI end of the microcontroller U8 is connected to the DIN pin of the AD converter U7, the SCLK end of the microcontroller U8 is connected to the SCK pin of the AD converter U7, and the microcontroller U8 is connected to the SCK pin of the AD converter U7. The MISO end of the device U8 is connected with the SDO pin of the AD converter U7, and the CONV end of the microcontroller U8 is connected with the CNV pin of the AD c...

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Abstract

The invention relates to the technical field of sensor signal processing, in particular to a multichannel sensor differential signal AD conversion circuit which comprises four instrument operational amplifiers, two rail-to-rail operational amplifiers, an AD converter and a microcontroller, the microcontroller is in control connection with the AD converter, an external sensor outputs two signals, one signal is the same as an original signal in phase, and the other signal is the same as an original signal in phase. One signal is opposite to the original signal. The differential signal has strong common-mode interference resistance, is suitable for long-distance transmission, realizes a high-speed multi-channel stable conversion function, and can be used in the application field needing high-speed multi-channel differential signal AD conversion.

Description

technical field [0001] The invention relates to the technical field of sensor signal processing, in particular to a multi-channel sensor differential signal AD conversion circuit. Background technique [0002] The sensor analog output signal types mainly include single-ended signal, pseudo differential signal and differential signal. Most applications are to collect single-ended signals of sensor analog quantities for AD conversion. When the single-ended input line changes, GND does not change, so the voltage difference changes greatly. Single-ended signals rely on two threshold voltages, high and low, and are greatly affected by process and temperature. For low-amplitude signals, the timing error is large. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to solve the above problems, and provide a multi-channel sensor differential signal AD conversion circuit, which can realize the high-speed multi-channel stable conversion function, and can be u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/08
CPCH03M1/08H03M1/0827H03M1/089H03M1/1205H03M1/124
Inventor 卢志浩
Owner JIAXING JINGYAN INTELLIGENT EQUIP TECH
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