Signal acquisition circuit for silicon piezoresistive pressure sensor unit
A pressure sensor and acquisition circuit technology, applied in the field of signal acquisition circuits, can solve the problems of low accuracy and large sensor data acquisition errors, and achieves eliminating the influence of excitation voltage fluctuations, solving large data acquisition errors, eliminating excitation voltage drift. effect of noise
Inactive Publication Date: 2019-12-13
BEIJING AUTOMATION CONTROL EQUIP INST
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[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a signal acquisition circuit for a silicon piezoresistive pressure sensor unit, which can solve the problems of large sensor data acquisition errors and low precision in the prior art
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[0019] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details.
[0020] It should be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related to the solution according to the present invention are shown in the drawings, and the steps related to the present invention are omitted. Invent other details that don't really matter.
[0021] figure 1 A schematic block diagram of a signal acquisition circuit for a silicon piezoresistive pressure sensor unit provided by an embodiment o...
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The invention relates to the technical field of electronic devices, and discloses a signal acquisition circuit for a silicon piezoresistive pressure sensor unit. The acquisition circuit comprises a plurality of filters, a converter, a double operational amplifier and a power unit. The converter comprises a multiplexing conversion unit and an analog-to-digital conversion unit. Each pressure sensoris connected with one filter, and the filters are used for filtering output signals of the pressure sensors and outputting the output signals to the multiplexing conversion unit. The multiplexing conversion unit is used for carrying out channel switching on the filtered signals and switching and outputting the filtered signals to the double operational amplifier. The double operational amplifier is used for carrying out differential amplification on the filtered signals and outputting the signals to the analog-to-digital conversion unit. The analog-to-digital conversion unit is used for carrying out analog-to-digital conversion on the signals after differential amplification. The power unit is used for supplying power to the pressure sensors, the filters, the converter and the double operational amplifier. Therefore, the problems of large data acquisition error and low precision of sensors can be solved.
Description
technical field [0001] The invention relates to the technical field of electronic devices, in particular to a signal acquisition circuit for a silicon piezoresistive pressure sensor unit. Background technique [0002] In the practical application of existing pressure sensors, usually only a single-range pressure sensor is used to cover a relatively large range that needs to be tested. In this way, a pressure sensor with a single range and precision will be difficult to meet the application requirements for applications with higher precision requirements in the low-pressure section within a large range. [0003] In order to solve the above problems, two composite range pressure sensors with a large range and a small range can be used in parallel to collect the air pressure signal at the same time, for example, when it is within the range of the small range pressure sensor Signal data, when the range of the small-range pressure sensor is exceeded, the signal data of the large...
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IPC IPC(8): G01L1/18H03H11/04H03M1/12
CPCG01L1/18H03H11/04H03M1/1245
Inventor 韩士超柏楠朱晓谢耀
Owner BEIJING AUTOMATION CONTROL EQUIP INST