A grading amplifier circuit and multifunctional data acquisition card

A technology of data acquisition card and amplifying circuit, applied in the direction of power amplifier, DC-coupled DC amplifier, etc., can solve the problems of inability to realize signal reduction, data acquisition card can not achieve large range and high scanning speed at the same time, and reduce the response speed. requirements, improve the IO buffer capacity, and improve the effect of the acquisition accuracy

Active Publication Date: 2011-12-14
陕西海泰电子有限责任公司
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Problems solved by technology

[0004] One of the purposes of the present invention is to propose a hierarchical amplifier circuit using two-stage processing, which solves the technical problem that the existing instrument amplifier circuit only performs signal amplification and cannot realize signal reduction
[0005] The second object of the present invention is to propose a high-speed scanning, large cache, and high-precision multifunctional data acquisition card using a hierarchical amplification circuit, which solves the technical problem that the existing data acquisition card cannot simultaneously realize large range and high scanning speed

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  • A grading amplifier circuit and multifunctional data acquisition card
  • A grading amplifier circuit and multifunctional data acquisition card
  • A grading amplifier circuit and multifunctional data acquisition card

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Embodiment Construction

[0027] see figure 1 , the multifunctional data acquisition card of the present invention is mainly made up of analog input unit, analog output unit, digital IO unit, FPGA unit, memory, PCI interface and power supply, is a kind of multifunctional data acquisition card based on PXI or PCI bus, adopts FPGA The overall structure of unit (programmable controller) + PCI bridge + memory + peripheral equipment. Among them: the FPGA unit adopts the chip XC3S1500, which realizes the control of peripheral equipment (including analog input unit, analog output unit, digital IO unit), timing counter, memory control, communication control of PCI interface chip and other functions; the FPGA unit adopts PCI 9054 chip to Realize the PXI / PCI interface function, convert the PCI bus into a local bus; the FPGA unit is connected to the IO interface 6 through the input and output unit; the PCI interface FPGA unit is connected to the memory, and the memory adopts a single-chip large-capacity SDRAM chi...

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Abstract

The invention relates to a graded amplifying circuit and a multifunctional data acquisition card using the graded amplifying circuit. The analog input unit of the multi-function data acquisition card adopts a hierarchical amplification circuit. The first stage uses three operational amplifiers to achieve high impedance and high common-mode rejection performance. The second stage uses operational amplifiers plus multiplexers to achieve multi-level switching signal amplification or Zoom out function. The invention solves the technical problems that the existing instrument amplifying circuit only performs signal amplification but cannot realize signal reduction, and the existing data acquisition card cannot simultaneously realize large range and high scanning speed. It has the advantages of multiple functions and wide application range, and can Simultaneously achieve high precision and high scan rate requirements of 1MHz, and can achieve large-capacity data cache function.

Description

technical field [0001] The present invention relates to an amplifying circuit, in particular to an amplifying circuit for hierarchical processing; the present invention also relates to a data acquisition circuit, in particular to a data acquisition circuit based on a PXI or PCI bus. Background technique [0002] At present, domestic data acquisition cards based on scanning mode have a single function, and the scanning frequency of the existing 16-bit precision multi-function cards is lower than 1MSa / s, and the on-board cache is small. With the rapid development of modern science and technology, especially in aerospace and military fields, the sampling accuracy and speed requirements for multi-function scanning acquisition are also getting higher and higher. In this case, the development of high-speed and high-precision multi-function data acquisition card has a good application prospect. [0003] Existing data acquisition cards use a scanning method to realize time-sharing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/20H03F3/34
Inventor 郭恩全石建华石俊斌李小杰苗胜赵涛
Owner 陕西海泰电子有限责任公司
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