High-precision analog-to-digital converter

A technology of analog-to-digital converters and digital-to-analog converters, applied in the direction of analog-to-digital converters, can solve the problems of high manufacturing cost, difficult design, and bulky volume, and achieve the effects of simplified overall design, small volume, and simple operation

Inactive Publication Date: 2014-11-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it has excellent precision performance, its sampling rate is very low, and the circuit is composed of a large number of discrete components, which makes it difficult to design, high in manufacturing cost, and bulky.

Method used

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  • High-precision analog-to-digital converter

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Embodiment Construction

[0011] The present invention is described in detail below in conjunction with accompanying drawing

[0012] Such as figure 1 As shown, the high-precision analog-to-digital converter of the present invention includes a first voltage follower 101, a second voltage follower 102, a digital-to-analog converter 103, an analog-to-digital converter 104, a control logic module 105, and a single-pole double-throw analog switch 106, first resistor 110, second resistor 111, third resistor 112, fourth resistor 113, fifth resistor 114, operational amplifier 115 and instrumentation amplifier 116; digital-to-analog converter 103 and analog-to-digital converter 104 and control logic module 105 interconnection; the input terminal of the analog-to-digital converter 104 is connected to the output terminal and the reverse input terminal of the second voltage follower 102; the control terminal of the SPDT analog switch 106 is connected to the control logic module 105, and the moving contact of the ...

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Abstract

The invention belongs to the technical field of electronic circuits, and particularly relates to a high-precision analog-to-digital converter. According to the high-precision analog-to-digital converter, a voltage measurement part is formed by sequentially connecting a second voltage follower 102 and an analog-to-digital converter body 104; a voltage generation part is formed by sequentially connecting a digital-to-analog converter 103 and a first voltage follower 101; a subtraction operation circuit 108 is composed of a first resistor 110, a second resistor 111, a third resistor 112, a fourth resistor 113 and an operational amplifier 115; a voltage amplifier 109 is composed of a fifth resistor 114 and an instrumentation amplifier 116; a residual voltage discharge part is composed of the subtraction operation circuit 108 and the voltage amplifier 109. The high-precision analog-to-digital converter has the advantages that the 20-bit resolution ratio, the 1-MHZ sampling rate and the 1-LSB maximum integration nonlinearity can be achieved, the full-range switching error is smaller than 1 ppm, and the converter can be applied to 6.5-bit digital multimeters and can be applied to high-precision digital collectors and high-end instruments and meters high in the requirement for the high sampling speed.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a high-precision analog-to-digital converter. Background technique [0002] With the continuous development of semiconductor technology, digital signal processing technology and measurement technology, the number of analog-to-digital converter products is increasing rapidly, and the product types are constantly enriching. The analog-to-digital converter is the conversion of analog signals and digital signals, and is the most basic and important part of modern digital measurement technology. From the design of the first analog-to-digital converter by Bell Labs in the 1950s to today's various types of analog-to-digital converters, they have also undergone changes from discrete components to large-scale integration. [0003] However, the accuracy level of commercially integrated high-resolution analog-to-digital converters limits their use in many precision ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 鲍景富汪帆张元玮鲍飞鸿朱亚军邓迪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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