High-precision analog-to-digital converter

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 ...

AI Technical Summary

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.

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