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Analog-digital converter

A digital conversion and analog signal technology, applied in the direction of analog-to-digital converter, analog/digital conversion, code conversion, etc., can solve the problems of increased error and inability to perform high-precision AD conversion, etc., to compress offset components and improve AD conversion accuracy, error reduction effect

Inactive Publication Date: 2012-04-25
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, although the existing algorithm ADC can control the circuit to the smallest scale through cyclic processing, the input conversion offset of the amplifying circuit, the capacity deviation of the capacitor, etc. will also overlap and increase with the cyclic processing, so the error will increase. , can not perform high-precision AD conversion and other problems

Method used

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  • Analog-digital converter
  • Analog-digital converter
  • Analog-digital converter

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Embodiment Construction

[0039] figure 1 A block diagram showing an embodiment of the present invention.

[0040]The analog-to-digital conversion device 100 of this embodiment includes a first sample-and-hold circuit 111 and a second sample-and-hold circuit 112, a differential amplifier circuit 113, a 1-bit analog-to-digital conversion circuit 114, a switching circuit 115, a controller 116, a reference voltage The generating circuit 117 and the clock generating circuit 118 thus constitute a so-called algorithmic analog-to-digital conversion circuit.

[0041] The first sample-and-hold circuit 111 is composed of capacitors C1 to C4 and is connected to the switching circuit 115 . Capacitor C1 is paired with capacitor C3 and is charged at the same potential. In addition, the capacitor C2 and the capacitor C4 form a pair, and are charged at the same potential. The pair of capacitors C1 and C3 and the pair of capacitors C2 and C4 are charged with mutually different polarities at the same timing.

[004...

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Abstract

An disclosed analog / digital conversion apparatus for converting an analog signal into digital data by cycling the analog signal through a fully differential amplifier circuit includes a polarity switching unit configured to switch connection polarities of the fully differential amplifier circuit; and a control unit configured to control the polarity switching unit in such a manner that the connection polarities of the fully differential amplifier circuit are switched between a first signal cycle and second and subsequent signal cycles.

Description

technical field [0001] The present invention relates to an analog-to-digital conversion device, and more particularly to an analog-to-digital conversion circuit for converting an analog signal into a digital signal by circulating the signal in a fully differential amplifier circuit. Background technique [0002] Analog-to-digital conversion devices include pipeline-type analog-to-digital converters (for example, Japanese Patent No. 3765797), and algorithmic analog-to-digital converters (Algorithmic A / D Converter) (for example, Japanese Patent No. 3046005). , Cyclic A / D Converter (for example, Japanese Patent Laid-Open No. 2004-357279) and the like. [0003] Among them, the arithmetic-type analog-to-digital converter and the loop-type analog-to-digital conversion circuit can make the circuit scale relatively small, so they are suitable for reducing the area of ​​an integrated circuit (IC). [0004] Figure 13 It is a structural block diagram showing an example of a conventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/40H03M1/14
CPCH03M1/0607H03M1/0682H03M1/442H03M1/403
Inventor 井上文裕
Owner MITSUMI ELECTRIC CO LTD