Analog digital converter

a digital converter and analog technology, applied in the field of analog to digital converters, can solve the problem of requiring a certain amount of settling tim

Inactive Publication Date: 2010-05-27
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration enables accurate A / D conversion with reduced settling time and noise tolerance, allowing for faster conversion cycles and improved accuracy by minimizing the need for repeated sampling and accumulating noise.

Problems solved by technology

However, even using this method, the problem still remains that sampling is still necessary to output a residual signal to a subsequent stage, and a certain amount of settling time is required.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

Connection Relationships of First Embodiment

[0042]Next, connection relationships of respective devices will be described.

[0043]A common connection is established between one end of the switch 21 and one end of the switch 22, and this common connection point is connected to one end of the first capacitor 10. The switch 21 performs an ON / OFF operation between the external input terminal 1 and the one end of the first capacitor 10. The switch 22 performs an ON / OFF operation between the one end of the first capacitor 10 and the output terminal of the operational amplifier 5. The remaining end of the first capacitor 10 is connected to the input terminal (−) of the operational amplifier 5.

[0044]A common connection is established between one ends of the switches 23 to 27, and this common connection point is connected to one end of the second capacitor 11. The switch 23 performs an ON / OFF operation between the positive reference voltage +Vref and the one end of the second capacitor 11. The ...

second embodiment

Variation of Second Embodiment

[0147]In this embodiment, an example of the A / D converter with 5 bit output has been presented, in which a conversion to a digital value is repeated four times using an A / D converter. However, as in the first embodiment, the capacitance of a capacitor of the capacitor group 7, the number of capacitors thereof, and the number of A / D converters may be changed so that this embodiment can be applied to an A / D converter, an output of which is not in 5 bits.

[0148]In this embodiment, five capacitor networks have been used, but any other number of capacitor networks can be used. At this time, the number of sampling units is one, and sampling units and A / D converters are configured so that the sum of the numbers of sampling units and A / D converters is equal to the number of capacitor networks.

Other Embodiments

[0149]By changing a redundancy of a sub-A / D converter, the first and second embodiments can be also applied to an A / D converter with a redundancy being oth...

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Abstract

In one aspect, provided is an A / D converter including: a plurality of capacitor networks each including a first switch group; a capacitor group; a second switch group; and a plurality of reference voltage selectors; a sampling unit grounded at one end thereof; a plurality of A / D converters; and converting means; and a plurality of switch networks each of which connects a corresponding one of the plurality of the capacitor networks to any one of the sampling unit and the plurality of A / D converters in one-to-one correspondence, and in which converter the switch networks change the connections between the plurality of capacitor networks, the sampling unit and the plurality of A / D converters, at each predetermined time intervals, so that a pipeline operation is performed.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation of application Ser. No. 12 / 019,020 filed on Jan. 24, 2008, which is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2007-14866, filed Jan. 25, 2007, the entire contents of both of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an analog-to-digital converter for converting an analog signal into a digital signal.[0004]2. Description of the Related Art[0005]As analog-to-digital converters (hereinafter, referred to as “A / D converters”) converting analog signals into digital signals, a pipeline A / D converter has been known, which performs an analog to digital conversion (hereinafter, referred to as an “A / D conversion”) in each stage while sending signals in pipeline to subsequent stages (see, for example, Japanese Patent Laid-Open No. 2004-214905)[0006]Further, a cyclic A / D...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H03M1/36
CPCH03M1/0695H03M1/403H03M1/1215
InventorSAKURAI, SATOSHI
OwnerKK TOSHIBA