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High matching current source layout for current rudder D/A converter

A technology of analog converter, current steering number

Inactive Publication Date: 2009-07-29
苏州通创微芯有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the layout of the current source array, due to the existence of process errors, there will be mismatch errors between the current sources at different positions, which will reduce the accuracy of the converter

Method used

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  • High matching current source layout for current rudder D/A converter
  • High matching current source layout for current rudder D/A converter
  • High matching current source layout for current rudder D/A converter

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Embodiment Construction

[0018] Hereinafter, the present invention will be specifically described by taking the thermometer-type current source layout of a 6-6 segmented current steering digital-to-analog converter using TSMC 0.18um technology and a power supply voltage of 1.8V as an example. Each thermometer-type current source 12 consists of 2 6 (km=2 6 ) sub-current sources 121 are connected in parallel, and are distributed in 32 (m=32, L=2) sub-arrays 11 in the array layout layout, and each sub-array distributes 2 sub-current sources 121, namely k=2.

[0019] As shown in Figure 2, taking the center of the array layout of the current source array 1 as the origin O, the errors related to process and thermal changes are approximately expressed as Taylor expressions:

[0020] i thermal，tech，... (x, y) = b 0 +b 1 x+b 2 y+b 3 xy+b 4 x 2 +b 5 the y 2 …(1)

[0021] Wherein, (x, y) are the coordinates of the sub-current source 121 in the array layout.

[0022] The spatial distribution of the ar...

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Abstract

The invention discloses a high matching current source layout used for a segmented current-steering digital-to-analog converter (DAC), wherein, the thermometer-type current-steering has important influence on the performance of the DAC and comprises a current source array consisting of n-1 (n is equal to 0, 1, 2, 3 ...) thermometer-type current sources, the current source array is arranged into m (m is equal to 0, 1, 2, 3 ...) sub-arrays, the sub-arrays of the current source array are symmetric along the x axis and the y axis of the whole array territory, and provided with axisymmetric arrangement structure along the x' axis and the y' axis of the quadrant in each subdivided quadrant. The current source array adopts the double central symmetric structure, which can inhibit the odd technical error, and reduce the even error. The arrangement has the characteristics of small sub-array surface and small technical error change in the area, so that all the current sources are influenced by almost the same technologic errors, and the matching between the current sources and the precision of the DAC are greatly improved.

Description

technical field [0001] The invention relates to a highly matching current source layout for a current steering digital-to-analog converter; the invention also relates to a thermometer-type current source array layout of a segmented current steering analog-to-digital converter. Background technique [0002] Due to the strong anti-interference ability, high stability, high integration, flexibility, and portability of digital technology, the characteristics of digital signal processing can easily realize various advanced adaptive digital algorithms, and then complete analog circuits. Functions that cannot be realized, therefore, more and more analog signal processing is being replaced by digital technology. However, the real world is a world of analog signals, so it is necessary to restore the processed digital signals to analog signals in the real world. This conversion process is called digital-to-analog conversion (DAC). Digital-to-analog converters are an important interfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
Inventor 张建玲
Owner 苏州通创微芯有限公司
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