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Method of arrangement of current cell and curent cell array using such method

A cell array and current source technology, applied in electrical components, special data processing applications, CAD circuit design, etc., can solve problems such as complex wiring

Active Publication Date: 2011-11-09
TAIWAN SEMICON MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the layout disclosed by Austin can only be applied to a two-dimensional array of current source cells and requires complex wiring

Method used

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  • Method of arrangement of current cell and curent cell array using such method
  • Method of arrangement of current cell and curent cell array using such method
  • Method of arrangement of current cell and curent cell array using such method

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Embodiment Construction

[0029] The current source cell arrays and methods of forming the cell arrays disclosed herein provide improved matching of fingers in the array, and also reduce complexity compared to conventional arrays and methods of forming the arrays. This approach is applicable to any array of current source cells in one or more dimensions, which may contain more than three main groups, and each main group M has at least three subgroups S.

[0030] For the method of designing and manufacturing an improved current source cell array, please refer to figure 1 . In block 102, a current source cell array comprising a plurality of current source cells is provided.

[0031] In block 104 , a number N of main groups M is defined according to the number of applied current sources, where N is an integer greater than or equal to three. In block 106, for matching, each main group M' is selected to contain N fingers or N finger subgroups. In block 108, a plurality of location identifiers located in ...

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Abstract

The invention discloses a method of arrangement of a current cell and a curent cell array using such method. The curent cell array includes a number of current cell groups. Each of the current cell groups includes a number of current cells. In the method of arrangement of the current cell, firstly an initial current cell array is provided; then the current cells in the current cell array is divided into a plurality of current cell groups; a first identification code is assigned to each of the current cell groups and a second identification code is assigned to each of current cells, wherein the first and second identification codes are on the basis of a gradient of the initial current cell array; the current cells are arrayed based on the first and second identification codes to provide a layout of a final current cell array; sequently the layout of the final current cell array is in a computer readable memory medium.

Description

technical field [0001] The present invention relates to a current source digital-to-analog converter (DAC), in particular to a physical arrangement of current source cells in a current source cell array, which can provide a current-guided digital-to-analog conversion with improved accuracy device. Background technique [0002] Digital-to-analog converters (DACs) are widely used in integrated circuits (ICs). For example, digital-to-analog converters can be used in cellular base stations, test instruments, waveform generators, and wireless communication systems. A binary-weighted digital-to-analog converter (binary-weighted DAC) includes taps for receiving different binary-weighted currents and a series of switches connected to the taps. The opening and closing of the switch is controlled by the input code, which in turn controls the output current. [0003] Thermometer codes are applied to reduce the problem of transient glitch energy related to the switching of binary-wei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
CPCH03M1/742H03M1/0648G06F17/5063G06F30/36
Inventor 徐英智周文昇
Owner TAIWAN SEMICON MFG CO LTD
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