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Resistance type DAC layout structure

A resistance structure, layout structure technology, applied in the direction of electrical digital data processing, CAD circuit design, special data processing applications, etc., can solve the problem of difficulty in improving the accuracy, and achieve the effect of improving accuracy

Pending Publication Date: 2022-04-08
SHANGHAI HUALI INTEGRATED CIRCUTE MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a resistive DAC layout structure, which is used to solve the problem of parasitic and matching in the layout design of the existing R-2R structure DAC design in the prior art. and other factors, so its accuracy is difficult to improve

Method used

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Embodiment 1

[0045] The present invention provides a resistive DAC layout structure, comprising the following figures (wherein the following various structures are figures in the layout design):

[0046] A resistance structure, the resistance structure includes a plurality of first sub-resistance structures 11 and at least one second sub-resistance structure 12 electrically connected, the number of the first sub-resistance structures 11 is determined by the number of bits in the binary number in the actual design, a multi-bit The numerical value represented by 1 of each bit in the binary number is called the weight of this bit;

[0047] In an optional implementation manner, both the first sub-resistance structure 11 and the second sub-resistance structure 12 are arranged in an S shape.

[0048] Wherein the plurality of first sub-resistance structures 11 are formed by connecting a plurality of third resistors 3 in series, and the plurality of first sub-resistance structures 11 are arranged ...

Embodiment 2

[0059] In an alternative implementation, see Figure three , the number of at least one second sub-resistance structure 12 is one.

[0060] In an optional implementation manner, in a plurality of adjacent first sub-resistance structures 11, one end of the metal wiring 2 is electrically connected to the first end of a second sub-resistance structure 12, and the metal wiring The other end of 2 is electrically connected to the second end of another adjacent first sub-resistance structure 11; in the adjacent first sub-resistance structure 11 and the second sub-resistance, one end of the metal wiring 2 is connected to the first The first end of the sub-resistor structure 11 is electrically connected, and the other end of the metal connection 2 is electrically connected to the two 2R structures in the second sub-resistor structure 12, and the overall structure formed by it is defined as the first arrangement layout structure.

Embodiment 3

[0062] In an alternative implementation, see Figure four , the number of at least one second sub-resistance structure 12 is two, which are respectively arranged on both sides of the plurality of sub-resistance structures, and the structure formed by them is defined as a second arrangement layout structure.

[0063] In another optional implementation manner, the second arrangement layout structure is a symmetrical mirror image structure, and metal wires 2 are connected in parallel between the symmetrical structures between the second arrangement layout layouts, so that the resistance value of the symmetrical structure after parallel connection is for 2R.

[0064] In another optional implementation manner, the method for making the resistance value of the symmetrical structure after parallel connection 2R includes: providing a symmetrically distributed first layout structure; replacing the resistance value in the R structure with 2R, and The resistance of the 2R structure is r...

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Abstract

The invention provides a resistive DAC layout structure which at least comprises a resistor structure. The resistor structure comprises a plurality of first sub-resistor structures and at least one second sub-resistor structure, wherein the first sub-resistor structures and the at least one second sub-resistor structure are electrically connected. Wherein the plurality of first sub-resistor structures are formed by connecting a plurality of third resistors in series, and the plurality of first sub-resistor structures are arranged regularly; the second sub-resistor structure is formed by connecting a plurality of third resistors in series, the number of third resistance values of the second sub-resistor structure is larger than that of the third resistors in the first sub-resistor structure, and the second sub-resistor structure is arranged on at least one side of the first sub-resistor structures; and the metal connecting wires are used for connecting the plurality of adjacent first sub-resistor structures and at least one second sub-resistor structure. According to the DAC, the influence of parasitic, matching and other factors in layout design on the precision is reduced, and differential nonlinearity and integral nonlinearity indexes of the DAC of the structure are effectively controlled within a certain resistance range.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a resistive DAC layout structure. Background technique [0002] DAC (Digital to Analog Converter) is a device that converts digital signals into analog signals and is widely used in digital circuits. The biggest limitation of resistive DAC (digital analog converter) is the challenge related to achieving high resolution and maintaining its linearity. The number of conventional resistor string DACs increases exponentially with the increase in resolution, and the R-2R structure ( figure 1 ) can directly solve this problem by adopting the ladder structure of binary weighted resistors, so that the required resistors are reduced from 2^n to about 3n. The R-2R structure is characterized by the resistance value of each node in the circuit looking to the right Both are 2R. [0003] However, the current R-2R structure is still limited by the matching accuracy in high-performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/3947G06F30/32
Inventor 顾静萍钱翼飞
Owner SHANGHAI HUALI INTEGRATED CIRCUTE MFG CO LTD
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