Trimming code generation circuit, trimming system and method based on successive approximation principle

A technology of successive approximation and circuit generation, which is applied in the field of trimming system and trimming code generation circuit, which can solve the problems such as inability to accurately obtain trimming codes, achieve the effects of reducing the number, avoiding accidental power-off, and reducing chip costs

Active Publication Date: 2021-07-30
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a trimming code generation circuit based on the successive approximation principle, a trimming system and a method thereof, which are used to solve the problems in the prior art through calculation methods or look-up tables. The problem that the method cannot accurately obtain the correction code

Method used

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  • Trimming code generation circuit, trimming system and method based on successive approximation principle
  • Trimming code generation circuit, trimming system and method based on successive approximation principle
  • Trimming code generation circuit, trimming system and method based on successive approximation principle

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Embodiment 1

[0071] Such as image 3 As shown, the present embodiment provides a trimming code generating circuit based on the principle of successive approximation. The trimming code generating circuit 10 includes: a voltage generating circuit 100, a comparator 200, and a trimming code generating unit 300. The trimming A code generating unit 300 is connected between the comparator 200 and the voltage generating circuit 100;

[0072] The trimming code generating unit 300 outputs a pre-modifying code (pbit0 to pbitn-1) to the voltage generating circuit 100, and the voltage generating circuit 100 outputs a pre-modifying code (pbit0 to pbitn-1) according to the preset Trimming voltage V XT to said comparator 200;

[0073] The comparator 200 compares the pre-trimming voltage V XT and reference voltage V REF and output a comparison result to the trimming code generating unit 300; and

[0074] Based on the first clock signal CLK1 and / or the comparison result, the trimming code generation un...

Embodiment 2

[0094] Such as Figure 7 As shown, the present embodiment provides a trimming system based on the principle of successive approximation, and the trimming system includes:

[0095] The trimming code generating circuit 10 as described in Embodiment 1 is used to generate and output a trimming code (bitn-1 to bit0);

[0096] The programming controller 20 is connected to the trimming code generation circuit 10, and is used to perform trimming operations on the N fuses according to the trimming codes (bitn-1 to bit0) and the second clock signal CLK2, so as to N fuses are state solidified.

[0097] As an example, such as Figure 8 As shown, the programming controller 20 includes: a single high level generating circuit 21, a trim enabling signal generating circuit 22 and N fuse trimming units 23, the trim enabling signal generating circuit 22 and The single high level generating circuit 21 is connected, and the N fuse trimming units 23 are respectively connected to the trimming ena...

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Abstract

The present invention provides a trimming code generating circuit, trimming system and method based on the principle of successive approximation, the trimming code generating circuit includes: a voltage generating circuit, a comparator, and a trimming code generating unit, and a trimming code generating unit Connected between the comparator and the voltage generating circuit; the trim code generating unit outputs the pre-trimmed code to the voltage generating circuit, and the voltage generating circuit outputs the pre-trimmed voltage to the comparator according to the pre-modified code; the comparator compares the pre-modified voltage and the reference voltage and output a comparison result to the trim code generation unit; and the trim code generation unit sequentially performs N trimming bits in the pre-modulation code from high to low based on the first clock signal and / or the comparison result Set trimming operation, and after each setting trimming operation, latch and output an N-bit pre-trimming code, and after the lowest trimming bit completes the setting trimming operation, generate an N-bit trimming code. The invention solves the problem that the trimming code cannot be accurately obtained through the existing calculation method or table look-up method.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a trim code generation circuit based on the successive approximation principle, a trim system and a method thereof. Background technique [0002] In the field of integrated circuits, due to the influence of the distribution of the process itself, the parameters of the produced chips will have a certain distribution. In applications that require parameter accuracy, it is necessary to use trimming methods to reduce the influence of parameter distribution and improve parameter accuracy. consistency to meet application requirements. Such as figure 1 and figure 2 As shown, the parameter value distribution is very wide before the trimming, but the parameter value concentration is greatly improved after the trimming. [0003] Currently known trimming methods mainly include electrical trimming, laser trimming, eFuse or EEROM code writing trimming. The trimming code trims the fuse....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11C29/02G11C29/00
CPCG11C29/028G11C29/78
Inventor 罗丙寅尤勇刘亚彬李国成
Owner CRM ICBG (WUXI) CO LTD
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