本文關(guān)鍵詞：一款高性能開關(guān)電源芯片的修調(diào)方案分析與設(shè)計　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 修調(diào) 熔絲 反熔絲 開關(guān)電源芯片

【摘要】：對于模擬電路,芯片一經(jīng)流片,電路的相關(guān)特性就已確定而無法更改。然而,受到工藝環(huán)境等非理想因素影響,一些參數(shù)并不符合設(shè)計預(yù)期,導(dǎo)致流片后芯片的精度及性能與預(yù)期相差甚遠。為了彌補電路設(shè)計期望與芯片最終性能之間的差距,近年來,針對大規(guī)模集成電路的修調(diào)技術(shù)不斷得到發(fā)展。與此同時,開關(guān)電源芯片也正朝著高性能、高精度、小體積以及低成本的方向發(fā)展,因此采用合適的修調(diào)手段對電源芯片進行修調(diào)十分必要。本論文針對一款開關(guān)電源芯片設(shè)計項目,為芯片制定修調(diào)方案并完成電路設(shè)計。論文首先對修調(diào)的原理、作用以及幾種常用的修調(diào)方法進行了介紹。之后,文章介紹了本開關(guān)電源芯片的特點、內(nèi)部結(jié)構(gòu)以及典型應(yīng)用。根據(jù)芯片的特點及結(jié)構(gòu),找出容易受工藝影響的關(guān)鍵參數(shù),并在相關(guān)的電路中加入修調(diào)電路。針對本芯片,本文設(shè)計了兩種不同的修調(diào)方案。本文首先設(shè)計了一種金屬熔絲修調(diào)方案。金屬熔絲修調(diào)的好處是成本低廉,并且與標準工藝兼容性極佳。本文完成了這一方案的電路設(shè)計,并通過模擬熔絲通斷狀態(tài)對電路進行仿真,驗證了電路功能的正確性。由于金屬熔絲修調(diào)在封裝之前進行,無法避免封裝給芯片造成的影響,因此,本文設(shè)計了另一種更為精確的修調(diào)方案——二極管反熔絲修調(diào)方案。二極管修調(diào)可以在封裝后進行,因此修調(diào)精度更高。然而,通常情況下,芯片封裝后修調(diào)只能利用芯片為正常應(yīng)用而設(shè)計的引腳完成。根據(jù)這一特點,本文僅利用芯片的6個功能引腳,完成修調(diào)方案的電路設(shè)計。在該方案中,本文還針對芯片重要參數(shù),進行了“預(yù)修調(diào)”的電路設(shè)計,即在不破壞熔絲的情況下,模擬熔絲狀態(tài)改變后對相關(guān)電路參數(shù)變化的影響。通過預(yù)修調(diào),找出最佳的修調(diào)組合,之后再對相應(yīng)的熔絲進行修調(diào)操作。通過對電路的功能進行仿真,驗證了電路設(shè)計的正確性。文章最后對兩種修調(diào)方式進行了比較,上述兩種方案各有優(yōu)缺點,方案的選擇需要綜合考慮工藝條件、精度要求以及成本等因素。
[Abstract]:For analog circuits, once the chip flow chip, the circuit characteristics have been determined and can not be changed. However, due to the process environment and other non-ideal factors, some parameters do not meet the design expectations. In order to make up for the gap between the design expectation and the final performance of the chip, the precision and performance of the chip behind the chip are far from expected in recent years. At the same time, switching power supply chips are developing towards high performance, high precision, small volume and low cost. Therefore, it is necessary to modify the power supply chip by the appropriate adjustment means. This paper aims at a switch power supply chip design project. Firstly, this paper introduces the principle, function and several common modification methods of the modification. Then, this paper introduces the characteristics of the switch power supply chip. Internal structure and typical applications. According to the characteristics and structure of the chip, find out the key parameters easy to be affected by the process, and add the correction circuit to the related circuit. In this paper, two different modification schemes are designed. Firstly, a metal fuse modification scheme is designed. The advantages of metal fuse modification are low cost. And the compatibility with the standard process is very good. This paper completes the circuit design of this scheme, and simulates the circuit by simulating the fuse on-off state. The correctness of the circuit function is verified. Because the metal fuse is modified before the package, it is impossible to avoid the impact of the package on the chip. In this paper, another more precise modification scheme, diode anti-fuse modification, is designed. Diode modification can be carried out after packaging, so the modification accuracy is higher. However, in general, it is more accurate. Only the pin designed for normal application can be used to complete the modification after chip packaging. According to this characteristic, this paper only uses the six functional pins of the chip to complete the circuit design of the modification scheme. According to the important parameters of the chip, the circuit design of "pre-trimming" is carried out, that is, without destroying the fuse, the influence of the change of the fuse state on the change of the related circuit parameters is simulated. Find out the best adjustment combination, and then adjust the corresponding fuse operation. Through the simulation of the circuit function, verify the correctness of the circuit design. Finally, the two modification methods are compared. The above two schemes have their own advantages and disadvantages, and the selection of the scheme needs to consider the process conditions, precision requirements and cost factors.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN86

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本文編號：1389608