| 一种电流自校准14位、50Msample/s CMOS DAC |
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| 引用本文： | 朱臻,洪志良,黄秋庭.一种电流自校准14位、50Msample/s CMOS DAC[J].电子学报,2003,31(2):306-308. |
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| 作者姓名： | 朱臻 洪志良 黄秋庭 |
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| 作者单位： | 1. 复旦大学集成电路设计实验室,上海 200433;2. 苏黎士高等理工大学系统集成研究所,瑞士 苏黎士 |
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| 摘 要： | 文章介绍一种14位、50Msample/s的电流驱动型CMOS DAC.该电路的核心由31个温度计编码的高5位电流源、15个温度计编码的中间4位电流源和5个二进制编码的低5位电流源构成.为了达到更高的静态线性度,一种新颖的电流自校准技术被提出,用来对最高5位的电流源进行自校准.这种自校准完全是在后台操作的,并不需要一个替代电流源去替代正在被校准的那一路电流源.该芯片采用0.25μm标准CMOS工艺制造,芯片面积为3.54mm2.测试结果显示芯片的静态分辨率达到12位.
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| 关 键 词： | 自校准 温度计编码 二进制权重电流源 |
| 文章编号： | 0372-2112(2003)02-0306-03 |
| 收稿时间： | 2002-01-10 |
A Current Self-Trimming 14 bit 50MS/s CMOS DAC |
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| Clemens Hammerschmied.A Current Self-Trimming 14 bit 50MS/s CMOS DAC[J].Acta Electronica Sinica,2003,31(2):306-308. |
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| Authors: | Clemens Hammerschmied |
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| Affiliation: | 1. Laboratories of Integrated Circuit Design,Fudan University,Shanghai 200433,China;2. Institute of Integration of System,Swiss Federal Institute of Technology,Zurich,Switzerland |
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| Abstract: | A 14 bit,50MS/s current CMOS DAC is introduced.The DAC core is composed of an array of 31 thermometer-coded MSB current sources,15 thermometer-coded upper LSB (ULSB) current sources,and 5 binary-coded lower LSB (LLSB) current sources.Moreover the 5 MSB has a background self-trimming to meet high resolution.The new analog self-trimming technique introduced here does not need a replacement to replace the self-trimmed one.The circuit was fabricated in a 0.25μm CMOS technology.The die area is 3.54mm2.The measured results have shown that the circuit has more than 12 bit static resolution. |
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| Keywords: | self trimming thermometer coding binary weight ladder |
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