This document describes a technique for digitally calibrating the current of a digitally controlled oscillator (DCO) to optimize its phase noise performance across process and temperature variations. The phase error (PHE) signal from a digital PLL is digitized and used to estimate the DCO's phase noise. By adjusting the DCO current digitally based on the estimated phase noise, the optimum operating point with minimum phase noise can be identified. Measurement results on a 90nm CMOS chip demonstrate good correlation between the estimated and measured DCO phase noise, validating the digital calibration approach.
This lesson covers conditional statements, iterative processing, and organizing efficient SAS code. Conditional statements like IF-THEN-ELSE are used to analyze data and create new variables based on conditions. Iterative processing with DO loops allows code to be repeated. Efficient coding orders conditional statements and uses DO loops appropriately to avoid errors and ensure accurate results.
Designing process of printed circuit boardselprocus
Most key element in electronic circuits and equipment’s is the Printed Circuit Board which connects electronic components with conductive lines printed
This document describes a technique for digitally calibrating the current of a digitally controlled oscillator (DCO) to optimize its phase noise performance across process and temperature variations. The phase error (PHE) signal from a digital PLL is digitized and used to estimate the DCO's phase noise. By adjusting the DCO current digitally based on the estimated phase noise, the optimum operating point with minimum phase noise can be identified. Measurement results on a 90nm CMOS chip demonstrate good correlation between the estimated and measured DCO phase noise, validating the digital calibration approach.
This lesson covers conditional statements, iterative processing, and organizing efficient SAS code. Conditional statements like IF-THEN-ELSE are used to analyze data and create new variables based on conditions. Iterative processing with DO loops allows code to be repeated. Efficient coding orders conditional statements and uses DO loops appropriately to avoid errors and ensure accurate results.
Designing process of printed circuit boardselprocus
Most key element in electronic circuits and equipment’s is the Printed Circuit Board which connects electronic components with conductive lines printed
10. 练习一
1. 下列物质中，属于纯净物的是（
）
A.自来水 B. 矿泉水 C. 井水 D. 蒸馏
水
2. 下列叙述正确的是（ ）
A. 淡水在自然界的分布很广，约占水的总储
量的 97.3 ％
B. 地球上的海水是混合物，淡水是纯净物
C. 由于水有自净能力，所以工业废水、农业
废水、生活污水的排放不会影响水质
D. 联合国规定了“世界水日”，让人们记住要
节约用水，保护好水资源
混合物
D
D
11. 3. 在自来水生产过程中加入消毒剂进行消毒杀菌
，常用的消毒剂是（ ）
A.明矾 B. 食盐 C. 氯气 D. 氢氧化
钙
4. 城市中的生活用水是经自来水厂净化处理过的
，其过程可表示为：取水→沉降→过滤→吸附→消毒
→供水。下列过程属于化学变化的是 ( )
A 、取水 B 、过滤 C 、消毒 D 、
供水
5. 水的污染主要来自于（ ）
① 天然水与土壤岩石长期接触 ② 工业三废的任
意排放 ③ 城市生活污水的大量排放
④ 水生植物的蔓延 ⑤ 农用化肥、农药使用不当
作用：凝聚
物理变
化
C
C
B
15. 练习二
1. 关于水的说法，正确的是（ ）
A.水由氢气和氧气组成
B. 水由氢元素和氧元素组成
C. 水由氢分子和氧原子构成
D. 水分子由氢氧元素组成
2. 对水通电生成氢气和氧气的实验，下列叙述中
错误的是（ ）
A. 生成体积小的气体可使带火星的木条复燃
B. 生成体积大的气体可以燃烧
C. 生成氢气与氧气的体积之比约为 2 ︰ 1 （同温
同压）
D. 连接外接电源正极的一端收集到的气体是氢气
正氧负
B
D
16. 3. 下列说法中，错误的是（ ）
A 通电后，水分子发生了变化，所以水的性质消失
B 水分子中氢原子和氧原子重新组合成氢分子和氧
分子
C. 水分子中的氢分子和氧分子分别重新聚合成氢气
和氧气
D. 水分子变成了氢分子和氧分子，原来的物质就变
成了新的物质
分子中不含分子
C
