【英语】THE FISHERMAN AND THE GENIE

故事讲述了一位老渔夫在海中捕获了一个瓶子,里面封印着一位神魔。神魔承诺给予财富与权力,但因渔夫的聪明才智,最终将其重新封印。

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Once upon a time there was an old fisherman. He went fishing very early every morning, but he never cast his net more than four times a day.
One morning, he went out early to the sea. He cast his net for the first time, and drew in the body of an animal. He cast it a second time, and drew in an old basket full of sand. He cast it a third time, and drew in a lot of stones. It seemed he would have nothing to take home that morning.
Day had now broken, and he cast his net for last time. After some time, he began to draw the net in. He found it was very heavy. But there were not any fish in it. Instead he found a jar with a lid. He shook the jar, but could hear nothing. So he took off the lid and looked inside. He could see nothing. After a while a light smoke came slowly out of the jar. Then little by little, the smoke  gre w heavier and thicker till finally it turned into a terrible Genie!
"Get down on your knees," said the Genie, "for I'm going to kill you."
"Why? Didn't I set you free from the jar?"
"That's why I'm going to kill you, but I'll let you choose how you're going to die."
"But why?"
"Listen, and I will tell you my story."
"I was one of the spirits in heaven. But I did not want to obey Solomon's orders. So one day, he put me in this jar and threw it into the sea.
"During the first hundred years of my stay in the sea, I made a promise that if anyone set me free I would make him very rich. But no one came. During the second hundred years, I promised that if anyone set me free I would show him all the treasures in the world. But still no one came. During the third hundred years, I promised that if anyone came to set me free, I would make him king over the earth.
"Still no one came. Then I  bec ame very angry, and decided that if anyone should set me free I would kill him at once. Now you have come and set me free. So you must die, but I will let you say how you want to die."
The fisherman was not frightened. He said: "Since I must die, I must. But before I die, answer me one question."
"All right, but be quick."
"Were you really in the jar? You are so big and the jar is so small that it could hardly hold one of your feet."
"Of course I was in the jar. Don't you believe me?"
"No, and I won't until I've seen you in the jar with my own eyes."

When he heard this, the Genie changed into smoke. Slowly the smoke went back into the jar. When all of it was in the jar, the fisherman quickly put the lid on and threw it back into the sea. 


内容概要:本文档详细介绍了Analog Devices公司生产的AD8436真均方根-直流(RMS-to-DC)转换器的技术细节及其应用场景。AD8436由三个独立模块构成:轨到轨FET输入放大器、高动态范围均方根计算内核和精密轨到轨输出放大器。该器件不仅体积小巧、功耗低,而且具有广泛的输入电压范围和快速响应特性。文档涵盖了AD8436的工作原理、配置选项、外部组件选择(如电容)、增益调节、单电源供电、电流互感器配置、接地故障检测、三相电源监测等方面的内容。此外,还特别强调了PCB设计注意事项和误差源分析,旨在帮助工程师更好地理解和应用这款高性能的RMS-DC转换器。 适合人群:从事模拟电路设计的专业工程师和技术人员,尤其是那些需要精确测量交流电信号均方根值的应用开发者。 使用场景及目标:①用于工业自动化、医疗设备、电力监控等领域,实现对交流电压或电流的精准测量;②适用于手持式数字万用表及其他便携式仪器仪表,提供高效的单电源解决方案;③在电流互感器配置中,用于检测微小的电流变化,保障电气安全;④应用于三相电力系统监控,优化建立时间和转换精度。 其他说明:为了确保最佳性能,文档推荐使用高质量的电容器件,并给出了详细的PCB布局指导。同时提醒用户关注电介质吸收和泄漏电流等因素对测量准确性的影响。
内容概要:本文档介绍了一种基于ADP5070 DC-DC开关稳压器、ADP7142和ADP7182 CMOS LDO线性稳压器、LC滤波器及电阻分压器的电路设计方案,旨在为仅拥有5 V单电源的系统提供低噪声、双电源解决方案,以支持AD5761R双极性DAC的工作。AD5761R是一款16位双极性DAC,需要双电源来提供双极性输出电压范围。文中详细描述了如何配置该电路以适应单电源系统的应用,并展示了不同电源配置(包括外部电源、ADP5070和LC滤波器、ADP5070和LDO线性稳压器)下的性能测试结果,特别是频谱分析、输出电压噪声和交流性能等方面的数据。测试结果表明,增加LDO线性稳压器可以显著降低输出噪声,提升整体性能。 适合人群:从事精密仪器设计、数据采集系统开发的技术人员,尤其是那些需要理解和应用低噪声电源解决方案的专业人士。 使用场景及目标:适用于需要从单一5 V电源生成双电源的应用场合,如测试与测量设备、数据采集系统、执行器控制系统和工业自动化等领域。主要目标是在保证低噪声的前提下,确保AD5761R DAC能够在单电源环境中正常工作,提供高质量的双极性输出。 其他说明:本文档不仅提供了详细的电路配置指南,还通过大量的图表和数据分析验证了不同电源配置的效果。特别强调了在不同频率范围内,使用内部基准电压源和外部基准电压源(如ADR4525)对DAC输出噪声的影响。此外,文档还讨论了LC滤波器和LDO线性稳压器在减少开关纹波方面的作用,为实际应用提供了有价值的参考。
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