| 可编程数字控制精密延时电路设计 |
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| 引用本文： | 马凯,;王彦文. 可编程数字控制精密延时电路设计[J]. 中国测试技术, 2014, 0(1): 93-96 |
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| 作者姓名： | 马凯, 王彦文 |
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| 作者单位： | [1]徐州医学院医学信息学院,江苏徐州221004; [2]中国矿业大学(北京)机电与信息工程学院,北京100083 |
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| 基金项目： | 国家自然科学基金仪器重点项目（50927805） |
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| 摘 要： | 设计一种基于斜波式发生器原理可编程数字控制精密延时电路,用恒流源电路充放电和18位的DA转换器分别接入高速比较器的两端,DA转换器预先设定一电压基准,恒流源充电电容达到电压基准,高速比较器开始反转,形成一个触发脉冲信号,然后充电电容通过高速二极管快速放电重新计时。设计成18bit数字控制可编程动态范围2ps的采集时间间隔,提高采集信号的精度和频率。
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| 关 键 词： | 信号采集 等效采样 延时电路 |
Design of programmable digital control precision timing circuit |
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| Affiliation: | MA Kai, WANG Yan-wen (1. School of Medical Information Scienee,Xuzhou Medical C ollege,Xuzhou 221004,China; 2. Institute of Information ＆ Mechanical and Electronic Engineering,China University of Mining and Technology, Beijing 100083, China) |
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| Abstract: | A high precision programmable precision time circuit implementation method based ramp type is introduced. A constant current source circuit of charge and discharge and 18 bit DA converter are respectively connected with both ends of the high speed comparator. A reference voltage is .set by the DA converter, and the constant current source charges the capacitor to a voltage reference, then the high-speed eomparator begins to turn and forms a trigger pulse signal. After that, the charging capacitor fast discharges through the high-speed diode to prepare for the next recloeking. The acquisition precision is improved by the design to 18 bit 2 ps small acquisition time interval and a higher frequency signal can be sampled. |
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| Keywords: | signal sampling equivalent sampling delay time circuit |
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