基于COS集成电路来实现电容测试仪的设计.docVIP

摘 要 本课题的设计电路主要采用CMOS集成电路来实现电容测试仪的设计。电容测试仪主要由时钟振荡电路，控制电路，闸门电路，计数电路，译码驱动电路和显示电路六部分组成。它的核心思想就是利用单稳态触发器的暂态的时间来控制多谐振荡器的输出的脉冲的个数,然后通过七段数码管译码驱动显示。 本课题主要研究的是电容测试仪的精度和可靠性。电容测试仪可以测量三位数字显示，量程可达到1到999，测量时间小于等于2秒，精度可达到±10％。测量电容值的精度高，成本较低，而且维修方便，应用也比较广泛。 关键词 测试仪；单稳态触发器；多谐振荡器；译码驱动显示电路 Abstract Now,electronics technique of development very quick, Gao Xins technique change with each passing day.Especially appropriation integrated circuit design technique of gradually progress with perfect, currently numeral electronics technique already broadly application at the calculator, auto control, electronics measure each realms such as appearance and correspondence etc.The history current continuously flow out to move,electronics science technique of continuously development,more and more of electronics product application in our daily lifes,The electronics product has already become the need of our consumer,but the topic of this topic is a simple electric capacity test instrument. Also measure instrument with many electronics in the teaching,this topic be main research of is an electric capacity test instrument of accuracy and credibility.The design of this topic work credibility, measure electric capacity value of accuracy Gao, the cost be lower, and maintain convenience.This topic is main adoption CMOS integrated circuit to come to realization electric capacity test instrument of design, electric capacity test instrument main is flap by the clock to concuss electric circuit, control electric circuit, gateway electric circuit, count electric circuit, translate code to drive electric circuit and manifestation electric circuit six part constitute.Can keep a display of view to be measured permit of electric capacity a value.Numeral measure appearance not only ratio imitate diagraph appearance accuracy Gao,the function be strong, and easy realization measure instrument of the intelligence turn.Particularly is medium,large-scale with super large scale integration of development, numeral elect