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一、概述采样保持器是由指令进行控制对模拟信号进行采样或保持的一种电路,它是中速和高速模拟数字转换器必不可少的一个重要环节。有了这个环节可以大大地提高转换器的跟踪速度。换言之,即在相同的转换精度下容许信号有大得多的变化速率。这种电路还广泛用于模拟计算、采样示波器、信号再生滤波、数字电压表、多路数字模拟转换器输出采样保持和高速数字模拟转换器去尖峰等场合。在不同的应用中对该电路有不同的性能要求,概括起来主要是对采样保持精度和速度的要求。在采样保
I. Overview Sample and hold is a circuit controlled by instructions to sample or hold an analog signal. It is an indispensable part of medium-speed and high-speed analog-digital converters. With this link can greatly improve the converter’s tracking speed. In other words, a much greater rate of change of the signal is allowed with the same conversion accuracy. This circuit is also widely used in analog computing, sampling oscilloscope, signal regeneration filter, digital voltmeter, multi-channel digital-analog converter output sample and hold and high-speed digital-analog converter to spike and other occasions. In different applications of the circuit have different performance requirements, summed up the main sample and hold accuracy and speed requirements. In sampling security