一、采样保持器的作用采样保持器(Sample/Hold)简称 S/H 电路,是各种电子仪器仪表、微型计算机化检测和控制设备中常用的一种器件。它能在某一个逻辑电平的控制下对输入信号进行瞬时采样,又在另一个逻辑电平的控制下,把这一瞬间输入的信号保存下来以供后面电路环节使用。这一信号瞬间跟踪和存贮的独特性质特别适用于多路快速数据测量和信号输出系统。S/H 电路常用于构成高输入阻抗、低零漂的输入放大器。它能自动补偿直流放大器的失调和漂移,从而大大地提高了仪器仪表的精确度。随着微型计算机应用的日益普及,用来采集数据的集成逐次近似 A/D 转换器的使用也日趋广泛。这 First, the role of sample and hold Sample and Hold (Sample / Hold) referred to as S / H circuit, is a variety of electronic instruments, micro-computerized detection and control devices commonly used in a device. It can instantaneously sample the input signal under the control of a certain logic level, and save the signal input this moment under the control of another logic level for the later circuit. The unique property of instantaneous tracking and storage of this signal is particularly suitable for multiple fast data measurement and signal output systems. S / H circuit is commonly used to form a high input impedance, low-zero input amplifier. It can automatically compensate for the DC amplifier offset and drift, thereby greatly improving the accuracy of instrumentation. As microcomputer applications become more widespread, the use of integrated successive approximation A / D converters for data acquisition is also becoming more widespread. This