采样保持放大器的规范和架构

采样保持放大器的规范和架构Specifications and Architectures of Sample-and-Hold Amplifiers

Specifications and Architectures of Sampleand-Hold Amplifiers
I INTRODUCTION Sample-and-Hold (S H) amplifiers track an analog signal and when given a ‘‘hold’’ command they hold the value of the input signal at the instant when the ‘‘hold’’ command was issued thereby serving as an analog storage device An ideal S H amplifier would be able to track any kind of input signal and upon being given a hold command store at its output without delay the precise value of the signal and maintain this value indefinitely Unfortunately ideal S H amps do not yet exist and to be able to pick a S H amp to suit a particular application one must be familiar with how S H amps are characterized and how the S H specifications will affect performance