Sample And Hold
Abstract
Mostly the amplifiers that we use in analog are “continuous time” where the input signal is continuously available and applied to the circuit and the output signal is continuously observed. Video, audio and high speed analog systems are mostly based upon this. In many situations however, the input may be sensed only periodically while ignoring its value at other instants. A circuit hence called “discrete time” or “sampled data” system thus samples the input and produces a valid output at the end of each period (comprising a sample and hold phase). Sample and hold amplifiers therefore act as analog storage devices.
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 amplifiers don’t exist as......
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Approximate Word Count: 708
Approximate Pages: 3 (260 words per double-spaced page) |