What is the relationship of pulse amplitude after sampling in flat top sampling?

In flat top sampling, the pulse amplitude maintains a constant value throughout the duration of the sample period. This characteristic means that once the sample is taken at a specific instant, the output remains stable and does not vary during the holding phase of the pulse. This constancy reflects the sampling method's design, where the amplitude is determined based on the signal value at the moment of sampling, ensuring that the output signal retains the sampled value until the next sampling instant.

This stability in amplitude facilitates easier reconstruction of the original signal when using a reconstruction filter or digital-to-analog converter since the flat top provides a clear and defined level for each sampling period. It stands in contrast to other sampling methods that may introduce variations throughout the pulse or utilize different criteria for determining the amplitude.