Notes on Digital Signal Processing: Practical Recipes for Design, Analysis and Implementation

Note 7. Instantaneous Sampling

In instantaneous sampling, the value of the analog signal is captured at the sampling instant and held constant for the duration of the sample pulse, as shown in Figure 7.1. Instantaneous sampling is sometimes called “flat-topped” sampling or zero-order-data-hold sampling.

Figure 7.1. In instantaneous sampling, the amplitude of each sample remains constant over its width.

Instantaneous sampling is mathematically equivalent to convolving a single rectangular sampling pulse with an ideally sampled version of the original signal. Therefore, the spectrum of an instantaneously sampled signal can be determined by multiplying ...