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Title : MT-007: Aperture Time, Aperture Jitter, Aperture Delay Time – Removing the Confusion
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Date : 25-Mar-2009
Downloads : 51

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Perhaps the most misunderstood and misused ADC and sample-and-hold (or track-and-hold) specifications are those that include the word aperture. A simple model is shown in Figure 1, and the most essential dynamic property of a SHA is its ability to disconnect quickly the hold capacitor from the input buffer amplifier. Historically, the short (but non-zero) interval required for this action is called aperture time (or sampling aperture), ta. The actual value of the voltage that is held at the end of this interval is a function of both the input signal slew rate and the errors introduced by the switching operation itself.
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