Hold Circuits

Zero Order Hold

The majority of DACs have "zero order hold" in their output. After feeding the data into the DAC, the DAC output jumps to a new output voltage. The DAC holds that output voltage constant for the entire sampling time, until a new value is fed into the DAC and the DAC output jumps to that new value.

First Order Hold

Fractional Order Hold

Further reading

Wikipedia has related information at zero-order hold

Wikipedia has related information at first-order hold

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