In most sampling systems, the inherent characteristics of thesample-hold dictate its overall performance. However, oneerror source that sample-hold users do have under theirdirect control is the external charge injection from the digitalcontrol signal. This is known as charge transfer when measuredin coulombs or as charge offset when measured involts. It is often also known as pedestal because of itsmanifestation as a step change to the output. The culprit isgenerally the parasitic capacitance between the digital controlpin and some sensitive node(s) of the circuit.
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