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What Exactly is a Low drift sample and hold?

  1. Jul 19, 2008 #1
    I realise a sample and hold is used in digital control whereby the circuit holds the analogue value steady for a short time while the converter or other following system performs some operation over that held time.

    However what does it mean by having low drift?
  2. jcsd
  3. Jul 20, 2008 #2
    You won't find anyone specifying a high drift sample and hold. It means the output doesn't change as much during the hold time as previously manufactured units in the same class.
  4. Jul 21, 2008 #3


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    Staff: Mentor

    For low drift, you need a capacitor with low leakage (easy), low dielectric absorption (need the right material), and you need a high-impedance input to the buffer amp in the S/H.
  5. Jul 22, 2008 #4
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