What Exactly is a Low drift sample and hold?

  • Thread starter Ian_Brooks
  • Start date
  • #1
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Main Question or Discussion Point

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?
 

Answers and Replies

  • #2
4,239
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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.
 
  • #3
berkeman
Mentor
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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.
 
  • #4
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thanks
 

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