What "100 mV Step with 100 mV Overdrive" mean?

chang830 · May 17, 2007

Hi,
I found there is a specification of "response time" or "rise time" with the test condition of "100 mV Step with 100 mV Overdrive" in the datasheet of the comparator.

Anyone would pls. tell me what it mean?

Thanks

IanP · May 17, 2007

Usually it is 100mV step with 5-20mV overdrive ..

Step represents the voltage change necessary to switch the input differential stage fully from one state to the other ..

To understand what an overdrive is read the following quotation:

If the input voltage to a comparator is more positive than the reference voltage plus the offset—VOS (with zero reference, it’s just the offset) plus the required overdrive (due to limited gain and output nonlinearity), a voltage corresponding to logic “1” appears at the output. The output will be at logic “0” when the input is less than VOS and the required overdrive.

Comparator's specifications usually include graphs of response time for various input overdrives .. see picture below ..

Regards,
IanP

What "100 mV Step with 100 mV Overdrive" mean?

chang830

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IanP

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chang830

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What "100 mV Step with 100 mV Overdrive" mean?

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