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Inverter voltage transfer curve from English Wikipedia.

VOH:  Output high - output above this mark is considered on  (1)
VOL:  Output low  - output below this mark is considered off (0)
VIH:  Input high - input at or above this mark will turn the device off
VIL:  Input low  - input at or below this mark will turn the device on
Vm:   Midpoint voltage - used for calculating noise margins, gain, and other parameters

I am the author (Nader Moussa). I constructed these data from a device I built for my ECE442 class at North Carolina State University. This is a voltage transfer curve used to analyze a digital inverter circuit. The data represent a general behavior for similar devices. Since I am the author, I release it to public domain.

我，本作品著作权人，释出本作品至公有领域。这适用于全世界。 在一些国家这可能不合法；如果是这样的话，那么： 我无条件地授予任何人以任何目的使用本作品的权利，除非这些条件是法律规定所必需的。

Uploaded for use in Lithuanian Wikipedia.

Audriusa 13:29, 5 March 2006 (UTC)