Logic circuit having dummy MOS transistor

Details Logic circuit having dummy MOS transistor Logic circuit having dummy MOS transistor

1998-10-07

2000-10-24

Tokar, Michael

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Field-effect transistor

326 8, 326120, H03K 19094

Patent

active

061373184

ABSTRACT:
A constantly conductive MOS transistor is placed in a logic circuit including a plurality of switching MOS transistors. The switching MOS transistors and the constantly conductive MOS transistor are connected in series and each receive a control signal at their respective gates. The constantly conductive transistor is in a conductive state regardless of the state of its control signal. Thus, it is difficult for a third party to learn the true logic structure of the logic circuit by visual inspection, as the third party will tend to recognize the constantly conductive transistor as a true transistor contributing to the logic circuit, and not as a constantly conductive "dummy" transistor.

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