Resources Contact Us Home
On-chip identification circuit incorporating pairs of conductors, each having an essentially random chance of being shorted together as a result of process variations

Image Number 5 for United States Patent #8291357.

Disclosed are embodiments of on-chip identification circuitry. In one embodiment, pairs of conductors (e.g., metal pads, vias, lines) are formed within one or more metallization layers. The distance between the conductors in each pair is predetermined so that, given known across chip line variations, there is a random chance (i.e., an approximately 50/50 chance) of a short. In another embodiment different masks form first conductors (e.g., metal lines separated by varying distances and having different widths) and second conductors (e.g., metal vias separated by varying distances and having equal widths). The first and second conductors alternate across the chip. Due to the different separation distances and widths of the first conductors, the different separation distances of the second conductors and, random mask alignment variations, each first conductor can short to up to two second conductors. In each embodiment the resulting pattern of shorts and opens, can be used as an on-chip identifier or private key.

  Recently Added Patents
Complete context search system
Superconducting magnetizer
Apparatus and methods for color displays
Mobile communication apparatus
Latch-up free ESD protection
Focus detection device and imaging apparatus having the same
  Randomly Featured Patents
Fluorescent lamp
Magnetic field sensor using microelectromechanical system
Pendent lamp
Stacked confetti
Beverage glass sleeve
Male asparagus hybrid plant `NJ953`
Well tool dislodgement apparatus
Vacuum cup construction
Rod holding adapter for a cantilever bracket
Synergistic mixtures of C6- to C12-alkanediols and tropolone (derivatives)