The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 2013
Filed:
Jun. 29, 2011
Brian J. Campbell, Cupertino, CA (US);
Vincent R. Von Kaenel, Palo Alto, CA (US);
Naveen Javarappa, San Jose, CA (US);
Greg M. Hess, Mountain View, CA (US);
Brian J. Campbell, Cupertino, CA (US);
Vincent R. von Kaenel, Palo Alto, CA (US);
Naveen Javarappa, San Jose, CA (US);
Greg M. Hess, Mountain View, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
In one embodiment, a level shifter circuit may include a shift stage that also embeds transistors that implement a logic operation on two or more inputs to the level shifter. At least one of the inputs may be sourced from circuitry that is powered by a different power supply than the level shifter and circuitry that receives the level shifter output. Additionally, the level shifter includes one or more dummy transistors that match transistors the perform the logic operation, to improve symmetry of the level shifter circuit. In some embodiments, certain design and layout rules may be applied to the level shifter circuit to limit variation in the symmetry over various manufacturing variations.