Electronic digital logic circuitry – Interface – Logic level shifting
Reexamination Certificate
2009-03-16
2010-11-16
Barnie, Rexford N (Department: 2819)
Electronic digital logic circuitry
Interface
Logic level shifting
C327S333000
Reexamination Certificate
active
07834662
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.
REFERENCES:
patent: 4879690 (1989-11-01), Anami et al.
patent: 5450365 (1995-09-01), Adachi
patent: 6501306 (2002-12-01), Kim et al.
patent: 6920060 (2005-07-01), Chow et al.
patent: 7000214 (2006-02-01), Iadanza et al.
patent: 7019559 (2006-03-01), Kouzuma
patent: 7098692 (2006-08-01), Joshi et al.
patent: 7120061 (2006-10-01), Daga
patent: 7245532 (2007-07-01), Jyouno et al.
patent: 7355905 (2008-04-01), Campbell et al.
patent: 7474571 (2009-01-01), Campbell
patent: 7652504 (2010-01-01), Campbell
patent: 2001/0008491 (2001-07-01), Sumimoto
patent: 2003/0179032 (2003-09-01), Kaneko et al.
patent: 2004/0232944 (2004-11-01), Bu et al.
patent: 2005/0237099 (2005-10-01), Tachibana et al.
Office Action from U.S. Appl. No. 12/634,791, mailed on Apr. 20, 2010, 9 pages.
U.S. Appl. No. 12/419,605, filed Apr. 7, 2009.
P.A. Semi, Inc. “The PWRficient Processor Family,” Jan. 2006, pp. 1-31.
U.S. Appl. No. 12/634,791, filed Dec. 10, 2009.
Office Action from U.S. Appl. No. 11/173,565, mailed Sep. 10, 2007.
Campbell Brian J.
Hess Greg M.
Javarappa Naveen
Kaenel Vincent R. von
Apple Inc.
Barnie Rexford N
Merkel Lawrence J.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Tran Thienvu V
LandOfFree
Level shifter with embedded logic and low minimum voltage does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Level shifter with embedded logic and low minimum voltage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Level shifter with embedded logic and low minimum voltage will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4151202