Electronic digital logic circuitry – Clocking or synchronizing of logic stages or gates – Field-effect transistor
Reexamination Certificate
2011-07-26
2011-07-26
Crawford, Jason M (Department: 2819)
Electronic digital logic circuitry
Clocking or synchronizing of logic stages or gates
Field-effect transistor
C326S098000
Reexamination Certificate
active
07986166
ABSTRACT:
A clock buffer for a clock network that reduces leakage current and lowers power consumption. The clock buffer includes a first CMOS transistor, a second CMOS transistor, and a leakage current prevention circuit connected to the first and second CMOS transistors. The leakage current prevention circuit includes a first PMOS transistor, which is connected between the source of a PMOS transistor of the first CMOS transistor and a power supply line, and a second PMOS transistor, which is connected between the source of a PMOS transistor of the second CMOS transistor and the power supply line. The first and second PMOS transistors are deactivated in response to an enable signal generated when a circuit block does not require the clock signal. The first and the second PMOS transistors have predefined widths and lengths such that the addition of these transistors in series with the CMOS transistors does not increase the propagation delay of the clock buffer circuit. Deactivating the first and second PMOS transistors disconnects the CMOS transistors from the power supply line, which prevents current leakage.
REFERENCES:
patent: 5051625 (1991-09-01), Ikeda et al.
patent: 5583457 (1996-12-01), Horiguchi et al.
patent: 5614847 (1997-03-01), Kawahara et al.
patent: 5952951 (1999-09-01), Fujino
patent: 6100726 (2000-08-01), Nayebi
patent: 6140836 (2000-10-01), Fujii et al.
patent: 6307236 (2001-10-01), Matsuzaki et al.
patent: 6359489 (2002-03-01), Huang
patent: 6861878 (2005-03-01), Haruhana et al.
patent: 7227383 (2007-06-01), Hoberman
patent: 7237163 (2007-06-01), Dhong
patent: 7327993 (2008-02-01), Khlat
patent: 7560976 (2009-07-01), Choi et al.
patent: 2002/0008999 (2002-01-01), Hidaka
patent: 2006/0145726 (2006-07-01), Hidaka
patent: 2006/0220722 (2006-10-01), Komura et al.
patent: 2008/0238510 (2008-10-01), Aksamit
patent: 2009/0199038 (2009-08-01), Sigal
patent: 2009/0237164 (2009-09-01), Kase
Kawaguchi, Hiroshi et al., A CMOS Scheme for 0.5V Supply Voltage with Pico-Ampere Standby Current, ISSCC98/Session 12/TD: Low Voltage and Multi-Level Techniques/Paper FP 12.4, Feb. 6, 1998.
Bhunia, Swarup et al., A Novel Synthesis Approach for Active Leakage Power Reduction Using Dynamic Supply Gating, DAC 2005, Jun. 13-17, 2005.
Verma Chetan
Verma Nitin
Bergere Charles
Crawford Jason M
Freescale Semiconductor Inc.
LandOfFree
Clock buffer circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Clock buffer circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clock buffer circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2690628