Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Reexamination Certificate
2011-03-29
2011-03-29
Nguyen, Long (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
C327S333000, C327S112000
Reexamination Certificate
active
07915937
ABSTRACT:
Disclosed herein are circuitry and methods for improving differential signals that cross power domains. In an example embodiment, the power supply domain boundary along the output paths that generate the differential signal is staggered, such that the boundary occurs at an odd numbered stage in one differential output path and at an even numbered stage in the other differential output. Defining the power supply domain boundary in this manner can help ensure that the same logical state is present at the boundary in either of the differential output paths. This same logic signal should affect subsequent stages similarly from a speed perspective, and so should similarly affect the differential signals generated by each of the output paths. This means, among other things, that the differential signal as generated should tend to cross nearer to a midpoint voltage, which increases its compliance with certain integrated circuit specifications such as the Vox specification used for the differential data strobe in an SDRAM.
REFERENCES:
patent: 7486112 (2009-02-01), Tanaka
patent: 2009/0108925 (2009-04-01), Tang et al.
Micron Technical Note DDR3 ZQ Calibration (2008) (http://download.micron.com/ pdf/technotes/DDR3/TN4102.pdf).
Micro)n Technology, Inc.
Nguyen Long
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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