Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Reexamination Certificate
2011-07-12
2011-07-12
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
C326S062000, C326S081000
Reexamination Certificate
active
07977998
ABSTRACT:
An apparatus and method for testing level shifter threshold voltages on an integrated circuit includes one or more level shifter modules each including a number of level shifter circuits. Each level shifter circuit may be coupled to a first and a second voltage supply. Each level shifter circuit may also receive an input signal that is referenced to the first voltage supply, and to generate an output signal that is referenced to the second voltage supply. In addition, each level shifter module may include detection logic that may detect an output value of each of the level shifter circuits. The control circuit may be configured to iteratively change the voltage output from one of the voltage supplies, and maintaining a voltage on the other voltage supply while the input signal is provided to the level shifter circuits. The detection logic may capture the output value upon each change in voltage.
REFERENCES:
patent: 6487687 (2002-11-01), Blake et al.
patent: 6980035 (2005-12-01), Zhou et al.
patent: 7112996 (2006-09-01), Lee
patent: 7248243 (2007-07-01), Murakami et al.
Ananthanarayanan Priya
Jain Ashish R.
Klass Edgardo F.
Apple Inc.
Curran Stephen J.
Le Dinh T.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
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