Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Reexamination Certificate
2007-02-27
2009-06-23
Tang, Minh N (Department: 2829)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
C324S765010
Reexamination Certificate
active
07550987
ABSTRACT:
A method and circuits for measuring operating and leakage current of individual blocks within an array of test circuit blocks provides measurement free of error due to leakage currents through non-selected circuit blocks, without requiring an independent test facility for each circuit block. The circuit includes a pair of power supply grids and selection circuits at each test circuit block to select between a test power grid and a “rest” power grid used to supply current to the non-selected circuits. The leakage currents through the non-selected circuits are thus sourced from the rest grid and error that would otherwise be introduced in the test grid current measurement is avoided. The test circuit blocks may be ring oscillators, and the measured current may be the operating and/or leakage current of the ring oscillator. The circuit blocks may also include individual devices for IV (current-voltage) characterization using an additional gate input grid.
REFERENCES:
patent: 6838869 (2005-01-01), Rogers et al.
patent: 7088131 (2006-08-01), Stout et al.
patent: 7423446 (2008-09-01), Agarwal et al.
U.S. Appl. No. 11/422,913, filed Jun. 8, 2006, Agarwal, et al.
U.S. Appl. No. 11/462,186, filed Aug. 3, 2006, Agarwal, et al.
Acharyya Dhruva J.
Nassif Sani R.
Rao Rahul M.
Handelsman Libby Z.
Harris Andrew M.
International Business Machines - Corporation
Mitch Harris Atty at Law, LLC
Tang Minh N
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