Electronic digital logic circuitry – Function of and – or – nand – nor – or not – Field-effect transistor
Reexamination Certificate
2006-11-13
2008-08-26
Barnie, Rexford (Department: 2819)
Electronic digital logic circuitry
Function of and, or, nand, nor, or not
Field-effect transistor
C326S119000
Reexamination Certificate
active
07417469
ABSTRACT:
A method and system for automatically detecting and optimally compensating a wide range of die leakage currents in dynamic circuits is presented. A self-adaptive keeper tracks the leakage and reduces the leakage effects by optimally controlled compensation current. The self-adaptive keeper utilizes a 2-stage embedded current mirror circuit, a dummy cell and a keeper transistor to compensate leakage current. The load impact of the self-adaptive keeper on the dynamic circuit components (for example, the impact on memory cells) is minimized by a dummy cell which detects and matches the instant leakage current. Amplification in the 2-stage embedded current mirror circuit provides an optimal current strength in the keeper transistor. The optimally amplified leakage current is utilized to compensate for a leakage induced voltage drop at the circuit's output. Thus, the self-adaptive keeper ensures the robustness of the circuit in real time and does not create any negative trade-off on read latency.
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Author:Tamer Cakici and Kaushik Roy□□Title: Current Mirror Evaluation Logic: A New Circuit Style for High Fan-in Dynamic Gates□□Date: 2002□□Publisher: School of Electrical and Computer Engineering, Purdue University□□Pertinent pp. 395-398.
Cheng Zhibin
Kaplun Aleksandr
Barnie Rexford
Cockburn Josh G.
Dillon & Yudell LLP
International Business Machines - Corporation
Tran Thienvu V
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