Invention Grant
- Patent Title: Leakage compensated reference voltage generation system
- Patent Title (中): 泄漏补偿参考电压发生系统
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Application No.: US12639454Application Date: 2009-12-16
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Publication No.: US08027207B2Publication Date: 2011-09-27
- Inventor: John A. Fifield , Harold Pilo
- Applicant: John A. Fifield , Harold Pilo
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Scully, Scott, Murphy & Presser, P.C.
- Agent David A. Cain, Esq.
- Main IPC: G11C5/14
- IPC: G11C5/14

Abstract:
An e-fuse sense circuit employs a single ended sense scheme in which the reference voltage is compensated for leakage. A reference voltage generator includes a pull-up resistor of similar value to the selected bitline pull-up resistor. As the sensing trip point is adjusted by selection of a bitline pull-up resistor, a pair of pull-up and pull-down resistors are adjusted together to adjust the impedance of the reference voltage generator. A leakage-path simulation structure including a parallel connection of bitcells is added to the reference voltage generator. The leakage-path simulation structure imitates the bitcells on a bitline in the array of e-fuses. Leakage current on the bitline offsets the bitline voltage by a certain error voltage. The reference voltage is also offset by a fraction of the error voltage to balance the shifts in the ‘1’ and ‘0’ margin levels in the presence of leakage.
Public/Granted literature
- US20110141824A1 LEAKAGE COMPENSATED REFERENCE VOLTAGE GENERATION SYSTEM Public/Granted day:2011-06-16
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