Computer-aided design and analysis of circuits and semiconductor – Nanotechnology related integrated circuit design
Reexamination Certificate
2006-08-08
2006-08-08
Lin, Sun James (Department: 2825)
Computer-aided design and analysis of circuits and semiconductor
Nanotechnology related integrated circuit design
C716S030000
Reexamination Certificate
active
07089515
ABSTRACT:
A method for compensating the threshold voltage roll-off using transistors containing back-gates or body nodes is provided. The method includes designing a semiconductor system or chip having a plurality of transistors with a channel length of Lnom. For the present invention, it is assumed that the channel length of these transistors at the completion of chip manufacturing is Lmax. This enables one to set the off-current to the maximum value of I-offmaxwhich is done by setting the threshold voltage value to Vtmin. The Vtminfor these transistors is obtained during processing by using the proper implant dose. After manufacturing, the transistors are then tested to determine the off-current thereof. Some transistors within the system or chip will have an off-current value that meets a current specification. For those transistor devices, no further compensation is required. For other transistors within the system or chip, the off-current is not within the predetermined specification. For those transistors, threshold voltage roll-off has occurred since they are transistors that have a channel length that is less than nominal. For such short channel transistors, the threshold voltage is low, even lower than Vtmin, and the off-current is high, even higher than I-offmax. Compensation of the short channel transistors is achieved in the present invention by biasing the back-gate or body node to give increased threshold voltage about equal to Vtminand hence an off-current that meets the predetermined specification, which is about equal to I-offmax.
REFERENCES:
patent: 4260909 (1981-04-01), Dumbri et al.
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patent: 5622880 (1997-04-01), Burr et al.
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patent: 6472919 (2002-10-01), Burr
Dennard Robert H.
Haensch Wilfried E.
Hanafi Hussein I.
Cheung, Esq. Wan Yee
International Business Machines - Corporation
Lin Sun James
Scully , Scott, Murphy & Presser, P.C.
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