Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Particular stable state circuit
Reexamination Certificate
2005-03-22
2005-03-22
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Particular stable state circuit
C327S203000
Reexamination Certificate
active
06870412
ABSTRACT:
The present invention relates to a flip-flop circuit employing an MTCMOS technology comprising a master latch unit and a slave latch unit, for latching input data and outputting the data under the control of an internal clock signal, wherein an output of the flip-flop circuit retains a state just before the admission to sleep mode when the state of the system is converted from sleep mode to active by means of making a data state of an input terminal of a master latch into the same state as an inversed data state of an input terminal of a slave latch circuit in sleep mode and storing it. The flip-flop circuit employing the MTCMOS technology in accordance with the present invention is capable of retaining a state just before the sleep mode when the state of the system is converted from sleep mode to active mode by using the sleep mode control signal by means of adding the feedback circuit to the conventional flip-flop circuit. In addition, while the flip-flop circuit employing the MTCMOS technology in accordance with the present invention has an operation speed slightly slower than that of the prior art flip-flop circuit employing the low-Vth transistor or the high-Vth transistor, a leakage current of the present invention is significantly smaller than that of the conventional art.
REFERENCES:
patent: 6246265 (2001-06-01), Ogawa
patent: 6492854 (2002-12-01), Ku et al.
patent: 6538471 (2003-03-01), Stan et al.
IEEE Journal of Solid State Circuit, vol. 32, No. 6, Satoshi Shigematsu, 1997, entitled A 1-V High-Speed MTCMOS Circuit Scheme for Power-Down Application Circuits.
Lam Tuan T.
Marger & Johnson & McCollom, P.C.
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