Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-05-17
2005-05-17
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S543000, C323S316000
Reexamination Certificate
active
06894556
ABSTRACT:
A current mirror circuit that provides an excellent current that does not deteriorate, even when the power source is lower supply voltage. A mirror current flows in a first MOS transistor when a constant current flows in the MOS transistor from a current source. A subtracter outputs the difference between voltage Vg1of the gate of the MOS transistor and voltage Vd1of the drain, and applies this difference to the gate of a second MOS transistor. When the power-supply voltage of this circuit becomes lower supply voltage and the absolute value of Vd1decreases, the MOS transistors enter the triode region, and the mirror current decreases. when the absolute value of Vd1decreases, because the difference between Vg1and Vd1becomes larger, the drain current of the second MOS transistor increases, and the amount by which the mirror current decreases is counterbalanced.
REFERENCES:
patent: 4297646 (1981-10-01), LoCascio et al.
patent: 4423387 (1983-12-01), Sempel
patent: 4567426 (1986-01-01), van de Plassche et al.
patent: 4689607 (1987-08-01), Robinson
patent: 5109187 (1992-04-01), Guliani
patent: 5349286 (1994-09-01), Marshall et al.
patent: 5512815 (1996-04-01), Schrader
patent: 5517143 (1996-05-01), Gros
patent: 5612614 (1997-03-01), Barrett et al.
patent: 5982227 (1999-11-01), Kim et al.
patent: 6181191 (2001-01-01), Paschal
Cunningham Terry D.
Kabushiki Kaisha Toshiba
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