Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-08-09
2005-08-09
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
C327S541000, C327S543000, C323S315000
Reexamination Certificate
active
06927621
ABSTRACT:
When the substrate bias voltage Vbb lowers by the pumping operation of the charge pump circuit, a drain-to-source resistance of the N-transistor becomes high. When a first power supply voltage Vcc is set at high value, a drain-to-source current of the N-transistor increases (I+ΔI1), however the drain-to-source current decreases (I+ΔI1−ΔI2) by the increase of the drain-to-source current owing to the substrate bias effect so that the increase of the potential of the node N34caused by the increase of the first power supply voltage VCC is restrained. As a result, a reference level of the substrate bias voltage Vbb does not largely lower than the reference level of the substrate bias voltage Vbb when the first power supply voltage VCC is in a standard level.
REFERENCES:
patent: 4825142 (1989-04-01), Wang
patent: 5394026 (1995-02-01), Yu et al.
patent: 5670907 (1997-09-01), Gorecki et al.
patent: 5744998 (1998-04-01), Ito et al.
patent: 5834967 (1998-11-01), Kuroda et al.
patent: 5952871 (1999-09-01), Jeon
Cunningham Terry D.
Englund Terry L.
Oki Electric Industry Co. Ltd.
Volentine Francos & Whitt PLLC
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