Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-06-11
2000-02-29
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327534, G05F 110
Patent
active
060314125
ABSTRACT:
A circuit for charging a capacitance using an LDMOS integrated transistor controlled in a manner to emulate a high voltage charging diode of the capacitance. The circuit avoids the switch-on of parasitic bipolar transistors of the LDMOS structure during transient states. The circuit includes a number of junctions directly biased between a source node and a body node of the LDMOS transistor, a current generator referred to a ground of the circuit, at least one switch between the source and a first junction of a chain of directly biased junctions, and a limiting resistor connected between the body and the current generator referred to ground. The switch is open during a charging phase of the capacitance and is closed when the charging voltage of the capacitance exceeds a preestablished threshold responsive to a control signal. The switch is controlled by a logic signal active during the phase in which the supply voltage of the integrated circuit is lower than the minimum switch-on voltage of the same integrated circuit, for charging the body with a current whose maximum value is limited to a preestablished value.
REFERENCES:
patent: 5081371 (1992-01-01), Wong
patent: 5321313 (1994-06-01), Oberhauser
patent: 5463347 (1995-10-01), Jones et al.
patent: 5502632 (1996-03-01), Warmerdam et al.
patent: 5506539 (1996-04-01), Kelly et al.
patent: 5631588 (1997-05-01), Bertolini
patent: 5650737 (1997-07-01), Eilley
Cantone Giuseppe
Gariboldi Roberto
Genova Angelo
Tarantola Mario
Galanthay Theodore E.
STMicroelectronics S.r.l.
Tra Anh-Quan
Tran Toan
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