Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With bootstrap circuit
Patent
1998-06-11
2000-05-09
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With bootstrap circuit
327588, 327390, 327391, H03K 7162
Patent
active
060609486
ABSTRACT:
A circuit for charging a capacitance using an LDMOS integrated transistor functioning as a source follower stage and controlled, in a manner to emulate a high voltage charging diode of the capacitance via a bootstrap capacitor charged by a diode connected to the supply node of the circuit, and by an inverter driven by a logic control circuit as a function of a first Low Gate Drive Signal and of a second logic signal. The second logic signal is active during a phase where the supply voltage is lower than the minimum switch-on voltage of the integrated circuit. The circuit further includes a second inverter functionally referred to the charging node of the bootstrap capacitor and to the voltage of the output node of the inverter. The second inverter has an input coupled to the second logic signal and an output coupled to the gate node of the LDMOS transistor for preventing accidental undue switch-on of the LDMOS transistor.
REFERENCES:
patent: 5138200 (1992-08-01), Barsanti et al.
patent: 5212415 (1993-05-01), Murakami et al.
patent: 5365118 (1994-11-01), Wilcox
patent: 5572156 (1996-11-01), Diazzi et al.
patent: 5742196 (1998-04-01), Fronen et al.
patent: 5883547 (1999-03-01), Diazzi et al.
Cantone Giuseppe
Gariboldi Roberto
Genova Angelo
Tarantola Mario
Callahan Timothy P.
Galanthay Theodore E.
Luu An T.
STMicroelectronics S.r.l.
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