Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-01-23
2000-10-10
Kim, Jung Ho
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327534, G05F 302
Patent
active
061305723
ABSTRACT:
A negative charge pump circuit comprises a plurality of charge pump stages connected in series to each other. Each stage has a stage input terminal and a stage output terminal. A first stage has the stage input terminal connected to a reference voltage, a final stage has the stage output terminal operatively connected to an output terminal of the charge pump at which a negative voltage is developed; intermediate stages have the respective stage input terminal connected to the stage output terminal of a preceding stage and the respective stage output terminal connected to the stage input terminal of a following stage. Each stage comprises a first N-channel MOSFET with a first electrode connected to the stage input terminal and a second electrode connected to the stage output terminal, a second N-channel MOSFET with a first electrode connected to the stage output terminal and a second electrode connected to a gate electrode of the first N-channel MOSFET, a boost capacitor with one terminal connected to the gate electrode of the first N-channel MOSFET and a second terminal driven by a respective first digital signal switching between the reference voltage and a positive voltage supply, and a second capacitor with one terminal connected to the charge pump stage output terminal and a second terminal connected to a respective second digital signal switching between the reference voltage and the voltage supply. A gate electrode of the second N-channel MOSFET is connected, in the first stage, to a third digital signal switching between the reference voltage and the voltage supply, while in the remaining stage the gate electrode of the second N-channel MOSFET is connected to the stage input terminal.
REFERENCES:
patent: 4922402 (1990-05-01), Olivo et al.
patent: 5489870 (1996-02-01), Arakawa
patent: 5612921 (1997-03-01), Chang et al.
Branchetti Maurizio
Ghilardelli Andrea
Mulatti Jacopo
Carlson David V.
Galanthay Theodore E.
Kim Jung Ho
STMicroelectronics S.r.l.
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