Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-12-22
2010-12-28
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C363S059000, C363S060000
Reexamination Certificate
active
07859321
ABSTRACT:
Apparatus (40) comprising a multistage charge pump (10) having an output (41) for connecting a load (Cout, KL). The charge pump (10) comprises m gain stages for charging and discharging m external stage capacitors (C) in order to provide an output voltage (Vout) at the output (41) that is about m times higher than a supply voltage (Vdd) of the charge pump (10). The charging and discharging is influenced by switches inside said charge pump (10) that are controlled by a switching signal having a switching frequency (fosc). A monitoring circuit (20) is provided that monitors temperature-induced changes of the value of an external reference capacitor (Cref). Furthermore, means (30) for adjusting the switching frequency (fosc) are employed in order to compensate variations of the gain of said charge pump (10) that are caused by the changes of the value of the m external stage capacitors (C).
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patent: 6356062 (2002-03-01), Elmhurst et al.
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Wang, C-C; et al “Efficiency Improvement in Charge Pump Circuits” IEEE Journal of Solid State Circuits, vol. 32, No. 6, Jun. 1997, pp. 852-860.
Donovan Lincoln
Goyal Shikha
NXP B.V.
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