Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-11-28
2006-11-28
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
07142039
ABSTRACT:
A charge pump includes a resistor divider connected between an output voltage node and ground and a comparator inputting a reference voltage at one input, and a divided voltage from the resistor divider at another input. A digital control circuit is enabled by the comparator. A first transistor and a second transistor are in series between an input voltage node and the ground, both transistors controlled by the digital control circuit. A pump capacitor is connected between to the output voltage node and between the first and second transistor, and being charged by turning the first and second transistors on and off. A first diode is between the pump capacitor and the input voltage node. A second diode between the pump capacitor and the output voltage node. A reservoir capacitor between the output voltage node and ground. The digital control circuit comprises a first shift register. The first transistor comprises a first plurality of parallel transistors, the first shift register includes any of a first plurality of DQ, RS or JK flip flops connected in series, and outputs of the flip flops control gates of the first plurality of parallel transistors.
REFERENCES:
patent: 5362988 (1994-11-01), Hellums
patent: 5604671 (1997-02-01), Okamura
patent: 6486728 (2002-11-01), Kleveland
patent: 6693483 (2004-02-01), Deml et al.
Bayer, E; Schmeller, H, Charge Pump With Active Cycle Regulation - Closing the Gap Between Linear and Skip Modes, In Power Electronic Specialists Conference, 2000. PESC 00. 2000 IEEE 31st Annual, vol. 3, Jun. 18-23, 2000, pp. 1497-1502, vol. 3.
Chen Chun-Ying
Cheung Yee Ling
Broadcom Corporation
Sterne Kessler Goldstein & Fox P.L.L.C.
Tra Quan
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