Adjustable voltage regulator for providing a regulated...

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Reexamination Certificate

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C365S189090, C365S185230

Reexamination Certificate

active

07957214

ABSTRACT:
Voltage regulators, memories, and methods for providing a regulated output voltage are disclosed. For example, one such voltage regulator includes a comparator circuit, a driver circuit, an impedance circuit, and a modulation circuit. The comparator circuit generates an output voltage according to a difference between a reference voltage and a feedback voltage. The driver circuit is coupled to an output of the comparator circuit and drives the regulated output voltage at an output node according to the output voltage from the comparator circuit. The impedance circuit is coupled to the comparator circuit and provides the feedback voltage to the comparator circuit in response to a detection current from the output node. The modulation circuit is coupled to the impedance circuit and adjusts a modulation current component of the detection current to adjust the regulated output voltage.

REFERENCES:
patent: 7139203 (2006-11-01), Huber
patent: 7277355 (2007-10-01), Tanzawa
patent: 7577043 (2009-08-01), Chou et al.
patent: 2010/0128551 (2010-05-01), Tanzawa et al.
Ryu Ogiwara et al.; “A 0.5 μm, 3-V, 1T1C, 1-Mbit FRAM with a Variable Reference Bit-Line Voltage Scheme using a Fatigue-Free Reference Capacitor”; IEEE Journal of Solid-State Circuits; vol. 35; No. 4; Apr. 2000; pp. 545-551.
Toru Tanzawa et al.; “Wordline Voltage Generating System for Low-Power Low-Voltage Flash Memories”; IEEE Journal of Solid-State Circuits; vol. 36; No. 1; Jan. 2001; pp. 55-63.
Toru Tanzawa et al.; “A 44-mm2Four-Bank Eight-Word Page-Read 64-Mb Flash Memory with Flexible Block Redundancy and Fast Accurate Word-Line Voltage Controller”; IEEE Journal of Solid-State Circuits; vol. 37; No. 11; Nov. 2002; pp. 1485-1492.
Robert J. Milliken et al.; “Full On-Chip CMOS Low-Dropout Voltage Regulator”; IEEE Journal of Solid-State Circuits and Systems-I; Regular Papers; vol. 54, No. 9; Sep. 2007; pp. 1879-1890.

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