Charge pump power supply

G - Physics – 11 – C

Patent

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Details

G11C 11/4074 (2006.01) G11C 5/14 (2006.01)

Patent

CA 2428747

Disclosed is a charge pump based power supply for use with low voltage dynamic random access memory (DRAM) including a charge pump and a non-overlapping clock signal generator. The charge pump comprises two pump cascades coupled in parallel. Each pump cascade includes a plurality of pump stages connected serially between a supply voltage and an output node. Adjacent stages of each cascade are clocked on opposite phases of the system clock signal. The charge pump drives an output node on the rising and falling edge of the system clock signal. A non-overlapping clock signal generator comprises a charge sharing transistor, controlled by an equalization pulse generated by the outputs of a latch, which equalizes the non-overlapping output clock signals through charge sharing during the non-overlap period between phases of the system clock. The non-overlapping clock signal generator further comprises a transmission gate included to ensure equalization of the non-overlap period.

L'invention concerne une alimentation à pompe de charge à utiliser avec une mémoire vive dynamique basse tension, comportant une pompe de charge et un générateur de signaux d'horloge non chevauchants. La pompe de charge comprend deux cascades de pompes couplées en parallèle. Chaque cascade de pompe comporte plusieurs étages de pompes connectés en série entre une alimentation et un noeud de sortie. Les étages adjacents de chaque cascade sont synchronisés sur les phases opposées du signal d'horloge système. La pompe de charge excite un noeud de sortie lors de la montée et de la descente du signal d'horloge système. Un générateur de signaux d'horloge non chevauchants possède un transistor partageant la charge, commandé par une impulsion d'égalisation générée par les sorties d'un verrou, qui égalise les signaux de sortie non chevauchants par le partage de charge pendant la période de non chevauchement entre les phases du système d'horloge. Le générateur de signaux d'horloge comporte également une porte de transmission conçue pour assurer l'égalisation de la période de non chevauchement.

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