High output impedance charge pump for PLL/DLL

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing

Reexamination Certificate

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Details

C327S147000

Reexamination Certificate

active

11009534

ABSTRACT:
A charge pump for use in a Phase Locked Loop/Delay Locked Loop minimizes static phase error through the use of an operational amplifier. The operational amplifier also mitigates the effects of low power supply voltage.

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Kim, C.H., et al., “A 64-Mbit, 640-Mbytes/s Bidirectional Data Strobed, Double-Data-Rate SDRAM with a 40-mW DLL for a 256-Mbyte Memory System,”IEEE Journal of Solid-State Circuits, vol. 33(11): (Nov. 1998).
Moon, Y., et al., “An All-Analog Multiphase Delay-Locked Loop Using a Replica Delay Line for Wide-Range Operation and Low-Jitter Performance,”IEEE Journal of Solid-State Circuits, vol. 35(3): (Mar. 2000).
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