Phase shifting in DLL/PLL

Details Phase shifting in DLL/PLL Phase shifting in DLL/PLL

2007-03-27

2009-06-23

Zweizig, Jeffrey S (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

07551012

ABSTRACT:
The disclosure relates to phase shifting in Delay Locked Loops (DLLs) and Phase-Locked Loops (PLLs). A charge pump in the DLL or PLL includes a capacitor connected in parallel to an output node. A primary current switching circuit charges the capacitor with a source current and discharges the capacitor with a sink current. A supplemental source circuit sources a positive phase shift producing current which has a range of magnitudes. A magnitude of the positive phase shift producing current is determined by at least one source selection signal. A supplemental sink circuit for sources a negative phase shift producing current which has a range of magnitudes. A magnitude of the negative phase shift producing current is determined by at least one sink selection signal.

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