Phase shifting in DLL/PLL
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United States of America Patent
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Jun 23, 2009
Grant Date -
Oct 2, 2008
app pub date -
Mar 27, 2007
filing date -
Mar 27, 2007
priority date (Note) -
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status (Latency Note)
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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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