Methods and apparatus for a gray-coded phase rotating frequency divider

A method for phase selection, the method comprising:

• grouping a plurality of clock phases into two or more groups;
• for each group, selecting a respective clock phase based on one or more selection bits that are part of a selection input signal, and wherein the operation of selecting uses the selection input signal to simultaneously select from the groups;
• and
• generating a gray coded output that forms the selection input signal so that when the gray coded output changes state only selection bits associated with a single group change.

A computer program product for phase selection, comprising:

• a computer-readable medium embodying codes executable by a processor to cause the processor to:
• group a plurality of clock phases into two or more groups;
• for each group, select a respective clock phase based on one or more selection bits that are part of a selection input signal, and wherein the selection input signal is used to simultaneously select from the groups;
• and
• generate a gray coded output that forms the selection input signal so that when the gray coded output changes state only selection bits associated with a single group change.

A phase selector apparatus, comprising:

• means for grouping a plurality of clock phases into two or more groups;
• means for selecting a respective clock phase for each group based on one or more selection bits, respectively, that are part of a selection input signal, and wherein the means for selecting uses the selection input signal to simultaneously select from the groups;
• and
• means for generating a gray coded output that forms the selection input signal so that when the gray coded output changes state only selection bits associated with a single group change.