Phase rotator control test scheme

Details Phase rotator control test scheme Phase rotator control test scheme

2005-06-16

2009-08-11

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Testing

Phase error or phase jitter

C375S224000, C324S500000, C324S537000, C324S763010, C702S117000, C702S057000, C702S069000

Reexamination Certificate

active

07573937

ABSTRACT:
Techniques and apparatus for testing phase rotators for detecting defective tap weights are provided. Phase rotator test logic may include a master phase rotator to cycle the phase of a clock signal distributed to operational phase rotators through an entire cycle of phases (e.g., an entire 360 degree rotation). Each operational phase rotator should respond with an equal but opposite phase shift in order to maintain phase lock. Thus, after sweeping, each tap weight is exercised, which may help ensure defective tap weights in any (e.g., quadrant) are detected during testing.

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