Programmable phase interpolator adjustment for ideal data...

Details Programmable phase interpolator adjustment for ideal data... Programmable phase interpolator adjustment for ideal data...

2008-07-22

2008-07-22

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S354000

Reexamination Certificate

active

10748236

ABSTRACT:
A clock recovery circuit includes a demodulator which generates in-phase and quadrature signals from a data signal and a phase adjuster which adjusts a phase of the quadrature signal independently from a phase of the in-phase clock signal. The phase adjustment causes a non-orthogonal relationship to exist between the phases of the quadrature and in-phase signals. The independent phase adjustment may be dynamically performed or may be performed in fixed increments to achieve a predetermined level of performance. In one application, the adjusted quadrature phase signal serves as a clock signal for controlling sampling of the data signal.

REFERENCES:
patent: 4821296 (1989-04-01), Cordell
patent: 5602879 (1997-02-01), Wada
patent: 5612975 (1997-03-01), Becker et al.
patent: 5878088 (1999-03-01), Knutson et al.
patent: 6801066 (2004-10-01), Lee
patent: 2002/0163981 (2002-11-01), Troemel, Jr.
patent: 2004/0037366 (2004-02-01), Crawford

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