Digital visual interface

Details Digital visual interface Digital visual interface

2007-06-12

2007-06-12

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C375S355000

Reexamination Certificate

active

10794418

ABSTRACT:
Techniques or designs of circuits to correct distortions in signals transported over a high-speed digital connection between a video source (e.g., a PC or a DVD player) and a digital monitors (such as LCDs) are disclosed. According to one aspect of the present invention, a distorted signal is corrected by an interface circuit that oversamples the incoming signal with clock pulses or signals generated using a phase lock loop (PLL) from a clock seed signal. These clock signals possess different phases that are shifted from each other. In order to support a wide range of data rate, a programmable DPLL is used to produce a number of different ranges of clock frequency (e.g., 4 ranges). In addition, to avoid data phase shift, a delay locked loop (DLL) is used to compensate for the phase shift. A phase detection logic is also used to extract phase information from the over-sampled data. The phase information is fed back to the DLL.

REFERENCES:
patent: 4700382 (1987-10-01), Means et al.
patent: 6119242 (2000-09-01), Harrison
patent: 6178339 (2001-01-01), Sakai et al.
patent: 2003/0137324 (2003-07-01), Park et al.
patent: 2004/0076228 (2004-04-01), Park et al.
patent: 2004/0091073 (2004-05-01), Smith et al.

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