Burst mode clock and data recovery frequency calibration

Details Burst mode clock and data recovery frequency calibration Burst mode clock and data recovery frequency calibration

2006-06-27

2006-06-27

Callahan, Timothy P. (Department: 2816)

Oscillators

With frequency calibration or testing

C331S049000

Reexamination Certificate

active

07068113

ABSTRACT:
A direct calibration technique significantly tightens a tolerance band between multiple voltage controlled oscillators (VCOs), to correct for slight frequency mismatch between the multiple VCOs. The tightened tolerance band enhances the bit error rate (BER) and/or lengthens the possible consecutive identical digits (CIDs) length, and is particularly useful in integrated circuit applications. A Frequency Locked Loop (FLL), an accumulator, and a DAC are implemented to form a calibration loop that becomes far more digital in nature than a PLL, permitting greater embedded circuit test coverage and ease of integration in VLSI digital technologies. A frequency calibrated loop with digital accumulator and DAC in lieu of a PLL with associated charge pump integrator eliminates the need for large integrated capacitors, sensitivity to drift due to the leakage currents associated with deep sub-micron technologies, and embedded analog voltages which generally cannot be tested.

REFERENCES:
patent: 6040743 (2000-03-01), Bjorklid et al.
patent: 6707342 (2004-03-01), Zachan et al.
patent: 6788155 (2004-09-01), Chaudhuri et al.
patent: 6803827 (2004-10-01), Kenney et al.
patent: 6833767 (2004-12-01), Huff et al.

Affiliated with

Also associated with

Rating

Burst mode clock and data recovery frequency calibration does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Burst mode clock and data recovery frequency calibration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Burst mode clock and data recovery frequency calibration will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3689756