H - Electricity – 03 – L
Patent
H - Electricity
03
L
H03L 7/095 (2006.01) H03L 7/087 (2006.01) H03L 7/113 (2006.01) H03L 7/14 (2006.01) H04L 7/033 (2006.01)
Patent
CA 2358018
The present invention provides a wide tracking range phase locked loop (PLL) circuit that achieves minimal fitter in a recovered clock signal, regardless of the source of the fitter (i.e. whether it is in the source or the transmission media). The present invention PLL has automatic harmonic lockout detection circuitry via a novel lock and seek control logic in electrical communication with a programmable frequency discriminator and a code balance detector. (The frequency discriminator enables preset of a frequency window of upper and lower frequency limits to derive a programmable range within which signal acquisition is effected. The discriminator works in combination with the code balance detector circuit to minimize the sensitivity of the PLL circuit to random data in the data stream). In addition, the combination of a differential loop integrator with the lock and seek control logic obviates a code preamble and guarantees signal acquisition without harmonic lockup. An adaptive cable equalizer is desirably used in combination with the present invention PLL to recover encoded transmissions containing a clock and/or data. The equalizer automatically adapts to equalize short haul cable lengths of coaxial and twisted pair cables or wires and provides superior fitter performance itself. The combination of the equalizer with the present invention PLL is -32- desirable in that such combination permits the use of short haul wires without significant jitter.
Brookhaven Science Associates
Piasetzki & Nenniger Llp
LandOfFree
Wide tracking range, auto ranging, low jitter phase lock... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wide tracking range, auto ranging, low jitter phase lock..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide tracking range, auto ranging, low jitter phase lock... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1656026