Digital phase aligner

Pulse or digital communications – Spread spectrum – Direct sequence

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

375 86, 375 95, H04L 700

Patent

active

047560118

ABSTRACT:
This circuit phase aligns a phase-varying input data stream with a local clock. The incoming data stream is sampled at four quadrature points and these samples are applied to Ex-Or gates to yield four disagreement signals which indicates whether or not a transition from binary 0 to 1, or vise versa, has occurred between any pair of samples. The in-phase (0.degree.) and anti-phase (180.degree.) samples are serially loaded into different but similar shift registers, the taps of which provide the output with earlier or later versions of the input data stream at either 0.degree. or 180.degree.. A control circuit analyzes the disagreement signals and provides control signals which determine which of the shift register taps is connected to the aligner output. The circuit can correct for phase slippage between input data and local clock of up to plus or minus several time slots.

REFERENCES:
patent: 3404232 (1968-10-01), Burford
patent: 3851101 (1974-11-01), En et al.
patent: 3982184 (1976-09-01), Sanderson
patent: 4010323 (1977-03-01), Peck
patent: 4012598 (1977-03-01), Wiley
patent: 4128812 (1978-12-01), Pavlis
patent: 4191998 (1980-03-01), Carmody
patent: 4278898 (1981-07-01), Rhode
patent: 4376309 (1983-03-01), Fenderson et al.
patent: 4543531 (1985-09-01), Sugita et al.
patent: 4569065 (1986-02-01), Cukier
patent: 4604582 (1986-08-01), Strenkowski et al.
patent: 4611335 (1986-09-01), Arai et al.
patent: 4637037 (1987-01-01), Chao
patent: 4651108 (1987-03-01), Okita et al.
patent: 4672639 (1987-06-01), Tanabe et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Digital phase aligner does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital phase aligner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital phase aligner will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2337423

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.