The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 1988
Filed:
Dec. 24, 1986
Robert R Cordell, Tinton Falls, NJ (US);
Bell Communications Research, Inc., Livingston, NJ (US);
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.