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:
Dec. 21, 1982
Filed:
Jun. 26, 1980
Wayne D Harrington, Round Rock, TX (US);
Stanley E Groves, Round Rock, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A data and clock recovery system for capturing and processing serial data of a type wherein data bits of an unknown format are interleaved with clock bits utilizes a phase lock loop capable of being operated in a capture mode or a tracking mode. The data stream is compared with an internally generated reference signal, and error pulses having widths proportional to the phase error are generated. In the capture mode, these error pulses are differentially processed to produce a control voltage which varies the frequency of a VCO which in turn alters the reference frequency. In the tracking mode, phase error pulses of fixed widths are processed only if the data bits occur in fixed windows. Differential amplifying means provide adjustable gain control of the error pulses. Means are provided for digitally controlling the loop's dynamic response when switching between the capture and tracking modes.