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:
Nov. 17, 1987
Filed:
Mar. 26, 1986
Helmut Fischer, Munich, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
A digital phase control circuit incorporates a phase detector and a controllable oscillator controlled by an internal clock. The oscillator is formed as a presettable counter which is counted by the internal clock and preset with a variable intial value corresponding to a function of the frequency of the current data clock derived from an incoming data stream. The phase detector is formed as a shift register for delaying data signals, a counter storage register associated with a counter, and an intermediate storage register associated with the shift register, the storage registers manifesting the state of the counter or the state of the shift register at a predetermined time during an operating cycle, as indicated by the counter. Depending on the position of a data signal in the shift register when the counter reaches a predetermined state, one of the storage registers is selected for connection to a rated value generator for selection of a new rated value for presetting the counter, such new rated value being selected in accordance with the frequency of the current data clock and with the phase-signifying content of one of the storage registers.