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. 05, 1995
Filed:
Jan. 21, 1994
James R Bortolini, Broomfield, CO (US);
Gary J Grimes, Thornton, CO (US);
AT&T Corp., Murray Hill, NJ (US);
Abstract
A phase-lock loop (FIG. 1) is initialized at power-up by an oscillator (14) control signal (28) that has previously been stored by a processor (20) in a non-volatile memory (27). The stored control signal is generated by the phase-lock loop's controller (12) in response to receipt of a calibrated reference input signal, as part of manufacturing of the phase-lock loop and occasionally thereafter during normal operation. Being stored in non-volatile memory, the control signal is not lost upon removal of power from the phase-lock loop. The stored control signal is then used to control the oscillator instead of the controller's output upon power-up and until the later one of (a) receipt by the phase-lock loop of a valid reference signal and (b) receipt of a directive for the controller to take over control of the oscillator.