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:
Mar. 15, 1994
Filed:
Oct. 02, 1992
Applicant:
Inventor:
Ghassan R Gebara, Spring, TX (US);
Assignee:
Compaq Computer Corporation, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 / ; 331 25 ; 331 27 ; 331 74 ; 331D / ; 364D / ; 364270 ; 395550 ;
Abstract
A method of starting up a system clock that has been generated by a phase-locked loop, and circuitry for accomplishing that method. A low frequency master clock signal is distributed to circuits that generate high frequency local clock signals. These circuits generate the high frequency local clock signals using phase-locked loops in a frequency multiplier configuration. Lock indicator circuitry determines when the phase-locked loop has locked onto the master clock signal and then enables output buffers that then provide the high frequency clock signals to components in the system which need those local clocks.