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:
Aug. 15, 2000
Filed:
Oct. 07, 1999
Applicant:
Inventor:
Ludwig Hofmann, Ilmmunster, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Primary Examiner:
Int. Cl.
CPC ...
H03L / ; H03L / ; H03L / ;
U.S. Cl.
CPC ...
331 16 ; 327105 ; 327106 ; 331 18 ; 331 25 ; 331 34 ; 331176 ;
Abstract
A circuit for automatic frequency control includes an oscillator and a digital synthesis device to which a first frequency of the oscillator is supplied as a clock frequency and which generates an output signal having a second frequency. A frequency comparison device determines a frequency difference between the second frequency and a reference frequency and generates a digital output signal reproducing the frequency difference. The digital output signal is then supplied as an addition value to the digital synthesis device. The circuit for automatic frequency control generates a highly accurate and temperature-compensated output signal with the second frequency.