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. 29, 1981
Filed:
Mar. 04, 1980
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
A frequency modulator including a free-running oscillator which is frequency modulated and which is frequency stabilized by means of a reference oscillation by way of a phase control loop having a phase detector and a loop filter. In order to be able to process d.c. components with such a frequency modulator, given a keyed modulation signal, and without abandoning the limitation of the modulation spectrum, the modulation signal is supplied to a control input of the oscillator both by way of a modulation filter and by way of the phase control loop. For this purpose, the phase control loop includes, between the oscillator output and the phase detector, a frequency divider having a division ratio controlled by the modulation signal.