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:
Feb. 10, 1987
Filed:
Oct. 22, 1985
Applicant:
Inventor:
Ludwig Hofmann, Lohhof, DE;
Assignee:
Siemens Aktiengesellschaft, Munich and Berlin, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03D / ; H03D / ;
U.S. Cl.
CPC ...
329 50 ; 307525 ; 328133 ; 329122 ; 329126 ; 375 81 ; 375120 ; 455214 ;
Abstract
A digital quartz stabilized FM discriminator which is linear and temperature independent and frequency stable and includes a circuit having a phase comparator which receives an input signal and an input from a reversible divider (3) which produces the angular frequencies f.sub.u and f.sub.o of the discriminator. The reversible divider divides a quartz stabilized reference frequency signal under control of the output signal from the phase comparator. A discriminator output signal is obtained by passing the output signal of the phase comparator through a low pass filter.