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. 08, 1994
Filed:
Dec. 31, 1992
Applicant:
Inventor:
Michael McGinn, Scottsdale, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
329337 ; 455214 ;
Abstract
A quadrature detector FM demodulates an intercarrier signal operating at an unknown frequency. An LC tank circuit develops a 90.degree. phase shift across inputs of a multiplier. The output signal of the multiplier is amplified and fedback to control a reactance stage and adjust the reactive load at an input of the multiplier so as to maintain a predetermined phase relationship independent of the frequency of the intercarrier signal. A phase compensation stage removes any real component at the inputs of the multiplier also in response to the feedback signal.