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:
May. 17, 1994
Filed:
Apr. 26, 1993
Applicant:
Inventor:
Ross W Lampe, Raleigh, NC (US);
Assignee:
Ericsson GE Mobile Communications Inc., Lynchburg, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03C / ; H03L / ;
U.S. Cl.
CPC ...
332103 ; 331 12 ; 331 23 ; 375 67 ; 375 60 ; 375120 ;
Abstract
A phase-locked loop incorporates a quadrature modulator for generating constant envelope phase or frequency modulation. Locating the quadrature modulator within the feedback loop or feeding the output signal of the quadrature modulator into the feedback loop permits accurate constant envelope phase modulation of the loop reference oscillator and completely suppresses undesired AM and PM components of the modulated signal.