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. 07, 1996
Filed:
Apr. 18, 1995
Peter McConnell, Burnaby, CA;
Sierra Wireless, Richmond, CA;
Abstract
A dual port frequency modulator and method for eliminating the undesired affects caused by high port/low port phase differences in a standard dual port frequency modulator. The frequency modulator includes an inverse filter stage coupled to the input of a modulator stage including a first high port processing path for processing high frequency components of a modulation signal and a second low port processing path for processing low frequency components of a modulation signal. The outputs of the high and low paths are coupled to separate ports of a voltage controlled oscillator. The impulse response of the inverse filter is designed to be the inverse of the impulse response of the modulator stage. The filter functions to counter-act the adverse effects caused by the delay difference in the high and low processing paths of the modulator stage such that the overall response of the dual port frequency modulator is significantly improved.