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:
Sep. 10, 2002
Filed:
Feb. 18, 1999
Martin Hill, Bentley, AU;
Curtin University of Technology, Bentley, AU;
Abstract
A digital frequency detector ( ) and method for digitally detecting arbitrarily small phase changes between a signal waveform and a reference waveform. Both the reference waveform and the signal waveform are sampled at a rate related to the clock frequency f , and separately fed into two arrays of simple frequency detectors ( ). Each simple frequency detector in each array has a different starting phase with respect to the reference waveform and the signal waveform respectively. Phase slips between the reference waveform and the sampling frequency and phase slips between the signal waveform and the sampling frequency are measured by the detector arrays ( ). These phase slips, called “slip events”, are combined in circuit ( ) which produces an output indicative of phase slips between the reference waveform and the signal waveform. Using this phase slip information, the instantaneous frequency difference between the signal and reference waveforms can be determined.