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:
Jan. 27, 2009
Filed:
Dec. 16, 2005
Jonathan D. Coker, Rochester, MN (US);
Robert A. Kertis, Rochester, MN (US);
Jonathan D. Coker, Rochester, MN (US);
Robert A. Kertis, Rochester, MN (US);
Mayo Foundation for Medical Education and Research, Rochester, MN (US);
Abstract
A chirp waveform generator for producing a chirp waveform ƒ(t)=sin (tmodulus m) where modulus m is represented by n submoduli and/or factored submoduli m-m. Sequence generators generate digital sequence values representative of sequences of quadratic residues for each submoduli and/or factored submoduli m-m. Sine and cosine digital-to-analog converters (DACs) connected to the sequence generators receive the digital sequence values for each submoduli and/or factored submoduli m-mand produce sequences of corresponding analog sine and cosine signals. An analog processor including adders and multipliers connected to the DACs combines the sine and cosine signals to produce the chirp waveform. The argument (tmodulus m) is an implemented phase argument that approximates a desired phase argument (πrt). Programmable inputs on the sequence generators enable control over waveform parameters including starting phase, ramp rate and frequency.