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:
Oct. 16, 1990
Filed:
Jul. 05, 1989
Applicant:
Inventors:
James B Tsui, Centerville, OH (US);
William S McCormick, Dayton, OH (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 / ; 324 / ;
Abstract
The IFM receiver employs only two delay lines, thereby simplifying the IFM receiver design. The basic principle is to use two delay lines to provide fine frequency resolution, and at the same time cover a wide input bandwidth. The two delay line lengths must be relatively prime. The algorithm for achieving frequency resolution is based on the Chinese remainder theorem. That theorem states that if an unknown number X is divided by a with a remainder r.sub.1 and also divided by b with a remainder r.sub.2, where a and b are relatively prime numbers, the number X can be determined from a, b, r.sub.1, and r.sub.2 is X<ab.