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. 21, 1997
Filed:
Feb. 28, 1996
Grant H Watkins, Dunkirk, MD (US);
Norman G Matthews, Sparks, MD (US);
Aldez C Hazzard, Jessup, MD (US);
John P Muhlbaier, Joppa, MD (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
A low cost direct frequency synthesizer is structured to operate with moderate bandwidth, good noise performance, superior spurious performance, and fast switching. The direct frequency synthesizer employs a starter frequency signal f.sub.o (33-1) and a set of LO frequency signals f.sub.1 through f.sub.n (35-1) spaced from each other by a frequency increment .delta.. A mixer circuit (34-1) generates a product of the starter frequency signal and the LO frequency signals. A divider (31-1) has a divider ratio equal to N. The number of LO frequency signals is equal to or less than N. The starter frequency f.sub.o has a value equal to .delta. times (N+x) where x is equal to 0 or a positive integer. The LO frequency f.sub.1 has a value equal to (N+1)f.sub.o. An intermediate nonswitchable band pass filter (36-1) passes a difference portion of the mixer product to the divider, and a nonswitchable output band pass filter (38-1) receives an output from the divider to generate a moderate bandwidth output.