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:
Dec. 26, 2000
Filed:
Oct. 13, 1998
Hirobumi Musha, Gyoda, JP;
Advantest Corp, Tokyo, JP;
Abstract
A frequency spectrum analyzer having an improved carrier to noise ration for analyzing frequency spectrum of an input signal. The spectrum analyzer includes a first frequency converter formed of a first frequency mixer, a first IF (intermediate frequency) filter and a first local signal oscillator; a second frequency converter; a third frequency converter formed of a third frequency mixer, a third IF filter and a third local signal oscillator; a frequency divider for dividing a frequency of the first local signal by a factor of N; a frequency multiplier for multiplying a frequency of the third local signal; a fourth frequency mixer which is provided with a divided frequency signal from the frequency divider as a fourth local signal; and a fifth frequency mixer which mixes the input signal to be analyzed and a multiplied frequency signal from the frequency multiplier as a fifth local signal and provides a frequency converted input signal to the fourth frequency mixer; where the fourth frequency mixer mixes the fourth local signal and the frequency converted input signal and provides a resultant IF signal to the third frequency converter.