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:
Feb. 22, 2022
Filed:
Sep. 15, 2020
Applicant:
Advantest Corporation, Tokyo, JP;
Inventors:
Koji Asami, Tokyo, JP;
Takahiro Kudo, Tokyo, JP;
Assignee:
ADVANTEST CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 3/46 (2015.01); H04B 17/00 (2015.01); H04B 17/10 (2015.01); H04B 17/20 (2015.01); H04B 1/04 (2006.01); H04B 1/16 (2006.01); H04L 5/00 (2006.01); H04L 25/03 (2006.01); H04L 27/26 (2006.01);
U.S. Cl.
CPC ...
H04B 17/0085 (2013.01); H04B 1/04 (2013.01); H04B 1/16 (2013.01); H04B 17/10 (2015.01); H04B 17/20 (2015.01); H04L 5/001 (2013.01); H04L 25/03 (2013.01); H04L 27/2627 (2013.01);
Abstract
A front-end circuit is used to test an RF signal from an RF device. The RF signal is generated by modulating a carrier signal having a carrier frequency with a wideband baseband signal. A variable frequency oscillator generates a local signal having a variable local frequency. The first frequency mixer frequency mixes a local signal and an RF signal to generate an IF signal having a frequency. A band-pass type first filter filters the IF signal. The local frequency can be selected from a plurality of frequencies having a frequency interval equal to or narrower than a bandwidth of the first filter.