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:
Apr. 16, 2002
Filed:
Oct. 28, 1994
Shifting of frequency range and bandwidth of receivers using a mixer attenuating the image frequency
Applicant:
Inventor:
Mikko Pesola, Märynummi, FI;
Assignee:
Nokia Mobile Phones Ltd., Salo, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 1/18 ;
U.S. Cl.
CPC ...
H04B 1/18 ;
Abstract
The circuit arrangement utilizes both outputs of a mixer attenuating the image frequency, whereby one of the desired frequency bands is obtained from a “signal port” and the other desired frequency band from the “port of the image signal”. Thus a desired intermediate frequency signal band (IF) corresponding to the radio frequency Input signal (RF) can be selected using a switch ( ), the intermediate frequency signal band (IF) being filtered by an intermediate frequency filter ( ). The frequency (LO) of the local oscillator is selected to be in the middle of the radio bands (RF).