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:
May. 10, 1994
Filed:
Nov. 25, 1992
Applicant:
Inventor:
Risto Vaisanen, Salo, FI;
Assignee:
Nokia Mobile Phones Ltd., Salo, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03C / ; H03D / ;
U.S. Cl.
CPC ...
332105 ; 329305 ; 329306 ; 455214 ; 455337 ; 307321 ; 328208 ;
Abstract
An IQ modulator/demodulator wherein the 90.degree. phase quadrature branches of an input signal are connected to different terminals of a common bridge, from which also the quivalents I and Q signals are obtained. To the bridge is also connected a local oscillator signal through a transformer. The transformer can be replaced with an active circuit, whereby the entire demodulator can be implemented in the form of an integrated circuit.