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:
Aug. 04, 1987
Filed:
Dec. 03, 1984
Applicant:
Inventor:
Heinz Rinderle, Heilbronn, DE;
Assignee:
Telefunken Electronic GmbH, Heilbronn, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ; H03K / ;
U.S. Cl.
CPC ...
307525 ; 307271 ; 3072191 ; 328156 ; 328 15 ; 328160 ;
Abstract
In a mixer stage comprising a transistor for mixing, with the input signal and/or the oscillator signal being fed inductively to the mixing transistor, there is provided for inductively coupling the mixer transistor to the corresponding filter a coil which is magnetically coupled to this filter. The inductivity of the coupling coil is of such dimensions that the source impedance controlling the transistor to a greater than the input impedance of the mixer transistor when the filter is aligned.