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:
Mar. 20, 1990
Filed:
Dec. 30, 1987
Applicant:
Inventors:
Assignee:
S.G.S.-Thomson Microelectronics S.r.l., Milan, IT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455326 ; 455338 ;
Abstract
An integrated coupling circuit for coupling a modulator to a ceramic filter in amplitude modulation receivers, which modulator includes an output stage comprising a pair of differential cells parallel-connected to each other. The coupling circuit comprises a pair of transistors connected to each other through their respective bases and forming a bridge circuit with a diode and third transistor. Each transistor in the pair is connected in a cascode configuration and powered from a respective current mirror circuit connected to an output terminal of the modulator.