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. 19, 1992
Filed:
Aug. 14, 1989
Applicant:
Inventor:
Richard Stepp, Munich, DE;
Assignee:
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06G / ; G06J / ;
U.S. Cl.
CPC ...
364841 ; 307498 ; 328160 ;
Abstract
A four-quadrant multiplier based on a Gilbert cell is utilized to multiply several signals by a similar signal. The transistors in two pairs of coupled differential amplifiers of one input terminal of the inner multiplier that is activated like a Gilbert cell by way of a diode-and-transistor section have several emitters. Each pair of emitters in the right and the left branch of the miltiplier can be oppositely activated by way of a source of variable current or by way of a series of a transistor and a source of current. To process square-wave signals, the source of variable current is a source that can be engaged and disengaged by I.sup.2 L gates.