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:
Nov. 12, 1996
Filed:
May. 23, 1995
Madhav V Kolluri, Sunnyvale, CA (US);
Maxim Integrated Products, Sunnyvale, CA (US);
Abstract
A simple high speed precision transconductance amplifier circuit having a low offset. The circuit uses as an input stage two substantially identical transistors of a first conductivity type connected in series so as to have the same current there through, neglecting base currents. A second stage uses two substantially identical transistors of a second conductivity type connected in series, with the output of the amplifier being a current mirrored from the second stage. The offset is maintained low by maintaining the V.sub.BE of the transistors in the two stages substantially identical by connecting together the base and collector of one of the transistors in one stage and coupling the resulting V.sub.BE of the transistor so coupled to one of the transistors of opposite conductivity type in the other stage. Various embodiments and variations are disclosed.