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. 31, 1999
Filed:
Dec. 15, 1997
James A Antone, Edwards, IL (US);
William J Love, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A current mirror circuit is provided including a first and second transistors of a first conductivity type, the first transistor having a base connected to a base of the second transistor forming a base junction. A third transistor which is of a second conductivity type is connected in series with the first transistor and a collector of the third transistor is connected to the base junction of the first and second transistors. A fourth transistor which is of the second conductivity type is connected in series with the second transistor and has a base connected to a base of the third transistor forming a base junction. A collector of the second transistor is connected to the base junction of the third and fourth transistors. A first resistor is connected between an emitter of the third transistor and ground and a second resistor is connected between an emitter of the fourth transistor and ground. The circuit provides current matching over the first and second resistors where such resistors have about the same resistance values.