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:
Dec. 05, 1995
Filed:
Jan. 18, 1994
Volker Thomas, Munchen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An integratable current source circuit for generating an output current proportional to an input current includes a first transistor of one conduction type, and second, third and fourth transistors of the other conduction type. Each of the transistors has a base, a collector and an emitter. The first transistor has a current amplification being greater than current amplifications of the second, third and fourth transistors. An input terminal feeds an input current, and an output terminal taps an output current. A current source on one hand is connected to a reference potential and on the other hand is connected to the emitter of the first transistor and to the base of the second transistor. The collector of the second transistor is connected to the reference potential and the emitter of the second transistor is coupled to the base of the third transistor and to the base of the fourth transistor. The base of the first transistor is connected to the collector of the third transistor and to the input terminal. The collector of the fourth transistor is connected to the output terminal. The collector of the first transistor and the emitters of the third and fourth transistors are connected to a supply potential.