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:
Sep. 21, 1982
Filed:
Sep. 22, 1980
Robert R Cordell, Tinton Falls, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
An integrated circuit current source (10) has first (16) and second (30) current mirrors regeneratively coupled. The transistors (32, 34) of the second mirror (30) have unequal current densities, so that a resistor (40) connected to the emitter of the lower current density transistor (34) establishes a temperature-dependent output current. One of the transistors (18, 20, 34) has its base and emitter connected together through a modifying resistor (42, 53, 55) to modify the temperature dependence of the output. In one embodiment (10), the modifying resistor (42) connects the base and emitter of the lower current density transistor (34) and increases the temperature dependence of the output to make it directly proportional to the absolute temperature. Other embodiments (52, 54) are disclosed for obtaining both zero and negative temperature coefficient values for the output.