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:
Jan. 14, 1992
Filed:
May. 29, 1990
Grady M Wood, Melbourne, FL (US);
Harris Corporation, Melbourne, FL (US);
Abstract
A band-gap reference having a differential amplifier with first and second inputs and an output, and a voltage divider coupled to the differential amplifier output. A first transistor having a base, emitter and collector, has its base coupled to the voltage divider, the first transistor having an emitter current density of x. A second transistor having a base, emitter and collector, has its base coupled to the voltage divider, the second transistor having an emitter current density of nx, where n is fixed. A third transistor having a base, emitter and collector, has its base coupled to the emitter of the first transistor, and its collector coupled to the first input of the differential amplifier. A fourth transistor having a base, emitter and collector, has its base coupled to the emitter of the second transistor, and its collector coupled to the second input of the differential amplifier, and the emitter of the fourth transistor being coupled to the emitter of the third transistor. The threshold voltage term for the band-gap reference is derived by setting the emitter current density for the input transistors of the differential amplifier at a fixed ratio, so that there is only one stable operating point, thereby eliminating the need for additional start-up circuitry and allowing the band-gap reference to be used in transient radiation environments.