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:
Apr. 19, 1983
Filed:
Dec. 24, 1980
Robert S Wrathall, Tempe, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A voltage reference source is provided which is temperature stable and can be made by standard CMOS processes. The voltage reference can provide an output voltage which is equal to twice the bandgap voltage. The voltage reference circuit uses a differential amplifier which has an output coupled to an additional amplifying stage. Two substrate bipolar transistors are used wherein the emitter current density of one of the transistors is larger than the emitter current density of the other transistor. An additional transistor is inserted between the output of the amplifying stage and the substrate bipolar transistors thereby providing the output voltage of twice the bandgap voltage.