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. 01, 1981
Filed:
Apr. 30, 1979
Horst Leuschner, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A bandgap voltage reference source is provided which is temperature stable or temperature controlled and can be made by standard CMOS process. The reference has two substrate bipolar transistors with the emitter current density of one of the transistors being larger than the emitter current density of the other transistor. The transistors are used as emitter followers having resistors in their emitter circuits from which an error voltage is obtained. The error voltage is amplified through a differential or operational amplifier. Through the amplifier or through a resistor network, an output voltage higher or lower, respectively, than the bandgap voltage can be obtained. The output voltage can be made to have a positive, negative, or zero temperature coefficient.