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:
Feb. 09, 1988
Filed:
Jun. 30, 1986
William F Davis, Tempe, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A differential amplifier in which the offset voltage is adjustable and which has a zero temperature coefficient after being adjusted. The differential amplifier includes a pair of differentially connected transistors, a current mirror circuit coupled to the collectors of the pair of transistors for providing differential to single current conversion and a current source for supplying a thermal current to the interconnected emitters of the pair of transistors. The magnitude of the thermal current is proportional to absolute temperature and inversely proportional to a resistance of a given resistivity. Trimmable resistive elements are provided for adjusting any offset voltage appearing between the base electrodes of the pair of transistors to substantially zero volts with the adjusted offset voltage being temperature independent.