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:
Nov. 09, 1982
Filed:
Nov. 19, 1980
Haruo Tamada, Yokohama, JP;
Osamu Kudo, Tokyo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A differential amplifier, which is associated with a digital-to-analog converter and a register and serves as an element of an analog-to-digital converter, having the offset input voltage characteristic determined by selecting, for example, the ratio of the emitter areas of a first pair of transistors so that no offset characteristic is required for the digital-to-analog converter associated with the differential amplifier. The offset input voltage can also be determined by selecting the ratio of the emitter areas of a second pair of transistors each one of the second pair of transistors connected to a different one of the first transistors and each one of the second pair of transistors having a current source of the same magnitude. The offset characteristic can also be determined by selecting unequal magnitudes of the current sources connected to the second pair of transistors when the ratio of the second pair of transistor emitter areas are equal. The offset characteristic can also be selected by selecting both the second pair of transistors emitter areas ratios and the second transistor current source magnitudes as not equal or by selecting any combination of the above current magnitudes or emitter area ratios.