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. 10, 1987
Filed:
Dec. 22, 1986
Michael E Rebeschini, Hanover Park, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A differential amplifier is provided which has a low systematic offset voltage and a small variation in quiescent current with respect to variations in processing and temperature while providing low input referred noise and good output drive capability. Each transistor of a differential input pair of transistors is coupled to a plurality of series-connected transistors which are fabricated with substantially equal control electrode dimensions to form composite load tranistors. An output stage having conventional source and sink transistors is coupled to the differential pair of transistors. The sink transistor is implemented as a composite transistor by a plurality of parallel-connected transistors, each also having substantially the same control electrode dimension. Since all the ratioed transistors have equal control electrode dimensions, variations over processing and temperature are minimized. The composite load transistors have a large effective gate length for low input referred noise, and the composite transistor of the output stage has a small effective gate length to provide good drive capability.