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. 16, 1988
Filed:
Sep. 18, 1986
Applicant:
Inventors:
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ; H03F / ;
U.S. Cl.
CPC ...
330261 ; 330296 ; 330307 ; 357 51 ;
Abstract
An operational amplifier of the type which includes first and second differentially coupled input transistors which cooperate with a current mirror circuit also includes a first and second RTMM resistors which may be individually trimmed to reduce input offset voltage. Each RTMM resistor is coupled from the power supply rail through first and second diodes respectively to the first and second input terminals. In this manner, signals appearing on the input terminals which exceed the rail voltage will cause currents to flow through the RTMM resistors thus reducing their resistance, and reducing offset voltage.