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:
Aug. 17, 1999
Filed:
Sep. 08, 1997
Motorola, Inc., Schaumburg, IL (US);
Abstract
In a circuit (200), a differential pair (217/227) of transistors (210 and 220) receives a differential input signal (X.sub.1 -X.sub.2) from input terminals (211 and 221) and provides a differential output signal (Y.sub.1 -Y.sub.2) to output lines (215 and 225). The differential pair (217/227) is powered from a common constant current source (290) at a common node (205). Nonlinearities, such as cubic terms in a transfer function H=(Y.sub.1 -Y.sub.2)/(X.sub.1 -X.sub.2) caused by the transistors are compensated by compensation circuits (237 and 247). The compensation circuits (237 and 247) are coupled between the node (205) and the output lines (215 and 225). The compensation circuits (237 and 247) are controlled by the input signal (X.sub.1 -X.sub.2) and drain current from the node (205). Thereby, the currents going into the transistors (210 and 220) and the transistors gains (Y.sub.1 /X.sub.1 and Y.sub.2 /X.sub.2) are modified, so that nonlinearities are substantially canceled.