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. 24, 1992
Filed:
Mar. 16, 1992
Scott A Wurcer, Cambridge, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A distortion cancellation amplifier system operational amplifier system includes a current mirror circuit having an input, an output and a common terminal; a device for providing a pair of differential current signals to the input and output terminals of the current mirror circuit; a control device, responsive to said output terminal of the current mirror circuit, for controlling the voltage at the common terminal to drive the voltage at the input terminal of said current mirror circuit to track the voltage on the output terminal of the current mirror circuit; an output amplifier stage having a predetermined gain and having an input and an output terminal with its input terminal connected to the output terminal of the current mirror circuit; a gain control device having a predetermined impedance connected with the input terminal of the output amplifier; and a distortion suppression device connected between the output terminal of the output amplifier and the input terminal of the current mirror circuit and having an impedance equal to the predetermined impedance of the gain control device divided by the predetermined gain of the output amplifier for cancelling signal distortion introduced by the output amplifier stage.