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:
Jan. 09, 2007
Filed:
Jun. 15, 2005
Thomas L. Botker, Tucson, AZ (US);
Benjamin A. Douts, Tucson, AZ (US);
Thomas L. Botker, Tucson, AZ (US);
Benjamin A. Douts, Tucson, AZ (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A chopper-stabilized current mirror includes a pair of FETs connected to mirror an input current I. In one embodiment, switching networks Sand Shave their respective inputs connected to the FETs' drains, and are operated with clock signals CLKand CLK, respectively. An rboost amplifier Ahas its inputs connected to the outputs of Sand its outputs connected to the gates of a pair of cascode FETs via a switching network Swhich is operated with clock signal CLKS, with the drain of one cascode FET connected to Iand the drain of the other providing the mirror's output I. Sis clocked to reduce mismatch errors and Sand Sare clocked to reduce errors due to A's offset voltage, with CLKand CLKS shifted with respect to CLKto reduce errors due to parasitic capacitances.