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:
Dec. 25, 2012
Filed:
Dec. 07, 2010
Thomas Y. Wong, Markham, CA;
Thomas Y. Wong, Markham, CA;
ATI Technologies ULC, Markham, Ontario, CA;
Abstract
An apparatus includes a telescopic operational amplifier. The telescopic operational amplifier includes an input stage, a load, and a first cascode circuit. The first cascode circuit is coupled to a first differential node and an output node. The first differential node is coupled to one of the input stage and the load. The apparatus includes a first negative transconductance circuit coupled to the first differential node. In at least one embodiment, the first negative transconductance circuit is operable to provide a negative transconductance to compensate at least a first component of an output resistance of the telescopic operational amplifier. In at least one embodiment, the first negative transconductance circuit includes a pair of cross-coupled devices coupled to the first differential node and a current source.