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:
Jun. 09, 2009
Filed:
Apr. 30, 2007
Madan G. Rallabandi, Tucson, AZ (US);
Scott C. Mcleod, Oro Valley, AZ (US);
Madan G. Rallabandi, Tucson, AZ (US);
Scott C. McLeod, Oro Valley, AZ (US);
Standard Microsystems Corporation, Hauppauge, NY (US);
Abstract
An operational amplifier including an input stage. The input stage may include first and second differential input circuits and a first current mirror. When an input terminal of the operational amplifier is at a positive voltage rail, the first differential input circuit may be activated. When the input terminal is at a negative voltage rail, the second differential input circuit may be activated. In either case, this may cause the first current mirror to provide a current of a predetermined value to each of first and second input terminals of a control circuit, and to each of first and second nodes coupled to a rail-to-rail output stage. The input stage may maintain the current provided to each of the input terminals of the control circuit and to each of the nodes coupled to the rail-to-rail output stage constant over the full input voltage range from the negative voltage rail to the positive voltage rail.