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:
May. 26, 2009
Filed:
May. 09, 2007
Christian Ebner, Munich, DE;
Christian Ebner, Munich, DE;
National Semiconductor Germany AG, Unterhaching, DE;
Abstract
It is an object of the present invention to provide an amplifier circuit that supplies a differential output signal (Voutp−Voutn) with a stable common mode potential (½×(Voutp+Voutn)) and a stable amplification characteristic. An essential feature of the invention is a control path () feeding back into a control stage of the amplifier circuit for the combined control of the quiescent currents that flow through the output transistors (T-T), and of the common mode potential of the differential output signal. By means of this combination of two control functions in one and the same control path () any coupling between separate control loops is avoided.