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:
Apr. 02, 2002
Filed:
Apr. 06, 2000
Michael Maida, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An amplifier output stage including a PNP transistor having an emitter coupled to a power rail and a collector coupled to an amplifier output. The PNP transistor is driven by an NPN transistor having a collector coupled to the base of the PNP transistor. A bias circuit produces a base-emitter voltage across the PNP transistor so that the PNP transistor will conduct a desired quiescent current. The bias circuit has an effective output impedance which is sufficiently large to form a pole in combination with a frequency compensation capacitor coupled to the collector of the PNP transistor, with the pole being located at a frequency beyond the unity-gain frequency of the amplifier.