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. 10, 2002
Filed:
Jul. 30, 2001
Chuming David Shih, Chandler, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An active bias circuit connected to a power amplifier PA maintains a power amplifier DC quiescent current at a fixed value over a wide temperature range. The active bias circuit includes first and second current mirror circuits . The power amplifier PA is an element of the second current mirror circuit . A temperature compensation circuit is connected to the first current mirror circuit for providing temperature compensation therewith. A first reference voltage source is connected to the first current mirror circuit by way of the temperature compensation circuit for providing a first reference voltage Vref to the first current mirror circuit . A current sink is connected to a transistor of the first current mirror circuit and a voltage source adjustment circuit is connected to the first current mirror circuit for setting a voltage provided to the first current mirror circuit