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:
Jul. 24, 2007
Filed:
Apr. 14, 2005
Sheldon Xu, Edison, NJ (US);
Thomas William Arell, Basking Ridge, NJ (US);
Mahendra Singh, Bridgewater, NJ (US);
Mohammed Ali Khatibzadeh, Hampton, NJ (US);
Sheldon Xu, Edison, NJ (US);
Thomas William Arell, Basking Ridge, NJ (US);
Mahendra Singh, Bridgewater, NJ (US);
Mohammed Ali Khatibzadeh, Hampton, NJ (US);
Anadigics, Inc, Warren, NJ (US);
Abstract
A power amplifier with a multi-mode digital bias control circuit is provided. The power amplifier utilizes a complementary reference voltage generation circuit and a bias current-control circuit to generate a plurality of bias current levels for different output power levels. In an embodiment of the present invention, the power amplifier circuit is connected to a reference voltage and two control signals. Depending on the desired output power level, the control signals set the corresponding bias current in the amplifying transistors, to ensure sufficient linearity. The power amplifier is capable of operating at a very low quiescent current level, for example, 5 mA. As a result, a significant improvement in the power amplifier's overall efficiency is achieved, and the battery talk time of a wireless communication device is increased. The invention finds application in wireless communication devices such as CDMA, WCDMA, EDGE and WLAN mobile devices.