Title:
CONTINUOUS BIAS CIRCUIT AND METHOD FOR AN AMPLIFIER
Document Type and Number:
WIPO Patent Application WO2004036739
Kind Code:
A3
Abstract:
An amplifier and a bias circuit are disclosed. The bias circuit receives an analog voltage signal that reflects a desired output power level of the amplifier. The bias circuit causes the amplifier to draw a quiescent current, from a fixed-level DC voltage supply, that varies proportionally with the analog voltage signal. In this way, the current consumption of the amplifier is optimized for the desired output power level, while maintaining a desired, high degree of linearity. The amplifier and bias circuit may be in a wireless communications device that includes a baseband processor. The baseband processor generates the analog voltage signal, and a data signal that is converted to a RF signal. The RF signal is amplified by a preamplifier to a power level determined by the analog voltage signal. The RF signal is output to the amplifier for further amplification, and subsequently is broadcast through an antenna.
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Inventors:
HENDERSON GREGORY N
SOUCHUNS CHRISTOPHER C
LIU LI
LI PING
TANG ON SAN ANDY
IMHOFF ASHLEY A
SOUCHUNS CHRISTOPHER C
LIU LI
LI PING
TANG ON SAN ANDY
IMHOFF ASHLEY A
Application Number:
PCT/US2003/032479
Publication Date:
January 20, 2005
Filing Date:
October 14, 2003
Export Citation:
Assignee:
TRIQUINT SEMICONDUCTOR INC (US)
International Classes:
H03F1/02; H03F1/30; H03F1/32; H03F3/343; H04B1/04; (IPC1-7): H03G3/10
Foreign References:
| US20040108901A1 | 2004-06-10 | |||
| US20030201834A1 | 2003-10-30 | |||
| US20020101287A1 | 2002-08-01 | |||
| US6111464A | 2000-08-29 |
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