Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2009-01-23
2010-06-22
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S302000, C330S305000
Reexamination Certificate
active
07741912
ABSTRACT:
The present invention relates to amplifier bias circuitry, which provides a direct current (DC) bias to a radio frequency (RF) amplifier. The amplifier bias circuitry includes a control loop having a control loop bandwidth, and an output impedance associated with providing the DC bias to the RF amplifier. The amplifier bias circuitry may vary the DC bias, the output impedance, the control loop bandwidth, or any combination thereof, to meet wireless communications requirements. For example, in a multi-mode radio, low output impedance may be needed to meet linearity requirements of the RF amplifier associated with wireless communications protocols in one mode of the multi-modes; however, some low output impedance designs may reduce the control loop bandwidth below that needed to meet modulation requirements associated with wireless communications protocols in another mode of the multi-modes.
REFERENCES:
patent: 6359516 (2002-03-01), Luo et al.
patent: 6624700 (2003-09-01), Luo et al.
patent: 6794935 (2004-09-01), Klomsdorf et al.
patent: 6937101 (2005-08-01), Hageman et al.
patent: 7439806 (2008-10-01), Dow
Nguyen Patricia
RF Micro Devices, Inc.
Withrow & Terranova, P.L.L.C.
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