Method and system for amplifier control
AssigneeSiGe Semiconductor Inc.
InventorsAlan Trainor, Darcy Poulin, Craig Christmas
Life of this patent
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Abstract
A method is disclosed wherein a power level indicating a level of transmission power from an amplifier is provided. An indication of at least one of channel, channel bandwidth, OOB spectral requirements, spectral mask requirements, EVM, modulation rate, and modulation type is also provided. A control signal for controlling one of a bias current provided to the amplifier and a matching circuit for matching an output port of at least a stage of the amplifier is generated, the control signal determined in dependence upon the power level and the at least an indication. Then the one of the bias current and the matching circuit is adjusted in accordance with the control signal.
Claims9
An amplifier circuit comprising:
- an amplifying transistor configured to receive an input RF signal, provide an output amplified RF signal, and receive a first bias current;
- and
- a control circuit configured to determine the first bias current for the amplifying transistor dependent upon an error vector magnitude (EVM) target, an operating point, and an operating channel of the amplifier circuit, and to provide the first bias current to the amplifying transistor through a control signal, the first bias current being different for channels at an edge of a channel band than for channels nearer a center of the channel band, the first bias current being determined for to improve an amplifier efficiency of operation relative to that of an amplifying transistor with a fixed bias current.
Dependencies are inferred from the claim text.