Band-based amplifier linearity adjustment
AssigneeSiGe Semiconductor Inc.
InventorsAlan J. A. Trainor, Grant Darcy Poulin, Craig Joseph Christmas
Life of this patent
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Abstract
A system improve amplifier efficiency of operation relative to that of an amplifier with fixed biasing is operating channel dependent. A control circuit determines a bias current for an amplifying transistor of an amplifier circuit based at least in part on an operating channel. The amplifying transistor operates in a multi-channel system, where the bias current for the amplifying transistor operating at channels at an edge of a channel band is different from the bias current for the amplifying transistor operating at channels nearer a center of the channel band.
Claims20
An amplifier circuit comprising a control circuit configured to determine a bias current for an amplifying transistor based at least in part on an operating channel, the amplifying transistor configured to operate in a multi-channel system, the bias current for the amplifying transistor operating at channels at an edge of a channel band being different from the bias current for the amplifying transistor operating at channels nearer a center of the channel band.
A method to determine bias current based at least in part on an operating channel, the method comprising:
- determining a first bias current for an amplifying transistor when the amplifying transistor is operating at channels at an edge of a channel band, the amplifying transistor configured to operate in a multi-channel system;
- and
- determining a second bias current for the amplifying transistor when the amplifying transistor is operating at channels nearer a center of the channel band, the second bias current different from the first bias current.
A wireless communication device comprising:
- an antenna configured to transmit an amplified radio frequency output signal;
- and
- an amplifier circuit configured receive a radio frequency input signal and to amplify the radio frequency input signal to provide the amplified radio frequency output signal, the amplifier circuit including a control circuit configured to determine a bias current for an amplifying transistor based at least in part on an operating channel, the amplifying transistor configured to operate in a multi-channel system, the bias current for the amplifying transistor operating at channels at an edge of a channel band being different from the bias current for the amplifying transistor operating at channels nearer a center of the channel band.
Dependencies are inferred from the claim text.