Pmc-sierra, Inc.

Francis Beaudoin

Matthew W McAdam

A biasing circuit and method for minimizing distortion in a MOS transistor. A first CW source provides a first CW signal at the input of a replica transistor to obtain an output signal at the output of the replica transistor. The output signal is mixed with another CW signal having a frequency equal to N times that of the first CW signal, N being an integer greater than one, to obtain a mixed signal having a DC component with an intensity proportional to the N-order distortion present in the output signal. A bias voltage to minimize this distortion is then applied to the input of the original transistor on which the replica transistor is based, the bias voltage determined in accordance with the intensity of the DC component.

Continuous wave based bias method and apparatus for minimizing MOS transistor distortion

Methods and apparatus control the gain of an RF amplifier. In an example, the RF amplifier is biased for low distortion. The bias is not changed to adjust gain. Rather, the amplifier's gain is controlled by selectively activating or deactivating RF amplifier cells of the RF amplifier. This individual RF amplifier cells to be biased for good linearity and relatively good spectral performance, while permitting gain control.

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Brossard, Canada

Francis Beaudoin