| 摘要 |
One provides (401, 402) both an in-phase signal component (501) and a qua drature signal component (601) wherein the latter has a non-zero portion. Th ese two signal components are then combined (403) to provide a Cartesian tra ining waveform that can be used when training a linear amplifier that uses C artesian feedback linearization. By one approach, the non-zero portion of th e quadrature signal component can be coincident with a zero-crossing portion of the in-phase signal. In many application settings this non-zero portion of the quadrature signal component can be less (and sometimes considerably l ess) than a peak amplitude of the in-phase signal component. One may also sh ape the in-phase signal component to have a smoothed envelope. This may incl ude, for example, using a smoothed sine wave such as a raised-sine function.
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