| 摘要 |
A method of controlling an envelope tracking amplification stage comprising: in a characterization mode: measuring parameters of the amplification stage to determine at least two of gain, phase and efficiency characteristics for instantaneous values of input power and supply voltage of the amplifier; and for the at least two of gain, phase and efficiency characteristics, generating a three-dimensional plot representing the characteristic with respect to input power and supply voltage applied to the amplifier, and in a use mode: using at least one of the three-dimensional plots to determine a shaping function for the shaping table in dependence on a primary system objective associated with one or more of gain, phase or efficiency; and using the determined shaping function and at least one of the three dimensional plots to determine the pre-distortion coefficients for the pre-distortion block to meet a secondary system objective associated with at least one of gain, phase or efficiency. |
