DETERMINATION OF ENVELOPE SHAPING AND SIGNAL PATH PREDISTORTION OF AN ET AMPLIFICATION STAGE USING DEVICE CHARACTERISATION DATA
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Abstract
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.
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Citations
41 Claims
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1-21. -21. (canceled)
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22. A method of controlling an envelope tracking amplification stage comprising an amplifier for amplifying an input signal, an envelope tracking modulated power supply for generating a modulated supply voltage for the amplifier in dependence on the input signal envelope, and in which the input signal envelope to the envelope tracking modulated supply voltage is shaped by a shaping function, and a pre-distortion block for pre-distorting the input signal to the amplifier, the method comprising:
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a. in a characterisation mode of the amplifier under test conditions; i. 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 ii. for each of 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 b. in a use mode of the amplifier under normal operating conditions; iii. 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 iv. 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. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A control system for controlling an envelope tracking amplification stage comprising an amplifier for amplifying an input signal, an envelope tracking modulated power supply for generating a modulated supply voltage for the amplifier in dependence on the input signal envelope, and in which the input signal envelope to the envelope tracking modulated supply voltage is shaped by a shaping function, and a pre-distortion block for pre-distorting the input signal to the amplifier, the control system adapted to:
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a. in a characterisation mode of the amplifier under test conditions; i. measure parameters of the amplification stage to determine sets of two or more of gain, phase and efficiency characteristics for instantaneous values of input power and supply voltage of the amplifier; and ii. for each of the two or more of gain, phase and efficiency characteristics, generate a three-dimensional plot representing the characteristic with respect to input power and supply voltage applied to the amplifier, and b. in a use mode of the amplifier under normal operating conditions; iii. use 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 iv. use 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. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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41. A control system for controlling an envelope tracking amplification stage comprising an amplifier for amplifying an input signal, an envelope tracking modulated power supply for generating a modulated supply voltage for the amplifier in dependence on the input signal envelope, and in which the input signal envelope to the envelope tracking modulated supply voltage is shaped by a shaping function, and a pre-distortion block for pre-distorting the input signal to the amplifier, the control system comprising:
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a. in a characterisation mode of the amplifier under test conditions; i. measuring circuitry for measuring parameters of the amplification stage to determine sets of two or more of gain, phase and efficiency characteristics for instantaneous values of input power and supply voltage of the amplifier; and ii. generating circuitry for each of the two or more of gain, phase and efficiency characteristics, for generating a three-dimensional plot representing the characteristic with respect to input power and voltage applied at the amplifier, and b. in a use mode of the amplifier under normal operating conditions; iii. determining circuitry for 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 iv. determining circuitry for 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.
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Specification