Baseband linearizer for wideband, high power, nonlinear amplifiers
AssigneeCanadian Patents and Development Limited
InventorHenri Girard
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Abstract
The baseband linearizer attenuates the amplitude of the in-phase and quadrature phase components of the baseband signal as a function of the transfer characteristic of the high power amplifier and under the control of a baseband signal power level detector. The phase angle of the attenuated signal is rotated as a function of the amplifier transfer characteristic, again under the control of the power level detector.
Claims4
A baseband linearizer for a high power amplifier in a modulation transmission system wherein in-phase X and quadrature phase Y components of a baseband signal are filtered through low pass filters, comprising:
- first means for receiving the filtered in-phase X and quadrature phase Y components of the baseband signal and attenuating the amplitudes of the baseband signal X, Y components as a function of the high power amplifier transfer characteristics;
- second means for receiving the attenuated baseband signal X', Y' components and rotating the phase angle of the attenuated baseband signal X', Y' components as a function of the high power amplifier transfer characteristic, and
- means for detecting the power level of the filtered in-phase X and quadrature phase Y components of the baseband signal for controlling the first means and the second means.
Dependencies are inferred from the claim text.