DYNAMIC ERROR VECTOR MAGNITUDE DUTY CYCLE CORRECTION
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Accused Products
Abstract
Aspects of this disclosure relate to dynamic error vector magnitude (DEVM) compensation. In one embodiment, an apparatus includes an amplifier, a low pass filter, and a bias circuit. The amplifier, such as a power amplifier, can amplify an input signal. The low pass filter, such as an integrator, can generate a correction signal based at least partly on an indication of a duty cycle of the amplifier. The indication of the duty cycle of the amplifier can be an enable signal for the amplifier, for example. The bias circuit can generate a bias signal based at least partly on the correction signal and provide the bias signal to the amplifier to bias the amplifier.
4 Citations
21 Claims
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1. (canceled)
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2. A power amplifier system with dynamic error vector magnitude compensation, the power amplifier system comprising:
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a power amplifier configured to provide a radio frequency signal; a duty cycle tracking circuit configured to generate a correction signal that is representative of a duty cycle of the power amplifier over time; and a bias circuit configured to adjust a bias signal based on the correction signal such that the bias signal is larger for a lower duty cycle of the power amplifier than for a higher duty cycle of the power amplifier, and to bias the power amplifier using the bias signal so as to compensate for dynamic error vector magnitude. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless communication device with dynamic error vector magnitude compensation, the wireless communication device comprising:
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a power amplifier configured to provide a radio frequency signal; a duty cycle tracking circuit configured to generate a correction signal that is representative of a duty cycle of the power amplifier over time; a bias circuit configured to adjust a bias signal based on the correction signal such that the bias signal is larger for a lower duty cycle of the power amplifier than for a higher duty cycle of the power amplifier, and to bias the power amplifier using the bias signal so as to compensate for dynamic error vector magnitude; an antenna configured to transmit the radio frequency signal; and switches configured to selectively electrically couple an output of the power amplifier to the antenna. - View Dependent Claims (12, 13)
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14. A method of amplifier biasing with dynamic error vector magnitude compensation, the method comprising:
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generating a correction signal that is representative of a duty cycle of an amplifier over time; adjusting a bias signal based on the correction signal such that the bias signal is larger for a lower duty cycle of the amplifier than for a higher duty cycle of the amplifier; and biasing the amplifier with the bias signal so as to compensate for change in a parameter of the amplifier due to a change in the duty cycle of the amplifier. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification