Dynamic error vector magnitude duty cycle correction
First Claim
1. A method of biasing a power amplifier arranged to amplify a radio frequency signal, the method comprising:
- low pass filtering an indication of duty cycle of the power amplifier to generate a correction signal, the indication of duty cycle being a binary signal;
generating a bias signal based at least partly on the correction signal; and
biasing the power amplifier with the bias signal so as to compensate for variation in gain of the power amplifier due to a change in the duty cycle of the power amplifier.
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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.
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Citations
20 Claims
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1. A method of biasing a power amplifier arranged to amplify a radio frequency signal, the method comprising:
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low pass filtering an indication of duty cycle of the power amplifier to generate a correction signal, the indication of duty cycle being a binary signal; generating a bias signal based at least partly on the correction signal; and biasing the power amplifier with the bias signal so as to compensate for variation in gain of the power amplifier due to a change in the duty cycle of the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of biasing a power amplifier arranged to amplify a radio frequency signal, the method comprising:
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low pass filtering an indication of duty cycle of the power amplifier to generate a correction signal; generating a bias signal based at least partly on the correction signal, the generating being performed such that changes in the bias signal are inversely proportional to changes in the duty cycle of the power amplifier; and biasing the power amplifier with the bias signal so as to compensate for variation in gain of the power amplifier due to a change in the duty cycle of the power amplifier. - View Dependent Claims (8, 9)
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10. A power amplifier system with dynamic error vector magnitude compensation, the power amplifier system comprising:
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a power amplifier configured to amplify a radio frequency signal; a duty cycle tracking circuit configured to track a duty cycle of the power amplifier and to provide a signal representative of the duty cycle of the power amplifier; and a bias circuit configured to generate a bias signal based at least partly on the signal representative of the duty cycle of the power amplifier such that changes in the bias signal have an inverse relationship with changes in the duty cycle of the power amplifiers and to bias the power amplifier using the bias signal so as to compensate for dynamic error vector magnitude. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A wireless communication device with dynamic error vector magnitude compensation and arranged for communication using a wireless local area network protocol, the wireless communication device comprising:
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a power amplifier configured to provide a wireless local area network signal; a duty cycle tracking circuit configured to generate a signal representative of the duty cycle of the power amplifier; a bias circuit configured to generate a bias signal based at least partly on the signal representative of the duty cycle of the power amplifier such that changes in the bias signal have an inverse relationship with changes in the duty cycle of the power amplifier, and the bias circuit is configured to bias the power amplifier using the bias signal so as to compensate for dynamic error vector magnitude; and an antenna configured to transmit the wireless local area network signal. - View Dependent Claims (17, 18, 19, 20)
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Specification