Dynamic error vector magnitude duty cycle correction

摘要

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.

主权项

1. An apparatus comprising:
an amplifier configured to amplify an input signal; a low pass filter configured to receive an indication of a duty cycle of the amplifier and to generate a correction signal based at least partly on the indication of the duty cycle of the amplifier, the indication of duty cycle being a binary signal having an activated state corresponding to the amplifier being enabled and a deactivated state corresponding to the amplifier being disabled; and a bias circuit configured to generate a bias signal based at least partly on the correction signal such that changes in the bias signal are inversely proportional to changes in the duty cycle of the amplifier, and the bias circuit configured to bias the amplifier using the bias signal so as to compensate for a variation in gain of the amplifier from thermal effects as the duty cycle of the amplifier changes.