Gain and phase calibration for closed loop feedback linearized amplifiers

摘要

Embodiments of a radio frequency (RF) amplification device having an RF amplification circuit and an amplifier control circuit operably associated with the RF amplification circuit are disclosed. The RF amplification circuit is configured to amplify an RF signal in accordance with a transfer function. The amplifier control circuit includes a closed-loop linearization circuit and a calibration circuit. The closed-loop linearization circuit is configured to be activated so that the transfer function defines a closed-loop response and inactive so that the transfer function defines an open-loop response. For example, the closed-loop linearization circuit may become inactive at small-signal power levels. Accordingly, the amplifier control circuit also includes a calibration circuit configured to reduce a difference between the open-loop response and the closed-loop response of the transfer function. In this manner, the performance of the RF amplification device is maintained while the closed-loop linearization circuit is inactive.

主权项

1. A radio frequency (RF) amplification device, comprising:
an RF amplification circuit configured to receive an RF signal and generate an amplified RF signal in accordance with a transfer function; and an amplifier control circuit operably associated with the RF amplification circuit wherein the amplifier control circuit comprises:
a closed-loop linearization circuit configured to be activated such that the transfer function of the RF amplification circuit defines a closed-loop response and inactivated such that the transfer function of the RF amplification circuit defines an open-loop response; anda calibration circuit configured to control the RF amplification circuit to reduce a difference between the open-loop response and the closed-loop response of the transfer function based on a difference of the RF signal and the amplified RF signal.