Method of calibrating the delay of an envelope tracking signal

摘要

Embodiments provide systems and methods for aligning the supply voltage signal applied to a power amplifier (PA) with the radio frequency (RF) output signal of the PA in a wireless device. The RF output signal is generated by applying a transmit signal to a transmit path of the wireless device. The supply voltage is generated by applying an envelope tracking (ET) signal, based on the transmit signal, to an envelope tracking (ET) path of the wireless device. Embodiments operate by estimating the delays of the ET path and the transmit path, and then controlling a relative delay between the transmit signal and the ET signal accordingly. In an embodiment, estimation of the delays of the ET path and the transmit path is done by correlating respective signals of each path.

主权项

1. A method for aligning a supply voltage signal applied to a power amplifier (PA) with a radio frequency (RF) output signal of the PA in a wireless device, wherein the RF output signal is generated by applying a transmit signal to a transmit path of the wireless device, and wherein the supply voltage signal is generated by applying an envelope tracking (ET) signal, based on the transmit signal, to an ET path of the wireless device, the method comprising:
correlating the supply voltage signal applied to the PA with the ET signal to estimate a first delay of the ET path; correlating a feedback signal generated by applying the RF output signal to a feedback path of the wireless device with the transmit signal to estimate a second delay of the transmit path; estimating a delay difference between the transmit path and the ET path based on the first delay and the second delay; and controlling a relative delay between the transmit signal and the ET signal based on the estimated delay difference to align the supply voltage signal applied to the PA and the RF output signal of the PA.