公开(公告)号：US20200304082A1

公开(公告)日：2020-09-24

申请号：US16765668

申请日：2017-12-15

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Andreas Langer ,  Otto Schumacher

IPC: H03F3/24 ,  H03F3/195 ,  H03F1/02 ,  H03F1/32 ,  H04B1/38

Abstract: A device for digital envelope tracking with dynamically changing voltage levels for a radio frequency (RF) power amplifier is disclosed. A power management unit generates a set of supply voltages for a power amplifier based on a control signal. A setpoint generator in the power management integrated circuit gradually increases or decreases a target voltage such that the set of supply voltages output from the voltage converter gradually increase or decrease in response to a gradual transition of the target voltage. A transceiver includes digital models for replicating a behavior of the setpoint generator and a voltage regulator in the voltage converter such that a signal pre-distortion unit may use an instantaneous voltage level for signal predistortion.

公开(公告)号：US11121684B2

公开(公告)日：2021-09-14

申请号：US16765668

申请日：2017-12-15

Applicant: Apple Inc.

Inventor： Stephan Henzler ,  Andreas Langer ,  Otto Schumacher

IPC: H03F1/30 ,  H03F3/24 ,  H03F1/02 ,  H03F1/32 ,  H03F3/195 ,  H04B1/38

Abstract: A device for digital envelope tracking with dynamically changing voltage levels for a radio frequency (RF) power amplifier is disclosed. A power management unit generates a set of supply voltages for a power amplifier based on a control signal. A setpoint generator in the power management integrated circuit gradually increases or decreases a target voltage such that the set of supply voltages output from the voltage converter gradually increase or decrease in response to a gradual transition of the target voltage. A transceiver includes digital models for replicating a behavior of the setpoint generator and a voltage regulator in the voltage converter such that a signal pre-distortion unit may use an instantaneous voltage level for signal predistortion.