Patent ID: 9225289
Filing Date: 2015-12-29
Classification: H03F,H04B

Abstract:
1. A partial envelope tracking (PET) circuit for improving the dynamic range of a power amplifier amplifying high bandwidth signals, comprising: a main supply path having a main valve (MV) connecting the power amplifier to a first power source; a storage capacitor connecting a junction node and the power amplifier; a supplementary supply path including a diversion valve (DV) and a tracking valve (TV), each of the diversion valve and the tracking valve connecting, in parallel between a second power source and the junction node; a supplementary current path including a grounding valve (GV) connecting the junction node and a ground; and a valves control unit (VCU) configured to monitor an envelope tracking parameter to determine an operation mode of the circuit and a state of each of the main valve, the grounding valve, the diversion valve, and the tracking valve during each respective mode of operation, wherein the operation mode is any one of: a tracking mode and a normal mode, wherein during the normal mode the storage capacitor is charged to a voltage level provided by the first power source and during the tracking mode the storage capacitor is discharged, when the PET circuit switches from the normal mode to the tracking mode, a source of a drain current to the power amplifier transitions from the first power source to a current path through the diversion valve and the storage capacitor and, thereby enabling smooth transitions between the normal mode and the tracking mode.