Patent ID: 11863210
Assignee: NANOSEMI, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 25:
26. An envelope tracking module comprising:
a receiver to receive an input signal u, the input signal u further provided to a digital predistorter coupled to a transmit chain comprising a power amplifier;
a controller to determine, based on amplitude variations of the input signal u, a time-varying signal, e, wherein the amplitude variations of the time-varying signal e correspond to time variations in non-linear characteristics of the transmit chain, wherein the controller configured to determine the time-varying signal, e, is configured to determine the time-varying signal e to cause a power supply modulator controlling the electrical operation of the transit chain to underpower the power amplifier so as to cause the transmit chain to operate in a non-linear mode; and
an output section to output the time-varying signal e;
wherein the digital predistorter is configured to receive another input signal that depends on the amplitude variations of the time-varying signal e, and to generate, based at least in part on signals comprising the input signal u and the other input signal, a digitally predistorted output, v, provided to the transmit chain, to mitigate non-linear behavior of the transmit chain.