Telefonaktiebolaget Lm Ericsson (publ)

Lg Electronics Inc.

Ossi Toivonen

Sami Vilhonen

A mobile terminal including an up-converter converting a baseband (BB) signal into a radio frequency (RF) signal and a controller controlling a voltage applied to the up-converter is provided. The up-converter includes a first transistor and a second transistor each having a gate to which a baseband voltage is applied, a third transistor having a drain connected in parallel to a drain of the first transistor, and a fourth transistor having a drain connected in parallel to a drain of the second transistor, and the up-converter and the mobile terminal with improved phase linearity characteristics may be provided.

Up-converter and mobile terminal having the same

A linearization circuit improves the linearity of a power amplifier based on an envelope of an input RF signal. The linearization circuit comprises an RF signal generation circuit, a replica circuit, and an adaptive amplifier. The RF signal generation circuit generates the RF signal from a phase and an amplitude of an input digital signal. The replica circuit extracts the envelope from the RF signal and generates a sensing voltage based on the extracted envelope. The adaptive amplifier generates an adaptive bias voltage for the power amplifier based on the sensing voltage, and applies the adaptive bias voltage to the power amplifier and to the replica circuit to improve the linearity of the power amplifier by regulating the power amplifier and the replica circuit according to the envelope.

PPA linearization

A calibration solution for a power amplifier array comprising a plurality of amplifier cells is presented that improves the linearity and efficiency of the power amplifier, especially when only a small number of the amplifier cells are active. To that end, a bias control word is selected from a predetermined bias table for each of the active power amplifier cells. An average of the selected bias control words is then used to bias an input stage of each active power amplifier cell. The solution presented herein provides techniques for determining the bias control words, as well as using the bias control words.

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Halikko, Finland

Ossi Toivonen