Telefonaktiebolaget Lm Ericsson (Publ)

St-Ericsson Sa

Acconeer Ab

Andreas Axholt

Christian Elgaard

Stefan Mikael Andersson

Imad Ud Din

Henrik Sjöland

Peter Almers

Rikard Nelander

Stefan Andersson

Erik Månsson

An integrated transformer arrangement for combining output signals of multiple differential power amplifiers to a single-ended load. The integrated transformer arrangement comprises a first transformer branch comprising an inductor loop. The inductor loop comprises a set of N windings connected in series. The first transformer branch further comprises a number of primary inductors. Each primary inductor comprises a winding placed concentrically to one winding of the inductor loop, and each primary inductor is configured to couple to a differential output of one of the multiple differential power amplifiers. The integrated transformer arrangement further comprises a secondary inductor comprising a winding placed concentrically to a winding of the inductor loop, and the secondary inductor is configured to couple to the single-ended load.

Integrated transformer

A power amplifier, for a transmitter circuit is disclosed, which comprises at least one field-effect transistor having a gate terminal and a bulk terminal. The at least one field-effect transistor is configured to receive an input voltage at the gate terminal and a dynamic bias voltage at the bulk terminal. The power amplifier comprises a bias-voltage generation circuit configured to generate the dynamic bias voltage as a nonlinear function of an envelope of input signal. The input voltage is a linear function of the input signal. The bias-voltage generation circuit comprises a rectifier circuit configured to generate a rectified input voltage and an amplifier circuit, operatively connected to the rectifier circuit, configured to generate the dynamic bias voltage based on the rectified input voltage. The amplifier circuit is a variable-gain amplifier circuit and the power amplifier comprises a control circuit configured to tune the gain of the amplifier circuit.

Power amplifier

A power amplifier () for a transmitter circuit () is disclosed. The power amplifier () comprises at least one field-effect transistor () having a gate terminal () and a bulk terminal (), wherein the at least one field-effect transistor () is configured to receive an input voltage at the gate terminal () and a dynamic bias voltage at the bulk terminal (). Furthermore, the power amplifier () comprises a bias-voltage generation circuit (). The input voltage is a linear function of an input signal. The bias-voltage generation circuit () is configured to generate the dynamic bias voltage as a nonlinear function of an envelope of the input signal.

Presented are methods and apparatuses for maintaining a substantially constant gain and reducing gain compression (AM-AM distortion) of a power amplifier based on a pre-distortion signal generated from an analog, baseband envelope feedback loop.

Power amplifier pre-distortion signal generator using an analog baseband envelope feedback loop

Disclosed herein is a passive, voltage mode transmitter assembly and method of operation. The passive, voltage mode transmitter assembly comprises a baseband filter configured to filter a source baseband signal, a harmonics filter, connected to the baseband filter, configured to remove harmonics from the filtered, source baseband signal, a passive, voltage mode mixer, connected to the harmonics filter, configured to up-convert an output of the harmonics filter to a radio signal, and a power amplifier, connected to the passive, voltage mode mixer, configured to amplify the radio signal.

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Lund, Sweden

Andreas Axholt