An amplifier circuit includes: first and second nodes configured to receive input of differential signals; third and fourth nodes; a plurality of first inductors configured to be connected in series between the first and second nodes; a plurality of second inductors configured to be connected in series between the third and fourth nodes; a plurality of field effect transistors configured to have gates each configured to be connected between the plurality of first inductors, sources each configured to be connected to a reference potential node, and drains each configured to be connected between the plurality of second inductors; and a synthesizing unit configured to synthesize signals at the third and fourth nodes.

An envelope tracking power amplifier uses signal cancellation techniques to provide isolation between RF signals and envelope signals, without the use of filters. In this manner, the envelope tracking power amplifier is capable of operating with envelope signals that are at or near the frequency of the corresponding RF signals. In at least one embodiment, a double balanced power amplifier is provided that includes a balanced RF input port (20), a balanced RF output port (22), and a balanced envelope input port (32). The balanced nature of the amplifier results in ports of the amplifier forming virtual grounds with respect to signals at other ports. In some other embodiments, a single balanced amplifier is provided that provides isolation between ports thereof.

Anamplifier device includes an initial amplifier stage configured to receive a differential input signal at a first leg and a second leg; a final amplifier stage coupled to outputs of the initial amplifier stage, the final amplifier stage including a primary signal amplifier and an error amplifier in each of the first and second legs; and wherein an output of the error amplifier of the first leg is combined with an output of the primary signal amplifier in the second leg, and an output of the error amplifier of the second leg is combined with an output of the primary signal amplifier in the first leg.

A low noise amplifier comprises at least one amplifying transistor (Ts1; Ts2) configured in a common source configuration to receive an input signal (RFin) at a gate terminal and provide an amplified signal at a drain terminal and at least one feedback path arranged to couple a part of the amplified signal back to the gate terminal and comprising a feedback impedance. The low noise amplifier further comprises a self-coupled step-up transformer having at least one primary winding (Lp) connected to a supply voltage (Vdd) and the drain terminal of the at least one amplifying transistor and at least one self-coupled secondary inductor winding (Lf1; Lf2) arranged in the feedback path. The low noise amplifier provides a better suppression for out-band interference and at the same time it has a wider input match bandwidth, decent conversion gain and decent noise figure without increasing power consumption.

La présente invention concerne la réalisation d'un baluns actif large bande

Le balun actif, large bande, selon l'invention comporte deux structures amplificatrices distribuées, chaque structure étant constituée de cellules élémentaires formant un montage série-parallèle comportant quatre inductances mises en série deux à deux et un premier élément actif (47, 410) amplificateur, mis en parallèle sur les inductances. Chaque cellule comporte également un deuxième élément actif (52, 54, 72, 74) associé au premier (47, 410) pour former un étage d'adaptation d'impédance.

Selon l'invention, les deux éléments actifs peuvent consister en des montages à transistors à effet de champ ou en des montages à transistors bipolaires.

L'invention s'applique notamment à la réalisation de circuits mélangeurs hyperfréquence en technologie MMIC.

A power amplifier that reduces intermodulation distortion generated by the amplifier while reducing the number of parts is provided. A power amplifier comprises a first balun, to which a combined signal combining two signals of different frequencies is inputted, and which outputs, based on the combined signal, the first and the second signal whose phase are opposite; a first amplifier that outputs the first amplified signal containing the differential frequency component comprising the difference of the frequencies of two signals from the first signal; a second amplifier that outputs the second amplified signal containing the component comprising the difference of the frequencies of two signals from the second signal; and a second balun that outputs the combined signal of the first and the second amplified signals. The component contained in the first and the second amplified signal are inputted via the second and the first amplifier, respectively, to reduce the component.

First and second inductors (2,3) are formed in an identical plane of a substrate (10) as thin films each having a spiral shape, and are concentrically arranged and electromagnetically coupled. The collector of an amplifying transistor (1) and a collector voltage terminal (6) are connected to the two ends of the first inductor (2), respectively. An unbalanced oscillation signal is input to the base of the amplifying transistor (1). An oscillation signal output from the collector of the amplifying transistor (1) is transmitted to the first inductor (2), and is tuned and coupled by the second inductor (3). Consequently, a balanced pair of oscillation signals are output from output terminals at the two ends of the second inductor (3).

A power amplifier that reduces intermodulation distortion generated by the amplifier while reducing the number of parts is provided. A power amplifier comprises a first balun, to which a combined signal combining two signals of different frequencies is inputted, and which outputs, based on the combined signal, the first and the second signal whose phase are opposite; a first amplifier that outputs the first amplified signal containing the differential frequency component comprising the difference of the frequencies of two signals from the first signal; a second amplifier that outputs the second amplified signal containing the component comprising the difference of the frequencies of two signals from the second signal; and a second balun that outputs the combined signal of the first and the second amplified signals. The component contained in the first and the second amplified signal are inputted via the second and the first amplifier, respectively, to reduce the component.