Waste energy control management for power amplifier

H - Electricity – 03 – F

Patent

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H03F 3/20 (2006.01) H03F 1/00 (2006.01) H03F 1/02 (2006.01) H03F 1/32 (2006.01) H03F 3/60 (2006.01) H04B 1/04 (2006.01) H04B 1/40 (2006.01) H04B 1/52 (2006.01) H04B 7/24 (2006.01)

Patent

CA 2157183

An amplifying apparatus for linearly amplifying a desired signal using a pair of coupled non-linear amplifiers (57) is disclosed. The amplifying apparatus comprises a limiter (21) for separating amplitude variations from the desired signal and producing a constant amplitude signal bearing the phase of the desired signal and an amplitude related signal. In addition, a drive signal generator (62) produces two drive signals each dependent on the constant amplitude signal and the amplitude related signal such that each drive signal depends on the phase of the desired signal and such that the sum of the squares of the amplitudes of the drive signals is constant. Finally, a coupler (56) couples the two drive signals to produce two constant amplitude signals for driving the pair of non-linear power amplifiers (57) and for coupling the outputs of the power amplifiers (57) to produce two amplified output signals, one of which is the linearly amplified desired signal and the other of which is a waste energy signal.

Appareil amplificateur servant à amplifier de manière linéaire un signal désiré à l'aide d'une paire d'amplificateurs non linéaires couplés (57). Cet appareil amplificateur comprend un limiteur (21) qui sépare les variations d'amplitude du signal désiré et produit un signal à amplitude constante portant la phase du signal désiré et un signal lié à l'amplitude. En outre, un générateur (62) de signaux d'attaque produit deux signaux d'attaque qui dépendent chacun du signal à amplitude constante et du signal lié à l'amplitude de sorte que chaque signal d'attaque dépende de la phase du signal désiré et que la somme des carrés des amplitudes des signaux d'attaque soit constante. Un coupleur (56) couple les deux signaux d'attaque pour produire deux signaux à amplitude constante pour commander les deux amplificateurs de puissance non linéaires (57) et pour coupler les sorties des amplificateurs de puissance (57) afin de produire deux signaux de sortie amplifiés représentant respectivement le signal désiré linéairement amplifié et le signal d'énergie perdue.

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