H - Electricity – 03 – H
Patent
H - Electricity
03
H
H03H 11/28 (2006.01) H03H 7/38 (2006.01)
Patent
CA 2239343
A matching circuit is formed by a series inductor, a parallel capacitor, a drain bias circuit, and a DC-blocking capacitor for the purpose of impedance matching. A capacitor having a capacitance that is dependent upon the bias voltage is used as the parallel capacitor. This can be, for example, a material such as a (BaxSr1x)TiO3 thin-film, which exhibits a capacitance having a bias voltage dependency. Because this thin-film capacitor exhibits polarization by an electrical field, its capacitance is the largest with a bias of O volts, and is reduced to approximately 50% as the bias voltage is increased. By using this capacitor in a matching circuit, it is possible to change the matching condition as the output power is increased, that is, as the voltage applied to the capacitor is increased. By considering both the condition which results in good transistor output and the condition which results in good distortion characteristics, it is possible to achieve a design in which the matching conditions are changed from a condition that emphasizes output power to a condition that emphasized low distortion, as the output power increases.
L'invention est un circuit d'adaptation d'impédance qui est constitué d'un inductance série, d'un condensateur parallèle, d'un circuit de polarisation de drain et d'un circuit de blocage du courant continu. Un condensateur dont la capacité dépend de la tension de polarisation est utilisé comme condensateur parallèle. Ce condensateur peut, par exemple, être constitué de couches minces de (BaxSr1x)TiO3, ce matériau ayant une capacité qui dépend de la tension de polarisation. Étant donné qu'un champ électrique engendre des charges de polarisation dans ce type de condensateur en couches minces, la capacité de celui-ci est maximale quand la tension de polarisation est nulle et elle tombe approximativement à 50% de sa valeur quand la tension de polarisation augmente. En utilisant ce type de condensateur dans un circuit d'adaptation, on peut modifier la condition d'adaptation quand la puissance de sortie augmente, c'est-à-dire quand la tension appliquée au condensateur augmente. En tenant compte des conditions qui maximisent la puissance de sortie du transistor et de celles qui minimisent la distorsion, on peut obtenir un circuit dans lequel, quand la puissance de sortie augmente, les conditions d'adaptation évoluent d'une situation de maximisation de la puissance de sortie vers une situation de minimisation de la distorsion.
Iwata Naotaka
Yamaguchi Keiko
Corporation Nec
G. Ronald Bell & Associates
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