Gyrator with loop amplifiers connected to inductive elements

Details Gyrator with loop amplifiers connected to inductive elements Gyrator with loop amplifiers connected to inductive elements

H - Electricity

03

H

H03H 11/50 (2006.01) H03B 5/20 (2006.01)

Patent

CA 2289501

A gyrator includes shunt or feedback nodal capacitors and shunt lossy inductors without shunt load resistors. The effective nodal capacitance is reduced by the introduction of the shunt lossy inductors. The inductors act to discriminate against injected power supply noise, resulting in improved oscillator phase noise. The inductors produce less dc voltage drop than the resistive load, so that larger linear oscillation is obtained with improved oscillator phase noise. The gyrator includes an automatic gain control circuit and a tuning control circuit which are separate from each other and fast and slow acting control loops which are augmented with each other.

Cette invention se rapporte à un gyrateur, qui comprend des condensateurs nodaux de dérivation ou de rétroaction et des inducteurs à perte de dérivation, sans résistances de charge de dérivation. La capacitance nodale effective est réduite grâce à l'introduction des inducteurs à perte de dérivation. Ces inducteurs ont pour effet de discriminer le bruit de la source d'alimentation injecté, ce qui entraîne un meilleur bruit de phase de l'oscillateur. Ces inducteurs produisent une chute de tension cc plus petite que la charge résistive, de telle sorte qu'une oscillation linéaire plus grande est obtenue avec un meilleur bruit de phase de l'oscillateur. Ce gyrateur comporte un circuit de commande de gain automatique (AGC) et un circuit de commande de syntonisation qui sont séparés l'un de l'autre, ainsi que des boucles de commande à action rapide et lente qui se complètent l'une l'autre.

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