Lc oscillator with wide tuning range and low phase noise

Details Lc oscillator with wide tuning range and low phase noise Lc oscillator with wide tuning range and low phase noise

H - Electricity

03

L

H03L 7/08 (2006.01) H03B 5/08 (2006.01) H03B 5/12 (2006.01) H03B 1/00 (2006.01)

Patent

CA 2488631

A voltage-controlled oscillator (600) including an active oscillator circuit (610), an inductor, and capacitive circuits is disclosed. The capacitive circuits are selectively turned on and off to control the frequency of the voltage-controlled oscillator (600). Particularly, the inductor and the capacitors in the capacitive circuits form LC circuits that provide feedback to the active oscillator circuit (610). To avoid damage to the switches in the capacitive circuits, the capacitive circuits further comprise resistors (622). The resistors can be configured in several different ways so that the voltage- controlled oscillator (600) can have a high degree of reliability, and a wide tuning range with constant phase noise performance.

L'invention concerne un oscillateur commandé en tension (600) comprenant un circuit oscillateur actif (610), un inducteur, et des circuits capacitifs. Lesdits circuits capacitifs sont sélectivement mis sous tension et hors tension afin que soit commandée la fréquence de l'oscillateur commandé en tension (600). En particulier, l'inducteur et les condensateurs situés dans les circuits capacitifs forment des circuits inductifs/capacitifs qui fournissent une rétroaction au circuit oscillateur actif (610). Pour éviter que les commutateurs soient endommagés dans les circuits capacitifs, ces derniers comprennent des résistances (622). Celles-ci peuvent être configurées de plusieurs manières différentes de sorte que ledit oscillateur commandé en tension (600) présente un degré élevé de fiabilité, et une large bande de fréquence d'accords avec une performance de bruit de phase constante.

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