公开(公告)号：US20040124930A1

公开(公告)日：2004-07-01

申请号：US10672920

申请日：2003-09-26

Applicant: STMICROELECTRONICS S.A.

Inventor： Thierry Divel ,  Julien Mira

IPC: H03L007/00

CPC classification number: H03B5/1206 ,  H03B5/1243

Abstract: The invention relates to a voltage controlled oscillator comprising a resonator having an inductive circuit and a capacitive circuit whose oscillations are maintained by an active circuit, the capacitive circuit using varactors whose capacitance is adjusted by a control voltage acting in a differential mode with a biasing voltage. According to the invention, the capacitive circuit comprises several capacitive branches connected in parallel, controlled by a same control voltage, but biased by biasing voltages that are different from one branch to the next. The oscillator of the invention features in particular an oscillation frequency, which is much easier to control, and a considerably reduced phase noise.

Abstract translation: 本发明涉及一种压控振荡器，其包括具有感应电路的谐振器和其振荡由有源电路维持的电容电路，所述电容电路使用可变电抗器，其电容通过以偏置电压作用在差分模式的控制电压来调节 。 根据本发明，电容电路包括并联连接的几个电容分支，由相同的控制电压控制，但是通过不同于一个分支到下一个分支的偏置电压来偏置。 本发明的振荡器特别地具有更容易控制的振荡频率和显着降低的相位噪声。