公开(公告)号：US20030227341A1

公开(公告)日：2003-12-11

申请号：US10453507

申请日：2003-06-04

Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

Inventor： Akihiro Sawada

IPC: H03B001/00

CPC classification number: H03B5/1228 ,  H03B5/1215 ,  H03B5/1253 ,  H03B5/1265 ,  H03B2201/025

Abstract: In a voltage-controlled oscillator, a second variable capacitor circuit is provided in a variable capacitor circuit group, in addition to a first variable capacitor circuit having a first variable capacitor whose capacitance varies continuously in accordance with a frequency control signal. The second variable capacitor circuit has several second variable capacitors whose capacitances vary continuously in accordance with the frequency control signal and switching circuits that select the second variable capacitors in accordance with frequency band control signals. The oscillation frequency is changed only with the first variable capacitor in higher oscillation frequency bands. When the oscillation frequency is in lower oscillation frequency bands, the oscillation frequency band is changed also with the second variable capacitors. Accordingly, it is possible to ensure broad oscillation frequency bands, while reducing variations in the VCO gain in the entire oscillation frequency bands to a low level.

Abstract translation: 在压控振荡器中，除了具有第一可变电容器的第一可变电容器电路之外，在可变电容器电路组中设置第二可变电容器电路，该可变电容器电容器的电容根据频率控制信号连续变化。 第二可变电容器电路具有几个第二可变电容器，其电容根据频率控制信号连续变化，并且根据频带控制信号选择第二可变电容器的开关电路。 在较高的振荡频带中，振荡频率仅由第一可变电容器改变。 当振荡频率处于较低的振荡频带时，振荡频带也随第二个可变电容变化。 因此，可以确保宽的振荡频带，同时将整个振荡频带的VCO增益的变化降低到低电平。