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    • 10. 发明申请
    • THE DIFFERENTIAL VCO AND QUADRATURE VCO USING CENTER-TAPPED CROSS-COUPLING OF TRANSFORMER
    • 使用变压器的中心十字交叉耦合的差分压控振荡器和压控振荡器
    • WO2009104839A1
    • 2009-08-27
    • PCT/KR2008/003331
    • 2008-06-13
    • ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTELEE, Young JaeKIM, Cheon Soo
    • LEE, Young JaeKIM, Cheon Soo
    • H03B5/12
    • H03B5/1228H03B5/1212H03B5/124H03B5/1293H03B5/1296
    • Provided are a differential voltage-controlled oscillator (VCO) and a quadrature VCO using center-tapped cross-coupling of a transformer. The differential VCO and the quadrature VCO can be driven by low power through a current reuse structure and have an excellent phase noise characteristic by center-tapped cross-coupling through a transformer. Further, variable capacitance units for frequency variation are divided into variable capacitance units for coarse tuning and variable capacitance units for fine tuning. Therefore, it is possible to obtain a wide tuning range while voltage oscillation gain is reduced. Further, the differential VCO and the quadrature VCO are configured in such a manner that the respective variable capacitance units operate linearly throughout the entire capacitance region due to control voltage distribution by resistors. Accordingly, it is possible to obtain a linear control voltage-oscillation frequency characteristic. The quadrature VCO according to the present invention can output four-phase quadrature signals while having an excellent phase noise characteristic, without substrate loss and current consumption caused by the switching transistors.
    • 提供了一种差分压控振荡器(VCO)和使用变压器的中心抽头交叉耦合的正交VCO。 差分VCO和正交VCO可以通过电流重用结构的低功率驱动,并且通过通过变压器的中心抽头交叉耦合具有优异的相位噪声特性。 此外,用于频率变化的可变电容单元被分为用于粗调的可变电容单元和用于微调的可变电容单元。 因此,可以获得宽的调谐范围,同时降低电压振荡增益。 此外,差分VCO和正交VCO被配置为使得各个可变电容单元由于由电阻器的控制电压分布而在整个电容区域中线性地工作。 因此,可以获得线性控制电压 - 振荡频率特性。 根据本发明的正交VCO可以输出四相正交信号,同时具有优异的相位噪声特性,而没有由开关晶体管引起的衬底损耗和电流消耗。