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    • 4. 发明申请
    • Tunable resonator for use in active-RC continuous-time filters
    • 可调谐谐振器用于主动RC连续时间滤波器
    • US20070046366A1
    • 2007-03-01
    • US11203579
    • 2005-08-10
    • Jeffrey HinrichsWilliam Goyette
    • Jeffrey HinrichsWilliam Goyette
    • H03K5/00
    • H03H11/1291H03H11/1252
    • An integrated circuit (IC) resonator in which resonator parameters potentially affected by IC fabrication processes are correctable after fabrication. Resonance frequency tuning is effected by forming each feedback capacitor in a pair of integrator circuits to include a variable capacitance device, such as a varactor diode. A tuning signal is applied to the varactor diode to adjust the total capacitance value and, therefore, the resonance frequency. Similarly, the quality (Q) factor of the resonator is adjusted by providing a variable capacitance in an RC (resistance-capacitance) network coupling the output of one of the integrator circuits to the input of the other. The variable capacitance in the RC network permits adjustment of phase in the event that the integrator circuits do not provide a desired 180° total phase shift.
    • 一种集成电路(IC)谐振器,其中可能受IC制造工艺影响的谐振器参数在制造之后是可校正的。 谐振频率调谐通过在一对积分器电路中形成每个反馈电容器来实现,以包括可变电容器件,例如变容二极管。 调谐信号被施加到变容二极管以调整总电容值,因此调谐谐振频率。 类似地,通过在将一个积分器电路的输出耦合到另一个的输入的RC(电阻 - 电容)网络中提供可变电容来调节谐振器的质量(Q)因子。 在积分器电路不提供所需的180°总相移的情况下,RC网络中的可变电容允许调整相位。