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    • 7. 发明公开
    • FILTER DEVICE AND CONTROL METHOD THEREFOR
    • FILTERVORRICHTUNG UND STEUERUNGSVERFAHRENDAFÜR
    • EP2485397A1
    • 2012-08-08
    • EP11752454.6
    • 2011-03-30
    • Asahi Kasei Microdevices Corporation
    • KAMADA, Mikio
    • H03H11/12H03H11/04
    • H03G3/3052H03H11/0472H03H2210/012H03J3/20H03J2200/15
    • There is provided a filter device having a function of adjusting the center frequency of a filter. The filter device includes: a filter core unit (102) provided with an adder (109) for outputting an added signal of an input signal and a feedback signal (signal Vf), an AGC circuit for generating an amplification signal in which the added signal is amplified, and a phase shifter (111) for generating the signal Vf by shifting a phase of the amplification signal; an amplitude comparing circuit (101) for comparing the reference amplitude and the amplitude of the signal Vf; a gain control voltage generator (108) for controlling the amplification factor of the AGC circuit (110) based upon the comparison result; a frequency comparing circuit (103) for comparing the reference frequency and the frequency of the signal Vf; a phase shifter control voltage generator (117) for controlling the shift amount of the phase in the phase shifter (111) based upon the comparison result. The gain control voltage generator (108) oscillates the filter core unit (102), while the amplification factor and the shift amount are being controlled.
    • 提供了具有调节过滤器的中心频率的功能的过滤装置。 滤波器装置包括:滤波器芯单元(102),设置有用于输出输入信号和反馈信号(信号Vf)的相加信号的加法器(109),用于产生放大信号的AGC电路,其中相加信号 以及用于通过移位放大信号的相位来产生信号Vf的移相器(111); 振幅比较电路(101),用于比较参考振幅和信号Vf的振幅; 用于根据比较结果控制AGC电路(110)的放大系数的增益控制电压发生器(108) 频率比较电路(103),用于比较参考频率和信号Vf的频率; 基于比较结果控制移相器(111)中的相位偏移量的移相器控制电压发生器(117)。 增益控制电压发生器(108)在控制放大系数和偏移量的同时振荡滤波器核心单元(102)。