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    • 74. 发明授权
    • Narrow band pass filter
    • 窄带通滤波器
    • US07652526B2
    • 2010-01-26
    • US11499961
    • 2006-08-07
    • Kenneth Brakeley Welles, IIWolfgang Daum
    • Kenneth Brakeley Welles, IIWolfgang Daum
    • H03K17/16H03H11/02
    • H04Q9/00H04Q2209/30H04Q2209/60H04Q2209/823
    • A switched capacitor narrow band pass filter includes a first switch including a first pole movable between two first switch terminals, a second switch including a second pole moveable between second switch terminals, and a third switch including additional poles movable between third switch terminals. The filter further includes an effective capacitor coupled to the first pole and a plurality of matchinq capacitors coupled respectively to the second and third switch terminals. The additional poles are coupled to the third switch terminals according to a first predetermined sequence and to the third switch terminals at a predetermined frequency. A differential amplifier assembly includes two positive and two negative terminals coupled to the additional poles in a second predetermined sequence wherein two of the additional poles are coupled to the positive terminals and two others of the additional poles are coupled to the negative terminals for signal summation.
    • 开关电容器窄带通滤波器包括:第一开关,其包括可在两个第一开关端子之间移动的第一极;第二开关,包括可在第二开关端子之间移动的第二极;以及第三开关,其包括可在第三开关端子之间移动的附加极。 滤波器还包括耦合到第一极的有效电容器和分别耦合到第二和第三开关端子的多个匹配电容器。 附加极根据第一预定顺序耦合到第三开关端子,并以预定频率耦合到第三开关端子。 差分放大器组件包括以第二预定顺序耦合到附加极的两个正极和两个负极端子,其中两个附加极耦合到正极端子,另外两个额外的极点耦合到负极端子用于信号求和。