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    • 46. 发明公开
    • Overlapping, two-segment capacitor bank for VCO frequency tuning
    • ÜberlappendeZweisegment-KondensatorbankfürVCO-Frequenzabstimmung
    • EP2506424A2
    • 2012-10-03
    • EP12004810.3
    • 2010-05-07
    • Qualcomm, Inc.
    • Zeng, YiPan, Tzu-WangLin, I-Hsiang
    • H03B5/12
    • H03B5/1228H03B5/1212H03B5/1253H03B5/1265H03B5/1293
    • A VCO (for example, in an FM receiver) includes an LC resonant tank. The LC resonant tank includes a coarse tuning capacitor bank and a fine tuning capacitor bank. The coarse tuning capacitor bank contains a plurality of digitally controlled coarse tuning capacitor elements, each providing a first capacitance value when active. The fine tuning capacitor bank contains a plurality of digitally controlled fine tuning capacitor elements, each providing a second capacitance value when active. To address the practical problem of capacitor mismatch, capacitance overlap throughout the VCO tuning range is created by selecting the first and second capacitance values such that the capacitance value of the fine capacitor bank is greater than the first capacitance value when all of the digitally controlled fine tuning capacitor elements of the fine capacitor bank are active.
    • VCO(例如,在FM接收机中)包括LC谐振槽。 LC谐振槽包括粗调谐电容器组和微调电容器组。 粗调谐电容器组包含多个数字控制的粗调电容器元件,每个主要电容元件在有效时提供第一电容值。 微调电容器组包含多个数字控制的微调电容器元件,每个微调电容器元件在有源时提供第二电容值。 为了解决电容器失配的实际问题,通过选择第一和第二电容值来创建整个VCO调谐范围内的电容重叠,使得当全部数字控制的精细时,精细电容器组的电容值大于第一电容值 微调电容器组的调谐电容元件有效。