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    參數(shù)資料
    型號: DSP1627
    英文描述: TVS 400W 6.5V BIDIRECT SMA
    中文描述: DSP1627數(shù)字信號處理器
    文件頁數(shù): 148/154頁
    文件大?。?/td> 2365K
    代理商: DSP1627
    Data Sheet
    March 2000
    DSP1627 Digital Signal Processor
    148
    Lucent Technologies Inc.
    13 Crystal Electrical Characteristics and Requirements
    (continued)
    At the third overtone frequency, f
    3
    , it is desirable to have the net impedance of the trap circuit (X
    T
    ) equal to the im-
    pedance of C
    2
    (X
    C2
    ), i.e.,
    Selecting C
    3
    so that X
    C3
    << X
    L1
    yields,
    For a capacitor,
    For an inductor,
    Solving for C
    1
    , and realizing that L
    1
    C
    1
    = 3/
    ω
    32
    yields,
    Hence, for C
    2
    = 10 pF, C
    1
    = 15 pF. Since the impedance of the trap circuit in this example would be equal to the
    impedance of a 10 pF capacitor, the negative resistance and supply current curves for C
    1
    = C
    2
    = 10 pF at 40 MHz
    would apply to this example.
    Finally, solving for the inductor value,
    For the above example, L
    1
    is 3.2
    μ
    H.
    X
    T
    X
    C2
    X
    C1
    X
    C3
    X
    L1
    +
    (
    )
    ||
    =
    =
    X
    T
    X
    C2
    X
    C1
    X
    L1
    ||
    =
    =
    X
    C
    j
    C
    -------- where
    ω
    2
    π
    f
    =
    =
    X
    L
    j
    ω
    L
    =
    C
    1
    3
    2C
    2
    =
    L
    1
    4
    π
    2
    f
    T2
    C
    1
    ------------1
    =
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