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  1. #1
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    MOS capacitor and double poly capacitor for PLL use

    Dear all :

    When I design a low pass filter for the pll, I can use MOS capacitor or double
    poly capacitor, which capacitor is better to use for pll design ?

    I only know MOS capacitor need have enough vgs(over vth) to keep the
    capacitor value, but I don't know NMOS capacitor and PMOS capacitor other limit
    conditions for use in circuit.

    Thanks for your help!!


    mpig

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  2. #2
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    MOS capacitor and double poly capacitor for PLL use

    Generally speaking MOS capacitor is used for less area than PIP cap.



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  3. #3
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    Re: MOS capacitor and double poly capacitor for PLL use

    There are many topics about PIP(MIM)cap vs. mos cap. you can search it in this forum.

    For PLL, I know you can use both of them to reduce die area, because they use different layers.



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