MOS capacitor and double poly capacitor for PLL use

mpig09 · Oct 25, 2006

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

jeffsky520 · Oct 25, 2006

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

wdd · Oct 25, 2006

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.

MOS capacitor and double poly capacitor for PLL use

mpig09

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jeffsky520

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wdd

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MOS capacitor and double poly capacitor for PLL use

mpig09

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wdd

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