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  1. #1
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    How to get a TSMC 65nm 10M Ohm Resistor

    Can anyone who has experience with TSMC 65nm technique let me know that how I can create a 10,000,000 Ohm resistor?
    I went through the PDK and realized that those resistors are way smaller. (There is no way that I connect hundreds of resistors together to get the resistance I want since the area would explode.)

    I used 'presistor' for the sketchmatic of my circuit and later noticed that there is no layout for presistor.

    Can anyone please help me?

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  2. #2
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    Re: How to get a TSMC 65nm 10M Ohm Resistor

    presistor is for representing parasitics, their layout is what
    you made by hooking stuff up.

    You don't get to have all of the choices you'd like.

    My recommendation would be high resistivity (unsilicided,
    in-situ doped lightly) poly if this is an option in your
    specific flow-branch. Well resistors are fat and will have
    "side leakage" (junction leakage) and also a body effect
    that varies along the chain, as well as a well-substrate
    breakdown (may be a concern, depending on what you
    want those megohms for.

    For small signal and no great linearity concern, you might
    bias a small long channel FET to get the right answer.
    Probably a replica-bias scheme involving a smaller resistor
    and larger (finger count) FET, to set it up.

    Otherwise, 1K/sq poly and 10K squares, and like it. Despite
    fairly poor tolerances and tempco and grain size effects
    and noise attributes.



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