Capacitor within NWELL good or surround with NWELL good? ( double poly)

Discussion in 'Cadence' started by boki, Apr 23, 2004.

  1. boki

    boki Guest

    Dear All,


    Could you please tell me layout capacitor within NWELL good or
    surround with NWELL good? ( double poly)


    Best regards,

    Boki.
     
    boki, Apr 23, 2004
    #1
  2. boki

    G Vandevalk Guest

    You could connect the NWELL to a quiet supply. (AGND !?)

    OR you could let it float and get some extra isolation from a noisy chip
    substrate.

    The concept of letting it float will mess up some verification systems
    and simulators
    so it is a bad idea in practice. (but may acually work!)

    The concept of placing it inside an area surrounded by an NWELL do-nut shape
    is simply to physically separate it from the (supposedly noisy )
    substrate to some degree.

    The concepts that are understood about substrate noise are modeled
    weakly in this area.

    YMMV

    - Gerry
     
    G Vandevalk, Apr 23, 2004
    #2
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