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To CMOS or Not

Discussion in 'Electronic Design' started by West, Oct 8, 2007.

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  1. West

    West Guest

    I know the main advantages of using CMOS ICs are to reduce power supply
    requirements and to provide a higher noise immunity.
    What I don't know is when CMOS ICs are not called for. What are the
    advantages of non-CMOS chips? Thank you.

  2. Jim Thompson

    Jim Thompson Guest

    Bipolar: Low noise amplification, high bandwidth, low offsets,

    But the best of both worlds is BiCMOS.

    ...Jim Thompson
  3. John Larkin

    John Larkin Guest

    Bipolar ECL, or better yet SiGe, when you want to go faster. See the
    OnSemi Eclips Lite and GigaComm parts, or the Analog Devices
    comparators. 40 ps edges! TI has a 5 GHz opamp, maybe SiGe.

    InGaAs when you want to go really fast. Hittite and W-J and such.

    Bipolar for high voltage swings, too, like voltage regulators.

  4. Tim Williams

    Tim Williams Guest

    Er, second breakdown? MOSFETs..!?

  5. John Larkin

    John Larkin Guest

    There aren't a lot of high-voltage cmos processes. Supertex has some
    display drivers. AT&T used to have a 350 volt linear cmos process
    (Apex used it) but I think it's gone.

    There are those IR high-side mosfet drivers; I'm not sure how they
    work inside.

  6. JosephKK

    JosephKK Guest

    John Larkin posted to
    There are also some special functions like log amps, and multipliers
    that may not have a reasonable CMOS substitute.
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