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Question about transistor names ?

Discussion in 'Electronic Basics' started by Abbie, Nov 21, 2003.

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  1. Abbie

    Abbie Guest

    Is bipolar and ttl the same thing,
    is mosfet, cmos, mos, fet the same thing ?
  2. Chris Welsh

    Chris Welsh Guest

    Bipolar usually refers to a type of transistor , such as Bipolar Junction
    Transistor (BJT)

    TTL refers to Transistor-Transistor Logic, and describes how how the
    transistors are connected in order to make logic devices.....

    a FET is a Field Effect Transistor, a different type from a BJT, and MOSFET
    (Metal Oxide Semiconductor) is a subclass of FETS. CMOS is kinda like TTL,
    it describes how MOSFETS are put together in order to make logic devices
    (CMOS : Complementary MOSFET)

  3. Not really.

    TTL means transistor-transistor-logic, the sort of IC design where the
    reception of the input signal, the logic and the output drive are all
    handled by bipolar transistors.

    FET means field-effect-transistor.

    MOSFET means metal-oxide-semiconductor FET (just a sort of FETs).

    MOS is an abbreviation for the MOSFET transistor technology.

    CMOS means complementary MOS(-FET IC design) (where both n-channel and
    p-channel MOS FETs are used in one chip so that one acts as pull-up, the
    other as pull-down in output drive/amp stages)

    Note to the more experienced: please correct my mistakes.

  4. David Wood

    David Wood Guest

    Is bipolar and ttl the same thing,

    No, or they wouldn't have different names. Bipolar refers to a
    particular common type of transistor (junction) and ttl is an
    abbreviation for transistor-transistor logic, a method of using
    transistors in circuitry.
    Same answer as above on the general question. Specifically, metal
    oxide semiconductor field effect transistor (mosfet), complimentary
    metal oxide semiconductor (cmos), metal oxide semiconductor (mos) and
    field effect transistor (fet), but judging from your general ignorance
    (not a bad thing, we all start that way) I doubt the long names help
    much. For more explanation try a google search on "electronic
    dictionary" or similar. Here's one hit I found:
  5. Abbie

    Abbie Guest

    I learnt it a long time ago but I have forgotten. It seems I was
    partially right as mosfet, mos, and fet are the same.
    cmos is just a bunch of mos's and ttl is just a bunch of bipolars.
  6. Bipolar means you have 2 current carriers.
  7. -------------
    The orignal plain, S, and 74-series LS TTL logic family was bipolar,
    because bipolar means bipolar transistors, which are ONLY the NPN
    and PNP type, with an emitter, base, and collector.

    FETs are field-effect transistors, MOSFETs are the common type, and
    CMOS is the logic family made with MOSFETS. MOSFETs have a source,
    gate, and drain that correspond to some degree to the bipolar EBC,
    but function a bit differently, operating by gate voltage rather
    than base current to regulate a major current in the collector-emitter
    path or drain-source path. The two types, enhancement and depeletion
    mode, correspond roughly to NPN and PNP.

  8. Wim Lewis

    Wim Lewis Guest

    No, there are other kinds of FET besides MOSFETs. JFETs (junction FETs)
    are pretty common. There are probably also a bunch of specialized
    CMOS means circuitry built using *complementary pairs* of MOSFETS. Non-
    complementary MOSFET logic (PMOS and NMOS) used to be pretty common.

    TTL originally meant logic built using bipolar transistors, but now
    it's often used to describe voltage levels compatible with the original
    TTL specs (even if the circuit isn't actually TTL any more).
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