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cmos introduction

Discussion in 'Electronic Repair' started by RJ, Feb 25, 2006.

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  1. RJ

    RJ Guest

    Can anybody tell me when did cmos move into consumer electronics from
    the military? Thanks
     
  2. JANA

    JANA Guest

    I think I remember seeing CMOS transistors in consumer electronics going
    back to the late 60's or early 70's. These were also referred to as FET
    (Field Effect Transistor).

    As for CMOS imaging, I don't think I have seen it until about the mid 80's.

    The first CMOS devices were very expensive when they first came out.

    --

    JANA
    _____


    Can anybody tell me when did cmos move into consumer electronics from
    the military? Thanks
     
  3. I don't think you saw any CMOS "transistors" at all. CMOS stands for
    "Complimentary Metal Oxide Semiconductor"; in other words, it uses
    devices in pairs, one for pull up, one for pull down. Some early FETs
    were called "IGFET" for "Insulated Gate Field Effect Transistor"; that
    could be somewhat equivalent to one part of a CMOS structure.

    The huge advantage of CMOS is that one device or the other is always
    off, so practically no current flows fron Vcc to Ground except during
    the time a gate is switching. Since the input of the following stage
    uses insulated gates also, it takes virtually no current to keep it in
    whatever state is desired.

    RCA introduced CMOS gates somewhere around 1966 or '67, under the trade
    name "COSMOS'. For some time after that, the devices were blindingly
    slow.

    Isaac
     
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