PMOS is slower than NMOS

Discussion in 'General Electronics Chat' started by anhnha, Feb 13, 2016.

  1. anhnha

    Thread Starter Active Member

    Apr 19, 2012
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    It is said that PMOS is slower than NMOS. What does it mean with "slower"?
    Does it mean that PMOS has lower transition frequency (ft) than NMOS?
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
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    At the most fundamental level, it means that the majority carriers in PMOS (holes) are slower than those in NMOS (electrons).
     
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  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Slower in terms of how quickly it can go from a non-conducting state to a conducting state and back. This affects the risetime or fall time it can produce for pulse edges, the gain it has available to amplify high frequency signals, etc.

    ak
     
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  4. anhnha

    Thread Starter Active Member

    Apr 19, 2012
    773
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    Thanks for the answers! The root cause is electrons's mobility is about twice that of holes. However, I see in some lectures, the unity frequency is calculated for single NMOS and PMOS amplifier, ft (NMOS) is about twice ft (PMOS) and then they concluded that NMOS is faster and high speed than PMOS.
     
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