Small signal equivalent circuit

Discussion in 'Homework Help' started by mau80, May 25, 2011.

  1. mau80

    Thread Starter New Member

    Oct 24, 2010
    Hi to all,

    I've to solve some exercises related to amplifier based on BJR and MOS.
    In this exercise I've to construct small signal equivalent circuit.

    I'd like to ask some clarification about this task in details I’d like to ask:

    * if the attached result is correct

    * for PNP transistor is it correct to consider valid NPN small signal circuit, with opposite direction of emitter current.

    * if is it correct consider for nMOS and pMOs the same small signal schema

    I'd like to know if there is a workbook with exercises related to this topic, I’d like to find an exercises book with comment and useful trick for avoid common error.

    Thank you very much!

  2. jegues

    Well-Known Member

    Sep 13, 2010
    For the BJT portion everything looks fine, expect I'm fairly certain that the high-frequency small signal model for NPN and PNP should be the same without any changes in polarities or in the direction of the dependent current source. Thus, you would need to make changes to your small signal model of the PNP transistor.