logic circut bu BJT

Discussion in 'Homework Help' started by eng.mustafasalah, Mar 3, 2013.

  1. eng.mustafasalah

    Thread Starter Member

    Nov 10, 2011
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    2
    http://im34.gulfup.com/CzXfF.jpg

    q4 - in the circuit shown what is the minimum RL that the invert can drive with out causing the output drop blew 4 V when Vi = 0V ?

    i don't understand what he want in Q4

    how i solve question 4 ?
     
    Last edited: Mar 3, 2013
  2. Brownout

    Well-Known Member

    Jan 10, 2012
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    I don't understand it either. In fact, I can't even read it.
     
  3. eng.mustafasalah

    Thread Starter Member

    Nov 10, 2011
    41
    2
    i write the q4 ...
    q4 - in the circuit shown what is the minimum RL that the invert can drive with out causing the output drop blew 4 V when Vi = 0V ?
     
  4. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    OH, he wants you to provide the minumum resistance for RL which the inverter can drive without causing the output to drop below 4V when Vi=0. Vi is the input voltage to the inverter.
     
  5. eng.mustafasalah

    Thread Starter Member

    Nov 10, 2011
    41
    2
    ok
    how i prove that ? do you know ?
     
  6. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    Well, when the input voltage = 0V, is the transistor on or off? If it's on, then you need to derive an expression for output voltage with the transistor on. If it's off, then you need to derive an expression for the output voltage with the transistor off.
     
  7. eng.mustafasalah

    Thread Starter Member

    Nov 10, 2011
    41
    2
    thank uuuuuuuuuuuuuuuuuuuuuuuuuu
     
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