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Low RDSon Logic CMOS Gate

Discussion in 'Electronic Design' started by Klaus Kragelund, Oct 1, 2012.

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  1. Guest

    The lunch doesn't have to be free. If it's smaller, cheaper, and all
    wrapped up in a nicer box, that counts too.
     
  2. Guest

    I was experimenting using one as a VHF amplifier. That works well,
    until the smoke comes out. Another guy put a resistor in the supply
    line with some success.

    I switched to 'HC. Cool as a cucumber, and it just worked.
     
  3.  
  4. Jon Kirwan

    Jon Kirwan Guest

    Linear assumption, then:

    3.3V: I = 265uA + 1.02uA*f (in kHz)
    5.0V: I = 1210uA + 1.89uA*f (in kHz)

    Jon
     
  5. Fred Bartoli

    Fred Bartoli Guest

    Jon Kirwan a écrit :
    Which seems a lot...
    Also, the "static" (1210uA) current is way too big.

    1.89uA/kHz -> 1.89nC/switch event and a *big* 380pF Cpd under 5V

    380pF/4 gates, mean 95pF/gate which is 3 time the Fairchild figure...
     
  6. The static consumption is unmeaserable (or at least below 1uA)

    Regarding the high consumption, they are in parallel, so might be cross conduction from device to device if propagation times are no equal

    I'll dig further and post back here

    Cheers

    Klaus
     
  7. Guest

    Right. AC has a significant and intentional crossover current for speed.
    HC does not.
     
  8. Fred Bartoli

    Fred Bartoli Guest

    Klaus Kragelund a écrit :
    Of course the static current is that small. That's why I did put quotes.
    I meant the Jon_fitted_current_at_frequency_zero ...
    My thought too.
    If you have time, more than 2 frequency points will be interesting
    because of the big "F=0 current" ...
     
  9. Fred Bartoli

    Fred Bartoli Guest

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