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8 votes

Why is a push-pull transistor configuration asymmetric?

But that's not a valid push-pull circuit to begin with. You have the PNP transistor upside down. Even if it were correct, for negative output you would need a negative supply and you don't have one. ...
Justme's user avatar
  • 158k
6 votes

Why is a push-pull transistor configuration asymmetric?

Everyone has already pointed out that one of your transistors is arranged incorrectly. So I won't belabor it here. Sufficient that you know it won't work. The phrase ...
periblepsis's user avatar
4 votes
Accepted

How do I analyze an emitter follower with a capacitive load?

Since the transistor is only able to source current from the positive supply, implying current flowing downwards through the capacitor, and since you've provided no way for current to flow upwards ...
Simon Fitch's user avatar
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2 votes

Why does a MOSFET fail on fast signals, even if they're much longer than the turn on + turn off times?

While you may not have drawn a resistor in series with V2, the mosfet model most certainly contains one. See LTSPICE wiki: https://ltwiki.org/LTspiceHelp/LTspiceHelp/M_MOSFET.htm which in the table ...
rohmeooo's user avatar
  • 128
2 votes

Why is a push-pull transistor configuration asymmetric?

Each transistor is responsible for passing current in two different parts of the input/output waveform, between which current in the load changes direction. The upper transistor is allowing current to ...
Simon Fitch's user avatar
  • 38.3k
2 votes

How do I analyze an emitter follower with a capacitive load?

The problem is that you're trying to linearize about a DC bias where the transistor is deep into cutoff, because there's no way for C2 to discharge. The emitter voltage is pinned to Vcc, and you're ...
Hearth's user avatar
  • 35.1k
1 vote

Do you know this circuit?

The 2 PNPs form a simple comparator; comparing the emitter voltages. When the 3V3 level is higher than ext_3V3, the right-hand PNP will have a higher VBE than the left-hand one (since the bases are ...
jp314's user avatar
  • 19.4k

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