When the drive signal switches, the devices that were previously on have the B-E junctions reverse biased equally, with the voltage divided via the diodes. The only things normally used in high speed / high power circuits with darlingtons are relatively low value base-emitter resistors at each stage and reverse diodes across each base-emitter on each device. You can get better power efficiency using Sziklai pairs.
They are very different in operation and overall characteristics and should not be confused.Ī symmetric push pull with normal darlingtons gives a very reduced output swing and is inefficient power wise, due to the voltage drops across the power transistors when they are switched on. You are talking about a symmetric push-pull type circuit, Class B amp style.
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