Contents
What is leakage current of transistor?
The current in the blocking direction in a diode is called the leakage current. There are no leakage currents in the transistor with its two diodes if one electrode is open at a time. The amounts of these leakage currents depend only a little upon the value of the voltage applied (saturation).
How does a Sziklai pair differ from a Darlington pair?
The Sziklai Pair uses transistors of complementary polarity to achieve the same gain as the Darlington Pair, but with improved VBE characteristics. Only Q1’s base-emitter junction is exposed to the outside world. However, the Sziklai pair does not suffer as badly as the Darlington in terms of VBE.
When do you use the Sziklai transistor pair?
The sziklai pair are commonly used at the output stages of push-pull and class AB audio amplifier. As you can see in the above image, Sziklai pair have two configuration. The first is NPN type sziklai pair, in which the transistor Q1 is NPN and Q2 is PNP.
How does the leakage occur in a germanium transistor?
2) the leakage is Hfe time the Collector to base current. The leakage is through this junction. If the base is returned to the emitter,then the current is a minimum. If a resistor is placed between the base and the emitter, then this current causes a Vbe volt drop and will try to turn the transistor ON so the Ic increases.
How does the leakage of a transistor affect the resistor?
A transistor leaks current from its collector to its base. Then the transistor amplifies this leakage current which makes it much worse. A resistor from base to emitter conducts the leakage current away from the base so the transistor cannot amplify it.
How is a Sziklai pair different from a Darlington pair?
The main difference is that in sziklai pair Q2 base current is given by the collector of Q1 instead of the emitter current. The benefit of a Sziklai pair is that it uses less current to turn on than the Darlington pair as in this pair one potential barrier has to cross.