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what is the working of hall effect sensor ??explain the below fig

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swethamenon

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In this fig what are the transistor pairs doing?
 

Assume A is a standard operational amplifier with e.g. 20 mA maximum output current and compensation current Is is is as high as 200 mA. Then you need a current booster stage like the complementary emitter follower shown in the schematic.
 

Assume A is a standard operational amplifier with e.g. 20 mA maximum output current and compensation current Is is is as high as 200 mA. Then you need a current booster stage like the complementary emitter follower shown in the schematic.

Is it darlington pair??
how this working here?
power amplifier n emitter follower pair
 

Is it darlington pair??
how this working here?
power amplifier n emitter follower pair

It is not a darlington amplifier it is a Class B power amplifier

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They work by stepping up the current of the signal. More like current amplifiers than Voltage amplifiers like CE and other configurations
 


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