Amplified diode circuit?

Question

(i cant find any valuable answers in the internet)

can somebody explain me the difference of using a amplified diode to a zener diode(advantages disadvantages)

or explain me some concept of amplified diode circuit

my teacher says that amplified diode is also a zener diode it just that it uses a npn transistor.

i need to formulate a Question and Answer in a statement form with 5 choices of answer.

thank you, hoping some lots of knowledgable guys can give knowledge about this

Answer 1

what is an "amplified diode"? An internet search turns up nothing.

From your wording, I suspect this is a NPN connected as an emitter follower with the zener in the base to ground with a bias resistor.

The advantage is more power. A typical zener can only handle 1 watt, whereas power transistors can handle 100s of watts.

Also, a zener as a regulator will always dissipate the power set by the series resistor, whereas the regulator will only supply the current demanded by the load.

Regulator will output a voltage of the zener diode voltage minus 0.6 or 0.7 volts, so it is not as accurate, and the 0.6/7 volts will change with temperature.

The regulator also keeps the zener current fairly constant, thus more accurate.

"Question and Answer in a statement form with 5 choices of answer"

you can do this, whatever it is.

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