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Which of these is a not drawback of Zener diode shunt regulator?

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Which of these is a not drawback of Zener diode shunt regulator?

(a) The output voltage is fixed

(b) The output voltage can vary with temperature

(c) Variation in load current needs to be minimal

(d) It is difficult to design

I had been asked this question in a national level competition.

My enquiry is from Voltage Regulators topic in chapter Regulators of Analog Circuits

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The correct choice is (d) It is difficult to design

The best explanation: The Zener diode shunt regulator is a simple voltage regulator circuit that provides a fixed output voltage. However, due to the presence of the Zener diode, the output is temperature dependent because the breakdown voltage of Zener diode depends on temperature. When load current varies a lot, then Zener current also varies which causes a change in output voltage.

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