Question

One way of creating biased diode clipping circuits without the need for an additional EMF supply is to use _______.
1. Zener diodes
2. PIN diodes
3. Tunnel diodes
4. Varactor diodes

Answer 1

Correct Answer - Option 1 : Zener diodes

Explanation:

One way of creating biased diode clipping circuits without the need for an additional EMF supply is to use Zener Diodes.

• The use of a bias voltage means that the amount of the voltage waveform that is clipped off can be accurately controlled. But one of the main disadvantages of using voltage biased diode clipping circuits, is that they need an additional emf battery source which may be a problem.
• One easy way of creating biased diode clipping circuits without the need for an additional emf supply is to us ZENER DIODES.
• As we know, the Zener diode is a another type of diode that has been specially manufactured to operate in its reverse biased breakdown region and as such can be used for voltage regulation or Zener diode clipping applications. In the forward region, the Zener acts just like an ordinary silicon diode with a forward voltage drop of 0.7V (700mV) when conducting.
• However, in the reverse bias region, the voltage is blocked until the Zener diodes breakdown voltage is reached. At this point, the reverse current through the Zener increases sharply but the Zener voltage, V_Z across the device remains constant even if the Zener current, I_Z varies.