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Microwave Communication - Engineering

Q1:

Consider the following applications
  1. Switch
  2. Attenuator
  3. Phase shifter
  4. Oscillator
In which of the above can a PIN diode be used?

A 1 2 3 and 4

B 1 2 and 3 only

C 1 and 2 only

D 2, 3 and 4 only

ANS:B - 1 2 and 3 only

PIN diode is not used in oscillators.