The major disadvantages of the IMPATT diodes are:
(1) Dc power is drawn due to induced electron
current in the external circuit, IMPATT diodes
have low efficiency.
(2) Tend to be noisy
due to the avalanche process and to the high
level of operating
current.
(3) A typical noise figure is 30dB which is worse than
that of Gunn diodes.
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