Do both IMPATT and TRAPATT microwave diodes rely on the avalanche effect as part of their operation?

Question

Solve this multiple-choice question and choose the correct option.

Accepted Answer

Introduction / Context:IMPATT (IMPact Avalanche Transit-Time) and TRAPATT (TRApped Plasma Avalanche Triggered Transit) diodes are negative-resistance microwave devices used in oscillators and amplifiers. Given Data / Assumptions: Both devices use avalanche breakdown to initiate carrier multiplication. Transit-time effects provide the necessary phase delay for negative resistance. Concept / Approach:In IMPATT, carriers generated by avalanche are swept across the drift region, producing a 180° current–voltage phase shift. TRAPATT also starts with avalanche, but operates with a trapped plasma domain and typically exhibits higher efficiency and lower operating frequency than IMPATT. Step-by-Step Solution: Avalanche multiplication → carrier surge.Transit-time through drift region → phase delay leading to negative resistance.Both devices depend on the avalanche trigger to start the process. Verification / Alternative check:Standard microwave device references categorize both as avalanche transit-time devices, differing in domain dynamics and efficiency. Why Other Options Are Wrong: Statements that only one is avalanche-based are incorrect.Frequency limits (e.g., 'only above 100 GHz') are irrelevant to the avalanche principle. Common Pitfalls: Confusing Gunn diodes (transferred electron effect) with avalanche devices. Final Answer: True

Do both IMPATT and TRAPATT microwave diodes rely on the avalanche effect as part of their operation?

More Questions from Microwave Communication

Discussion & Comments