Question
Which of the following materials supports the highest frequency of operation when used in MMICs?
Answer Options
- A) Silicon
- B) Silicon nitride
- C) Silicon dioxide
- D) Gallium nitride
Correct Answer: D
Explanation
The maximum operating frequency of a semiconductor device is fundamentally limited by the material’s properties, specifically its band gap and electron mobility. While Gallium Arsenide (GaAs) is superior to Silicon for high frequencies, even newer materials offer a greater performance ceiling.
Gallium Nitride (GaN) is a relatively new III-V semiconductor that offers exceptionally high power density and extremely fast switching speeds. Its wide bandgap allows it to handle very high voltages, and its mobility supports operation into the millimeter-wave range. GaN supports the highest frequency of operation (up to tens of GHz) and is increasingly used in high-power RF and microwave monolithic integrated circuits (MMICs) and power amplifiers.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!