Topic: Microwave Engineering
Which device is typically used for low noise amplification in microwave receivers?
- A. Klystron
- B. Travelling Wave Tube Amplifier
- C. Tunnel Diode
- D. HEMT
Answer: D. HEMT
Explanation: High Electron Mobility Transistors (HEMTs) are solid-state devices specifically engineered for high gain and exceptionally low noise figure at microwave and millimeter-wave frequencies. They are widely used as Low Noise Amplifiers (LNAs) in receiver front-ends.