Deep Dive: E6A12
The correct answer is D: To protect the gate from static damage. What is the purpose of connecting Zener diodes between a MOSFET gate and its source or drain is to protect the gate from static damage. Zener diodes protect MOSFET gates from ESD. For amateur radio operators, this is important for transistor protection. Understanding this helps when protecting MOSFETs.
Why Other Answers Are Wrong
Option A: Incorrect. Provide voltage reference for reverse-bias gate voltage isn't the purpose - Zener diodes protect from static damage. Voltage reference isn't the purpose. Option B: Incorrect. Protect substrate from excessive voltages isn't the purpose - Zener diodes protect gate from static damage. Substrate protection isn't the purpose. Option C: Incorrect. Keep gate voltage within specifications and prevent overheating isn't the purpose - Zener diodes protect from static damage. Overheating prevention isn't the purpose.
Exam Tip
Zener diodes between MOSFET gate and source/drain = protect gate from static damage. Think 'Z'ener 'D'iodes = 'Z'ap 'D'amage protection (ESD). Zener diodes protect MOSFET gates from ESD. Not voltage reference, not substrate protection, not overheating - just static damage protection.
Memory Aid
Zener diodes between MOSFET gate and source/drain = protect gate from static damage. Think 'Z'ener 'D'iodes = 'E'SD protection. Zener diodes protect MOSFET gates from ESD. Important for transistor protection.
Real-World Example
Connecting Zener diodes between a MOSFET gate and its source or drain: The purpose is to protect the gate from static damage. MOSFET gates are very sensitive to electrostatic discharge (ESD), and Zener diodes clamp the voltage to safe levels. This is the purpose - protect gate from static damage.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E6A
Reference: 2024-2028 Question Pool · E6 - Circuit Components
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E6A topic.