*Question E7B06:
What is a characteristic of a grounded-grid amplifier?*  

*Correct Answer is  B: Low input impedance*  

### AI Response: (may contain errors)  

A grounded-grid amplifier is a type of RF amplifier where the grid is connected to ground. This configuration has specific characteristics that affect its performance.

### Correct Answer: Low input impedance

- **Why it's correct**: 
  - In a grounded-grid amplifier, the input is applied to the cathode, while the grid is at ground potential. This results in a low input impedance because the input signal sees the cathode as the reference point. The low input impedance is beneficial for matching with low-impedance sources.

### Why the other choices are incorrect:

- **A: High power gain**: 
  - While grounded-grid amplifiers can provide good power gain, they are not characterized by "high" power gain compared to other configurations like grounded-cathode amplifiers. The gain is typically moderate.

- **C: High electrostatic damage protection**: 
  - Grounded-grid amplifiers do not inherently provide high protection against electrostatic discharge. Protection depends more on the design and components used rather than the grounded-grid configuration itself.

- **D: Low bandwidth**: 
  - Grounded-grid amplifiers can actually have a wide bandwidth, especially when designed for RF applications. The bandwidth is not a defining characteristic of this amplifier type.

### Summary

- Grounded-grid amplifiers are known for their low input impedance, making them suitable for specific applications where impedance matching is crucial. Understanding the characteristics of different amplifier configurations is essential for effective circuit design and operation in amateur radio.