Topic: Analog Electronics
For a class-A FET power amplifier with 10 V drain supply and 2 A drain current bias providing RF load current of 1 A amplitude. What is the DC to RF efficiency for load resistance of 5 Ή?
- A. 50%
- B. 25%
- C. 35%
- D. 12.5%
Answer: D. 12.5%
Explanation: %Η = ( (1 / √2)^2 * 5 / (10 * 2) ) * 100 = 12.5%.