Question
What is the purpose of adding an inductor to a Pi-network to create a Pi-L-network?
Answer Options
- A) Greater harmonic suppression
- B) Higher efficiency
- C) To eliminate one capacitor
- D) Greater transformation range
Correct Answer: A
Explanation
A Pi-L network is a modification of the basic Pi-network impedance matcher, created by replacing the final shunt capacitor with a series inductor followed by a shunt capacitor. This structural change significantly increases the number of reactive elements in the signal path, which is directly related to filter performance.
Since the overall circuit now contains more reactive components (two inductors and two capacitors) compared to the Pi-network (one inductor and two capacitors), the circuit has a higher effective Q and a sharper rolloff beyond the desired operating frequency. The primary purpose of this modification is to achieve greater harmonic suppression, making the Pi-L network a preferred choice in the output stage of transmitters.
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