Question
Which describes a Pi-L network?
Answer Options
- A) A Phase Inverter Load network
- B) A Pi-network with an additional output series inductor
- C) A network with only three discrete parts
- D) A matching network in which all components are isolated from ground
Correct Answer: B
Explanation
A Pi-L network is a very popular type of impedance matching and filtering network used in the output stages of RF power amplifiers. It is an extension of the basic three-component Pi-network (\pi).
The Pi-L network is best described as a Pi-network with an additional output series inductor. It consists of a shunt capacitor (input), a series inductor, a shunt capacitor (mid-point), and then a second, added series inductor at the output. This extra series inductor gives the filter a higher total Q, which results in much greater harmonic suppression than the simple Pi-network.
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