Question
How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network’s input and output?
Answer Options
- A) Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground
- B) Two capacitors are in series between the input and output, and an inductor is connected between the two capacitors and ground
- C) An inductor is connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output
- D) A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between the input and output
Correct Answer: D
Explanation
A filter network’s shape (L, T, or Pi) refers to the arrangement of its components, and its function (low-pass, high-pass) is determined by which component is placed in series and which is placed in shunt (to ground). A low-pass filter must contain a series inductor (which blocks high frequencies) and a shunt capacitor (which shunts high frequencies to ground).
A Pi-network uses three components arranged like the Greek letter Pi (\pi). For a low-pass function, it must have shunt components at both ends and a series component in the middle. Therefore, the arrangement is: A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between the input and output .
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