PCB Transmission Line Quiz

A PCB transmission line is a type of interconnection used for moving signals from their transmitters to their receivers on a printed circuits board. They are very complex to understand, which is why we created this quiz. Find out how much you know about PCB transmission lines!

Question #1: How many conductors a PCB transmission line is usually composed of?

One Two Three

Question #2: What are usually these conductors?

A signal trace and a ground plane. A signal trace and fiberglass. A signal trace and ceramic.

Question #3: Which of the following is called a coplanar transmission line?

Question #4: What is the volume between the two conductors?

A copper foil. A very high-loss dielectric. A very low-loss dielectric.

Question #5: Why do transmission lines need to have a controlled impedance at high frequencies?

To avoid signal reflection. To avoid crosstalk. All of the above.

Question #6: Electromagnetic signals travel in vacuum or air at the same speed as of light. Why do signals travel on PCB transmission lines at a slower speed?

Because they are affected by the dielectric constant of the PCB material. Because they are affected by electromagnetic interference. Because they need to go as slow as possible to avoid crosstalk.

Question #7: What does “tpd” refer to?

Propagation dielectric Propagation delay Propagation density

Question #8: What is the propagation delay?

It is the time taken by a signal to propagate over a unit length of the transmission line. It is the signal speed in vacuum or air, which equals 85 picoseconds/inch. It is the signal speed on striplines, which is half than in air.

Question #9: Which of the following equations calculates the propagation delay on microstrips?

Question #10: What is approximately the signal speed for Isola 370HR materials on a stripline?

1.8 inch/nanosecond 3.4 inch/nanosecond 5.9 inch/nanosecond

Question #11: What is approximately the propagation delay for Rogers 4000 series materials on a microstrip?

139 picoseconds/inch 128 picoseconds/inch 85 picoseconds/inch

<p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal;">Congratulations, you know a lot about PCB transmission lines! Why don’t you try our <a href="https://www.protoexpress.com/blog/controlled-impedance-quiz/">Controlled Impedance Quiz</a>?</p> <p class="MsoNormal" style="margin-bottom: .0001pt; line-height: normal;">It looks like you still have one thing or two to learn about PCB transmission lines! Read our article “<a href="https://www.protoexpress.com/blog/pcb-transmission-line/">What is a PCB transmission line?</a>” and take the quiz again. You will definitely pass this time!</p>

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