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Wireless Communications Fundamentals
Answers
to RF Cafe Quiz #6
All RF Cafe Quizzes make great fodder for
employment interviews for technicians or engineers - particularly those who are
fresh out of school or are relatively new to the work world. Come to think of it,
they would make equally excellent study material for the same persons who are going
to be interviewed for a job. Bonne chance, Viel Glück, がんばろう,
buena suerte, удачи, in bocca al lupo, 행운을 빕니다,
ádh mór, בהצלחה, lykke til, 祝你好運.
Well, you know what I mean: Good luck!
Click here for the complete list of RF Cafe Quizzes.
Note: Some material based on books have quoted passages.
1. Which of the following WLAN standards is on a different frequency band than the others?
a) 802.11a
802.11b/g/n are all in the 2.4 GHz ISM band, 802.11a is in the 5 GHz ISM band.
2. What does the term "ruggedness" refer to in wireless power amplifiers?
c) Ability to withstand load mismatch
A typical ruggedness spec is no damage into a 10:1 VSWR load
3. Which FCC regulation governs the unlicensed ISM band?
a) Part 15
FCC Part 15 governs the unlicensed ISM band for intentional, unintentional, and incidental radiators.
4. In which semiconductor technology are the majority of cellphone PAs manufactured?
c) GaAs/InGaP
Many WLAN PAs are built in SiGe and Si, and one or two experimental phone PAs are being built in Si, but the vast majority of phone PAs are built in GaAs HBT or InGaP HBT.
5. What is a major advantage of LTCC substrates?
d) All the above
Because of the high dielectric constant of the material, relatively large distributed components can be integrated into the substrate, which decreases the number of discrete components needed. The higher thermal conductivity also helps with heat dissipation.
6. Which phone standard supports the highest data rate?
c) EDGE
iDEN=64kbps, GPRS=21.4kbps/time slot, EDGE=384kbps, GSM=14.4kbps
7. Which component is typically not part of a front-end module (FEM)?
a) Power amplifier
Transmit modules (TxM) incorporates a FEM + PA
8. Which two systems are most likely to experience concurrent operation problems?
b) Bluetooth + WLAN
Bluetooth and WLAN (802.11b/g/n) both operate on the 2.5 GHz ISM band.
9. An isolator is typically required at the output of the PA for which transmitter system
d) CDMA/W-CDMA
CDMA/W-CDMA power amplifiers, due to their highly linear region of operation, cannot tolerate a very high mismatch (VSWR) and must be protected with an isolator.
10. What is the commonly claimed nominal operational range for Bluetooth?
d) All the above
Sure it's stupid (true, though, since they are all equivalent lengths), but a little levity in an interview can lighten the load.
Posted April 9, 2021
Copyright: 1996 - 2026 |
About RF Cafe RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived... |
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