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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 typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Wireless Communications Fundamentals
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

b) 802.11b

c) 802.11g

d) 802.11n

2. What does the term "ruggedness" refer to in wireless power amplifiers?

a) Ability to withstand thermal stress

b) Ability to withstand mechanical stress

c) Ability to withstand load mismatch

d) All the above

3. Which FCC regulation governs the unlicensed ISM band?

a) Part 15

b) Chapter 11

c) 815.00

d) Subsection 11

4. In which semiconductor technology are the majority of cellphone PAs manufactured?

a) Si/SiCMOS

b) GaN

c) GaAs/InGaP

d) SiGe

5. What is a major advantage of Low Temperature Co-fired Ceramic (LTCC) substrates?

a) Densely integrated passive components

b) Better thermal dissipation

c) Lower bill of materials

d) All the above

6. Which phone standard supports the highest data rate?

a) iDEN

b) GPRS

c) EDGE

d) GSM

7. Which component is typically not part of a front-end module (FEM)?

a) Power amplifier

b) Filter

c) Switch

d) Controller

8. Which two systems are most likely to experience concurrent operation problems?

a) WLAN + GSM

b) Bluetooth + WLAN

c) GSM + W-CDMA

d) Bluetooth + AMPS

9. An isolator is typically required at the output of the PA for which transmitter system

a) EDGE

b) Bluetooth

c) GSM

d) CDMA/W-CDMA

10. What is the commonly claimed nominal operational range for Bluetooth?

a) 10 m

b) 32.8 ft

c) 1.057x10^-15 lt-yr

d) All the above

Need some help? Click here for the answers and explanations.

Posted April 9, 2021

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Wireless Communications FundamentalsRF Cafe Quiz #6

Wireless Communications Fundamentals
RF Cafe Quiz #6