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Wireless Communications Fundamentals
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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 |
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