All RF Cafe quizzes make great fodder
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.
Click here for the complete list of
RF Cafe Quizzes.
Note: Some material based on books have quoted passages.
1. Why are S-parameters preferred for high frequency network
a) They make matrix manipulation "S"impler
b) Open and short circuit terminations are not required
c) There actually is no reason to prefer them
d) They are a grandfathered de facto standard
2. To what temperature is noise figure normally referenced?
a) 0 dBT
b) 0 °C
c) 290 °C
d) 290 K
3. Where does the Quantum Confinement (QC) effect occur
in a MOSFET?
a) At the source
b) At the gate
c) At the drain
d) Throughout the entire device
4. Why is substrate resistance important?
a) It makes no difference
b) It sets the device impedance
c) It drives up costs
d) It degrades fMAX and FMIN
5. At what rate has MOSFET gate shrink scaling factor
(√2) occurred since the 1970s?
a) Every year
b) Every 2-3 years
c) Every 4-5 years
d) Every decade
6. Who developed the first High Electron Mobility Transistor
a) Motorola (USA)
b) China Global Semiconductor (China)
c) Fujitsu (Japan)
d) Thomson Semiconductors (France)
7. When is coplanar waveguide (CPW) more desirable than
microstrip on a semiconductor substrate?
c) When a ground plane located on the top of the IC is not feasible.
d) When the frequency is greater than 1 GHz
8. What is the definition of Power Added Efficiency (PAE)
of a power amplifier?
a) ∑(POUT, PIN, PDC)
b) ∏(POUT, PIN, PDC)
c) (PRF - PIF) * PDC
d) (POUT - PIN) / PDC
9. What is the best type of biasing for an Low Noise Amplifier
(LNA) at high temperature?
a) Proportional to Absolute Temperature (PTAT) bias
b) Polynomial Heuristical with Absolute Temperature (PHAT) bias
c) Synergistic to Absolute Temperature (STAT) bias
d) Complimentary to Absolute Temperature (CTAT) current mirror bias
10. How are in-phase (I) and quadrature (Q) components
of an RF signal generated?
a) With a 90° (quadrature) equal amplitude coupler
b) By converting to digital then delaying the signal by 1/4 of a clock
c) By adding signal until a 90° phase shift is obtained
d) By adding signal until a -90° phase shift is obtained
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the answers and explanations.