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!
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RF Cafe Quizzes.
Note: Some material based on books have
This quiz is based on the information presented in
Microwave Mixer Technology and Applications, by Bert Henderson and Edmar Camargo.
Graciously provided by
1. What is the name given to a receiver circuit whose oscillator circuit
is biased just shy of the oscillation point in order to increase signal sensitivity?
2. What is the name given to a mixer configuration that
cancels out received signal frequencies that are equidistant from the oscillator frequency as
the intended signal, but on the opposite side of the oscillator; i.e., on the opposite equivalent
a) Image reject
b) Sideband reject
c) Mirror reject
d) Opposite reject
3. What is Error Vector Magnitude
a) The magnitude expected vector
b) The magnitude of the measured
c) The difference between the expected vector magnitude and the measured vector
d) The sum of the expected vector magnitude and the measured vector magnitude
4. What is a "cold FET?"
a) A FET bathed in
a cryogenic fluid
b) Slang for a burnt-out FET
c) An insensitive FET
A FET circuit without DC bias
5. Why might a Lange coupler
be preferred over a 3 dB hybrid coupler?
a) Lower insertion loss
Higher power handling
c) Wider bandwidth for impedance matching
bandwidth for impedance matching
6. What are mixer spurious
products comprised of?
a) Small signal LO and small signal RF inputs
Small signal LO and large signal RF inputs
c) Large signal LO and small signal RF inputs
d) Large signal LO and large signal RF inputs
Why does the mechanism of noise generation in a mixer differ than that of an amplifier?
a) Because the device parameters vary in time in response to the LO signal
Because of passive versus active operation
c) Because diodes are noisier than transistors
d) Because a two-port component is different than a 4-port component
8. Why does a cascode amplifier provide higher gain than a single stage?
a) Because of a higher bias current
b) Because of a lower supply voltage requirement
c) Because of higher output impedance and higher reverse isolation
d) Because of
its smaller physical size
9. What is the equivalent
of a triply-balanced mixer?
a) A combination of three singly balanced mixers
A combination of two doubly balanced mixers
c) Three diodes in a star configuration
d) Three diodes in a ring configuration
is a major advantage of the Gilbert cell topology?
a) It has a much lower implementation
b) It uses fewer components required
c) It has a smaller circuit footprint
d) It multiplies the input and output currents to avoid improve linearity
Need some help? Click here for the
answers and explanations.