E6E: Piezoelectric crystals and MMICS: quartz crystals (as used in oscillators and filters); monolithic amplifiers (MMICs)
E6E01:
Which of these filter bandwidths would be a good choice for use in a SSB radiotelephone transmitter?
2.4 kHz at -6 dB
6 kHz at -6 dB
500 Hz at -6 dB
15 kHz at -6 dB
E6E02:
Which of these filter bandwidths would be a good choice for use with standard double-sideband AM transmissions?
6 kHz at -6 dB
1 kHz at -6 dB
500 Hz at -6 dB
15 kHz at -6 dB
E6E03:
What is a crystal lattice filter?
A filter with narrow bandwidth and steep skirts made using quartz crystals
A power supply filter made with interlaced quartz crystals
An audio filter made with four quartz crystals that resonate at 1-kHz intervals
A filter with wide bandwidth and shallow skirts made using quartz crystals
E6E04:
What technique is used to construct low-cost, high-performance crystal ladder filters?
Measure crystal frequencies and carefully select units with a frequency variation of less than 10% of the desired filter bandwidth
Obtain a small quantity of custom-made crystals
Choose a crystal with the desired bandwidth and operating frequency to match a desired center frequency
Measure crystal bandwidth to ensure at least 20% coupling
E6E05:
Which of the following factors has the greatest effect in helping determine the bandwidth and response shape of a crystal ladder filter?
The relative frequencies of the individual crystals
The DC voltage applied to the quartz crystal
The gain of the RF stage preceding the filter
The amplitude of the signals passing through the filter
E6E06:
What is one aspect of the piezoelectric effect?
Physical deformation of a crystal by the application of a voltage
Mechanical deformation of a crystal by the application of a magnetic field
The generation of electrical energy by the application of light
Reversed conduction states when a P-N junction is exposed to light
E6E07:
What is the characteristic impedance of circuits in which almost all MMICs are designed to work?
50 ohms
300 ohms
450 ohms
10 ohms
E6E08:
What is the typical noise figure of a monolithic microwave integrated circuit (MMIC) amplifier?
Approximately 3.5 to 6 dB
Less than 1 dB
Approximately 8 to 10 dB
More than 20 dB
E6E09:
What type of amplifier device consists of a small pill-type package with an input lead, an output lead and 2 ground leads?
A monolithic microwave integrated circuit (MMIC)
A junction field-effect transistor (JFET)
An operational amplifier integrated circuit (OAIC)
An indium arsenide integrated circuit (IAIC)
E6E10:
What typical construction technique is used when building an amplifier for the microwave bands containing a monolithic microwave integrated circuit (MMIC)?
Microstrip construction
Ground-plane "ugly" construction
Point-to-point construction
Wave-soldering construction
E6E11:
How is the operating bias voltage normally supplied to the most common type of monolithic microwave integrated circuit (MMIC)?
Through a resistor and/or RF choke connected to the amplifier output lead
MMICs require no operating bias
Through a capacitor and RF choke connected to the amplifier input lead
Directly to the bias-voltage (VCC IN) lead
E6E12:
What supply voltage do monolithic microwave integrated circuits (MMIC) amplifiers typically require?
12 volts DC
1 volt DC
20 volts DC
120 volts DC
E6E13:
What is the most common package for inexpensive monolithic microwave integrated circuit (MMIC) amplifiers?
Plastic packages
Beryllium oxide packages
Glass packages
Ceramic packages
|
Color key:
|
|
● = Unseen
|
|
● = Weak
|
|
● = Review
|
|
● = Learned
|
|
● = Incorrect answer
|
