Exercise: Analog Electronics

Questions for: Analog Electronics

Two identical FETs, each characterised by the parameters gm and rd are connected in parallel. The composite FET is then characterised by the parameters
A:
and 2rd
B:
and
C:
2gm and
D:
2gm and 2rd
Answer: C
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A FET is a __________ controlled device whereas a bipolar transistor is a __________ controlled device.
A:
gate, drain
B:
drain, gate
C:
current, voltage
D:
voltage, current
Answer: D
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Which of the following circuit has the greatest bandwidth?
A:
fr = 455 MHz; Q = 10
B:
fr = 455 MHz; Q = 100
C:
fr = 1 MHz; Q = 100
D:
fr = 1 MHz; Q = 10
Answer: D
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A silicon sample A is doped with 1018 Atoms/cm3 of Boron. Another sample B of identical dimensions is doped with 1018 atoms/cm3 of phosphorus. The ratio of electron to hole mobility is 3. The ratio of conductivity of the sample A to B is
A:
3
B:
1/3
C:
2/3
D:
3/2
Answer: B
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In a closed loop non-inverting amplifier, constructed using single break-frequency op-amp, bandwidth with feedback can be written as. (f0 - break frequency, β - gain of the feedback circuit, A - open loop voltage gain, Af - closed loop voltage gain)
A:
B:
C:
D:
Answer: A
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