Special-Purpose Op-Amp Circuits 2 Questions and Answers

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Q11
The operational transconductance amplifier (OTA) is primarily a ________ -to- ________ amplifier.
  • A current, voltage
  • B voltage, current
  • C current, resistance
  • D resistance, current
Answer: Option B
Q12
The main difference between the isolation amplifier and an instrumentation amplifier is
  • A an instrumentation amplifier has an input stage.
  • B an instrumentation amplifier has an output stage.
  • C an instrumentation amplifier has a differential stage.
  • D the input, output, and power supply stages of an isolation amplifier are all electrically isolated from each other.
Answer: Option D
Q13
An antilog amplifier has a ________ in series with the input.
  • A BJT
  • B diode
  • C diode or BJT
  • D resistor
Answer: Option C
Q14
A(n) ________ amplifier provides "a barrier" between the input and output for the protection of human life or sensitive equipment.
  • A instrumentation
  • B isolation
  • C operational transconductance
  • D voltage-to-current
Answer: Option B
Q15
Transconductance is the ratio of the output
  • A current to the input voltage.
  • B current to the input current.
  • C voltage to the input voltage.
  • D voltage to the input current.
Answer: Option A
Q16
The OTA has a ________ input impedance and a ________ CMRR.
  • A high, low
  • B low, high
  • C high, high
  • D low, low
Answer: Option C
Q17
The log of a number is the
  • A base to which the power must be raised to get that number.
  • B power to which the base must be raised to get that number.
  • C base of that number.
  • D power of that number.
Answer: Option B
Q18
What is a key characteristic of an instrumentation amplifier?
  • A high CMRR
  • B high output offset
  • C high output impedance
  • D none of the above
Answer: Option A
Q19
In logarithmic signal compression,
  • A large and small voltages are compressed equally.
  • B large voltages are compressed more than small voltages
  • C large voltages are compressed less than smaller voltages.
  • D none of the above
Answer: Option B
Q20
What part of the characteristic curve of a diode is useful for log amplifiers?
  • A the log region above 0.7 V
  • B the log region below 0.7 V
  • C the log region between 0 V and 0.7 V
  • D the log region below the zener voltage
Answer: Option C

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