Discussion
Home ‣ Electronics ‣ Special-Purpose Op-Amp Circuits Comments
- Question
The ________ amplifier is ideal for amplitude modulation since its gain is current-controlled.
Options- A. log
- B. operational transconductance
- C. isolation
- D. Schmitt
- Correct Answer
- operational transconductance
- 1. A Schmitt trigger has _________.
Options- A. no trigger points
- B. one trigger point
- C. two trigger points
- D. three trigger points Discuss
- 2. A voltage-to-current converter is used in applications where it's necessary to have an output load current that is controlled by _________.
Options- A. input frequency
- B. output resistance
- C. input voltage
- D. input resistance Discuss
- 3. The external resistor of a typical instrumentation amplifier is used to set the ________.
Options- A. impedance
- B. rejection ratio
- C. gain
- D. isolation Discuss
- 4. To construct an instrumentation amplifier, two op-amps and seven resistors are needed.
Options- A. True
- B. False Discuss
- 5. An OTA is primarily a current-to-voltage amplifier.
Options- A. True
- B. False Discuss
- 6. A(n) ________ amplifier is used if the application requires a high sensitivity to low-level signals and protection from high-voltage associated circuits.
Options- A. basic instrumentation
- B. operational transconductance
- C. log/antilog amplifier
- D. isolation Discuss
- 7. An instrumentation amplifier has extremely high ________, good ________, and high ________.
Options- A. input impedance, common-mode rejection, gain
- B. noise factor, grounding, power
- C. working voltages, current capacity, output impedance
- D. output gain, output loading, power Discuss
- 8. A Schmitt trigger is a comparator with _______.
Options- A. modulation
- B. a closed-loop gain less than one
- C. hysteresis
- D. a high threshold value Discuss
- 9. The gain of an OTA is the ratio of the output current to the input voltage, and is measured in _____________.
Options- A. amps
- B. volts
- C. siemens
- D. no units Discuss
- 10. If an operational transconductance amplifier (OTA) is used as an amplitude modulator, the voltage gain is varied by applying a _________ voltage to the ______ input.
Options- A. demodulation, bias
- B. modulation, bias
- C. bias, modulation
- D. low-frequency, bias Discuss
Special-Purpose Op-Amp Circuits problems
Search Results
Correct Answer: three trigger points
Correct Answer: input voltage
Correct Answer: gain
Correct Answer: False
Correct Answer: False
Correct Answer: isolation
Correct Answer: input impedance, common-mode rejection, gain
Correct Answer: hysteresis
Correct Answer: siemens
Correct Answer: modulation, bias
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