Electronic Devices-Special-Purpose Op-Amp Circuits
Electronic Devices-Special-Purpose Op-Amp Circuits
11. The operational transconductance amplifier (OTA) is primarily a ________ -to- ________ amplifier.
- current, voltage
- voltage, current
- current, resistance
- resistance, current
12. The main difference between the isolation amplifier and an instrumentation amplifier is
- an instrumentation amplifier has an input stage.
- an instrumentation amplifier has an output stage.
- an instrumentation amplifier has a differential stage.
- the input, output, and power supply stages of an isolation amplifier are all electrically isolated from each other.
13. An antilog amplifier has a ________ in series with the input.
- BJT
- diode
- diode or BJT
- resistor
14. A(n) ________ amplifier provides "a barrier" between the input and output for the protection of human life or sensitive equipment.
- instrumentation
- isolation
- operational transconductance
- voltage-to-current
15. Transconductance is the ratio of the output
- current to the input voltage.
- current to the input current.
- voltage to the input voltage.
- voltage to the input current.
16. The OTA has a ________ input impedance and a ________ CMRR.
- high, low
- low, high
- high, high
- low, low
17. The log of a number is the
- base to which the power must be raised to get that number.
- power to which the base must be raised to get that number.
- base of that number.
- power of that number.
18. What is a key characteristic of an instrumentation amplifier?
- high CMRR
- high output offset
- high output impedance
- none of the above
19. In logarithmic signal compression,
- large and small voltages are compressed equally.
- large voltages are compressed more than small voltages
- large voltages are compressed less than smaller voltages.
- none of the above
20. What part of the characteristic curve of a diode is useful for log amplifiers?
- the log region above 0.7 V
- the log region below 0.7 V
- the log region between 0 V and 0.7 V
- the log region below the zener voltage