Electronic Devices-Special-Purpose Op-Amp Circuits
Electronic Devices-Special-Purpose Op-Amp Circuits
1. The voltage gain of a basic instrumentation amplifier is set by a(n)
- diode
- capacitor.
- resistor
- inductor.
2. A basic ________ amplifier is formed by three op-amps and seven resistors.
- instrumentation
- isolation
- log
- antilog
3. Instrumentation amplifiers are normally used to measure
- small differential signal voltages.
- signals superimposed on a common-mode voltage often much larger than the signal voltage.
- both of the above
- none of the above
4. A(n) ________ amplifier is a differential voltage-gain device that amplifies the difference between the voltages existing at its two input terminals.
- instrumentation
- isolation
- operational transconductance
- log
5. The main purpose of an instrumentation amplifier is to amplify ________ signals that are riding on ________ common-mode voltages.
- small, small
- small, large
- large, small
- large, large
6. A log amplifier may use the ________ junction of a BJT in the feedback loop.
- base-collector
- base-emitter
- emitter-collector
- emitter-ground
7. A current-to-voltage converter produces a
- constant output voltage for a variable input current.
- variable output voltage for a constant input current.
- proportional output voltage for a variable input current.
- proportional output current for a variable input voltage.
8. A log amplifier has ________ in the feedback loop.
- a diode
- a BJT
- a resistor
- either a diode or a BJT
9. What is (are) the principal area(s) of application for isolation amplifiers?
- medical
- power plant
- automation
- all of the above
10. A constant-current source delivers a load current that
- remains constant when the load resistance changes
- varies with load resistance.
- varies inversely with load resistance.
- varies inversely with input voltage.