Floyd Self-test Chapter 14 Topic Outline
- Floyd Self-test in Instrumentation Amplifiers
- Floyd Self-test in Isolation Amplifiers
- Floyd Self-test in Operational Transconductance Amplifiers (OTAs)
- Floyd Self-test in Log and Antilog Amplifiers
- Floyd Self-test in Converters and Other Op-Amp Circuits
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. To make a basic instrumentation amplifier, it takes
- (a) one op-amp with a certain feedback arrangement
- (b) two op-amps and seven resistors
- (c) three op-amps and seven capacitors
- (d) three op-amps and seven resistors
2. Typically, an instrumentation amplifier has an external resistor used for
- (a) establishing the input impedance
- (b) setting the voltage gain
- (c) setting the current gain
- (d) interfacing with an instrument
3. Instrumentation amplifiers are used primarily in
- (a) high-noise environments
- (b) medical equipment
- (c) test instruments
- (d) filter circuits
4. Isolation amplifiers are used primarily in
- (a) remote, isolated locations
- (b) systems that isolate a single signal from many different signals
- (c) applications where there are high voltages and sensitive equipment
- (d) applications where human safety is a concern
- (e) answers (c) and (d)
5. The two parts of a basic isolation amplifier are
- (a) amplifier and filter
- (b) input stage and coupling stage
- (c) input stage and output stage
- (d) gain stage and offset stage
6. The stages of many isolation amplifiers are connected by
- (a) copper strips
- (b) a capacitor
- (c) microwave links
- (d) current loops
7. The characteristic that allows an isolation amplifier to amplify small signal voltages in the presence of much greater noise voltages is its
- (a) CMRR
- (b) high gain
- (c) high input impedance
- (d) magnetic coupling between input and output
8. The term OTA means
- (a) operational transistor amplifier
- (b) operational transformer amplifier
- (c) operational transconductance amplifier
- (d) output transducer amplifier
9. In an OTA, the transconductance is controlled by
- (a) the dc supply voltage
- (b) the input signal voltage
- (c) the manufacturing process
- (d) a bias current
10. The voltage gain of an OTA circuit is set by
- (a) a feedback resistor
- (b) the transconductance only
- (c) the transconductance and the load resistor
- (d) the bias current and supply voltage
11. An OTA is basically a
- (a) voltage-to-current amplifier
- (b) current-to-voltage amplifier
- (c) current-to-current amplifier
- (d) voltage-to-voltage amplifier
12. The operation of a logarithmic amplifier is based on
- (a) the nonlinear operation of an op-amp
- (b) the logarithmic characteristic of a pn junction
- (c) the reverse breakdown characteristic of a pn junction
- (d) the logarithmic charge and discharge of an RC circuit
13. If the input to a log amplifier is x, the output is proportional to
- (a) ex
- (b) ln x
- (c) log10 x
- (d) 2.3 log10x
- (e) answers (a) and (c)
- (f ) answers (b) and (d)
14. If the input to an antilog amplifier is x, the output is proportional to
- (a) elnx
- (b) ex
- (c) ln x
- (d) e-x
15. A constant-current source provides a non-changing current to a load
- (a) for all values of current
- (b) for all values of load resistance
- (c) for all values of load resistance within defined limits
16. A peak detector consists of
- (a) a comparator, a transistor, and a capacitor
- (b) a comparator, a diode, and a capacitor
- (c) a comparator, a diode, and an inductor
- (d) an integrator, a diode, and a capacitor
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