CHAPTER 14
SPECIAL PURPOSE OP-AMP CIRCUITS
1. Provides dc isolation between input and output
Isolation amplifier
2. Ratio of the output current to the input voltage
Transconductance
3. Transconductance is __________ of an OTA
Gain
4. A comparator with hysteresis where the input voltage is large enough to drive the device into its saturated states
Schmitt trigger
5. The ______________ of a number is the power to which the base must be raised to get that number.
Logarithm
6. An amplifier that produces an output that is proportional to the logarithm of the input.
Log amplifier
7. Used in applications where it is necessary to have an output current that is controlled by an input voltage.
Voltage-to-current converter
8. The circuit used to detect the peak of the input voltage and store that peak voltage on a capacitor.
Peak detector
9. The exponent to which the base e must be raised in order to equal a given quantity.
Natural logarithm
10. In an OTA, transconductance varies with _________.
Bias current
11. Amplifiers that are often used in HF communication systems, including fiber optics, for processing wide dynamic range signals.
Log and antilog amplifiers
12. The key characterisctic of an instrumentation amplifier
CMRR
13. The voltage gain of instrumentation amplifier is set by a
Resistor
14. The log amplifier may use the ___________ junction of a BJT in the feedback loop
Base-emitter
15. The main purpose of an instrumentation amplifier is to amplify _____ signals that are riding on _____ common-mode voltages.
small, large
16. The ___________ of an OTA is the input voltage times the transconductance
Output current
17. The operation of log and antilog amplifiers is based on the __________ characteristics of a pn junction
Nonlinear
(logarithmic)
18. A log amplifier has a pn junction in the feedback loop, and an antilog amplifier has a pn junction in __________ with the input
Series
19. In a peak detector, an op-amp is used as a __________ to charge a capacitor through a diode to the peak value of the input voltage.
Comparator
20. A basic instrumentation amplifier is formed by three op-amps and ________ resistors, including the gain setting resistor.
Seven (7)
21. An oscillator that can be either amplitude or pulse modulated by the signal from the input amplifier
High-frequency oscillator
SPECIAL PURPOSE OP-AMP CIRCUITS
1. Provides dc isolation between input and output
Isolation amplifier
2. Ratio of the output current to the input voltage
Transconductance
3. Transconductance is __________ of an OTA
Gain
4. A comparator with hysteresis where the input voltage is large enough to drive the device into its saturated states
Schmitt trigger
5. The ______________ of a number is the power to which the base must be raised to get that number.
Logarithm
6. An amplifier that produces an output that is proportional to the logarithm of the input.
Log amplifier
7. Used in applications where it is necessary to have an output current that is controlled by an input voltage.
Voltage-to-current converter
8. The circuit used to detect the peak of the input voltage and store that peak voltage on a capacitor.
Peak detector
9. The exponent to which the base e must be raised in order to equal a given quantity.
Natural logarithm
10. In an OTA, transconductance varies with _________.
Bias current
11. Amplifiers that are often used in HF communication systems, including fiber optics, for processing wide dynamic range signals.
Log and antilog amplifiers
12. The key characterisctic of an instrumentation amplifier
CMRR
13. The voltage gain of instrumentation amplifier is set by a
Resistor
14. The log amplifier may use the ___________ junction of a BJT in the feedback loop
Base-emitter
15. The main purpose of an instrumentation amplifier is to amplify _____ signals that are riding on _____ common-mode voltages.
small, large
16. The ___________ of an OTA is the input voltage times the transconductance
Output current
17. The operation of log and antilog amplifiers is based on the __________ characteristics of a pn junction
Nonlinear
(logarithmic)
18. A log amplifier has a pn junction in the feedback loop, and an antilog amplifier has a pn junction in __________ with the input
Series
19. In a peak detector, an op-amp is used as a __________ to charge a capacitor through a diode to the peak value of the input voltage.
Comparator
20. A basic instrumentation amplifier is formed by three op-amps and ________ resistors, including the gain setting resistor.
Seven (7)
21. An oscillator that can be either amplitude or pulse modulated by the signal from the input amplifier
High-frequency oscillator
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