Questions and Answers
Which characteristic is not necessarily true for an op-amp?
What happens to the gain-bandwidth product of an op-amp when negative feedback is used?
What determines the maximum output voltage swing of an op-amp?
How many inputs and outputs does an op-amp have?
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What is the relationship between the output and input of an integrator?
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What type of amplifier is used for amplifying small signals in a noisy environment?
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What type of amplifier is used for compression of large dynamic range signals?
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What is an operational transconductance amplifier (OTA) basically?
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Which type of amplifier is configured with a diode on the feedback and resistor on the input?
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What type of filter has two pass bands?
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What is the primary trigger for oscillation?
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What sets the gain to make up for the loss of the feedback network in a Phase-Shift Oscillator?
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What is the basis for the op-amp integrator that can be used to create a?
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How does a MOSFET operate?
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What type of amplifier is an OTA?
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What happens to a pMOS when there is a high input?
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Study Notes
Op-Amp Characteristics
- High input impedance is a characteristic of an op-amp.
- Low power consumption is not necessarily a characteristic of an op-amp.
- Low output impedance is a characteristic of an op-amp.
- High gain is a characteristic of an op-amp.
Negative Feedback
- When negative feedback is used, the gain-bandwidth product of an op-amp decreases.
Op-Amp Parameters
- Input offset voltage is determined by the op-amp and the power supply voltage.
- Input bias current is determined by the op-amp and the power supply voltage.
- Input offset current is determined by the op-amp and the power supply voltage.
- Maximum output voltage swing is determined by the op-amp and the power supply voltage.
Op-Amp Configuration
- An op-amp has two inputs and one output.
Integrator and Differentiator
- The output of an integrator is proportional to the RC time constant and the rate at which the input is changing.
- In an ideal integrator, when a constant positive input voltage in the form of a step or pulse is applied, the output is a ramp that increases positively until the op-amp saturates at its maximum positive level.
Operational Transconductance Amplifier (OTA)
- An OTA is basically a voltage-to-current amplifier.
Inverting Amplifier
- In an inverting amplifier, the output is 180° out of phase with the input.
Specialized Amplifiers
- An instrumentation amplifier is used for amplifying small signals in a noisy environment.
- A log and antilog amplifier is used for compression of large dynamic range signals.
- An isolation amplifier is used for isolating signals.
Log and Antilog Amplifiers
- A log amplifier is configured with a diode on the feedback and a resistor on the input.
Filters
- A band-pass filter has its bandwidth equal to its cutoff frequency.
- A low-pass filter has one pass band.
- A high-pass filter has one pass band.
- A band-stop filter has two stop bands.
Oscillators
- The primary trigger for oscillation is obtained from noise voltage.
- In a phase-shift oscillator, the voltage divider in the negative feedback loop sets the gain to make up for the loss of the feedback network.
- An op-amp integrator can be used as the basis for a triangle-wave oscillator.
MOSFET Operation
- A pMOS controls the current conduction between the source and the drain, using the potential difference applied at the gate voltage as a control variable.
- When there is a high input, a pMOS is turned off.
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Description
This quiz covers the fundamental characteristics of operational amplifiers, including input impedance, gain, and output impedance. It also explores the effects of negative feedback and power supply voltage on op-amp performance.
