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Questions and Answers
What is the output phase of an ideal op-amp when the input signal is inverting?
What is the output phase of an ideal op-amp when the input signal is inverting?
Which electrical characteristic is not exhibited by an ideal op-amp?
Which electrical characteristic is not exhibited by an ideal op-amp?
Why does an ideal op-amp require infinite bandwidth?
Why does an ideal op-amp require infinite bandwidth?
Why does an ideal op-amp have infinite voltage gain?
Why does an ideal op-amp have infinite voltage gain?
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What is the output voltage for an ideal op-amp when the inverting terminal is zero?
What is the output voltage for an ideal op-amp when the inverting terminal is zero?
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How is the output voltage obtained for an ideal op-amp?
How is the output voltage obtained for an ideal op-amp?
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For Vd > ±4VT, what function will the differential amplifier act as?
For Vd > ±4VT, what function will the differential amplifier act as?
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How are arbitrary signals represented when applied to the input of a transistor?
How are arbitrary signals represented when applied to the input of a transistor?
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Define the total current (IQ) equation in differential amplifier with constant current bias.
Define the total current (IQ) equation in differential amplifier with constant current bias.
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Constant current source in a differential amplifier is also called a current mirror.
Constant current source in a differential amplifier is also called a current mirror.
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When will the mirror effect be valid?
When will the mirror effect be valid?
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Study Notes
Here are the study notes for the text:
- Differential Amplifier*
- A differential amplifier is a type of op-amp configuration that amplifies the difference between two input signals.
- It has two input terminals, one inverting and one non-inverting.
- The output voltage is proportional to the difference between the two input signals.
- Characteristics of Ideal Op-Amp*
- Infinite voltage gain
- Infinite bandwidth
- Zero output resistance
- Infinite input resistance
- Zero input current
- Types of Op-Amp Configurations*
-
Inverting Amplifier:
- Input signal is applied to the inverting terminal.
- Output voltage is inverted and amplified.
-
Non-Inverting Amplifier:
- Input signal is applied to the non-inverting terminal.
- Output voltage is amplified but not inverted.
-
Differential Amplifier:
- Two input signals are applied to the input terminals.
- Output voltage is proportional to the difference between the two input signals.
- Differential Mode Gain and Common Mode Gain*
- Differential Mode Gain: The gain of the amplifier when the input signals are differential.
- Common Mode Gain: The gain of the amplifier when the input signals are common mode.
- Common Mode Rejection Ratio (CMRR)*
- The ratio of the differential mode gain to the common mode gain.
- CMRR = 20 log (ADM / ACM)
- A higher CMRR indicates better rejection of common mode signals.
- Improving CMRR*
- Increasing the differential mode gain (ADM) improves CMRR.
- Decreasing the common mode gain (ACM) improves CMRR.
- Constant Current Source*
- A constant current source is used in differential amplifiers to improve CMRR.
- The current source is called a "current mirror".
- Open-Loop Configuration*
- An open-loop configuration is not used in linear applications because the output switches between positive and negative saturation levels.
- Any positive input signal drives the output to saturation level.
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Description
Quiz questions on operational amplifier circuits, analyzing output signals and voltage gain.
