When analyzing a closed-loop circuit containing an ideal operational amplifier, what assumption must be applied regarding the currents entering the inverting and non-inverting input pins?
No current flows into either input terminal
To analyze a closed-loop circuit containing an ideal operational amplifier, understanding the basic assumptions regarding the behavior of an ideal operational amplifier is crucial. One key assumption involves the currents at the input terminals.
- Operational Amplifier Characteristics:
An ideal operational amplifier is characterized by infinite input impedance. This means that it prevents any current from flowing into the input terminals, both inverting (-) and non-inverting (+).
- Implications of Infinite Input Impedance:
Due to infinite input impedance, the current into the inverting and non-inverting input pins is effectively zero in an ideal operational amplifier.
- Assumptions for Ideal Operation:
One of the basic assumptions when analyzing circuits with an ideal operational amplifier is that no current flows into either input terminal.
- Comparison with Given Options:
- The correct option — "No current flows into either input terminal" — aligns with the fundamental characteristic of an ideal op-amp.
- Other options contradict the principle of infinite input impedance:
- "A small bias current flows into each terminal" implies non-zero input current, which is incorrect for an ideal op-amp.
- "Current flows only into the non-inverting terminal" indicates asymmetry in input behavior, which is false for an ideal op-amp.
- "Equal and opposite currents flow into both terminals" suggests balanced but non-zero input currents, also incorrect for an ideal op-amp.
Thus, considering the aforementioned points, we conclude that the suitable assumption for a closed-loop circuit with an ideal operational amplifier is that no current flows into either input terminal.
Similar Questions
The Schmitt trigger circuit is a modification of which of the following multivibrators?
In an Op-Amp inverting amplifier, the pin 2 of 741 IC is at virtual ground. This statement is based on which law?
The Common Mode Rejection Ratio (CMRR) of an ideal OP-Amp is ________.
In an op-amp, the input impedance is _______ and the output impedance is _______.
If a capacitor is placed in the feedback path of an op-amp circuit, then the circuit can act as
- In an operational amplifier integrator circuit, which component acts as feedback between the output and the input?
Which operational amplifier configuration is commonly used in zero crossing detectors?
If the input resistor of an inverting amplifier using OP-AMP is doubled and the feedback resistor remains the same, what happens to the magnitude of voltage gain?
To convert an op-amp integrator into a practical integrator (avoiding low-frequency saturation), which component is typically added in parallel with the feedback capacitor?
What happens to the gain of a non-inverting amplifier using OP-AMP if the feedback resistor value is increased by 5 % while keeping the input resistor constant? (Assuming the OP-AMP remains in linear range for operation.)
Important Questions from Operational Amplifiers
An oscillator circuit which is meant for converting sine wave signal into square wave signal is called a
Which one of the following options is true for an ideal Op-amp?
The maximum rate that an output of an operational amplifier can change
CMRR for an Op-amp should be
In order for an output to swing above and below a zero reference, the op-amp circuit requires-
