The steady state output (Vout), of the circuit shown below, will
Correct Answer :
saturate to -VEE
Solution :
The correct option is saturate to -VEE.
Let's analyze the given circuit diagram step-by-step:
1. Identify the Circuit Configuration:
The circuit represents an op-amp integrator. The non-inverting terminal (+) is connected to ground through a resistor , and a feedback capacitor is connected between the inverting input terminal (-) and the output terminal . The input source of is applied through resistor to the inverting input terminal.
2. Analyze the Terminal Voltages:
Since no current enters the non-inverting input terminal of an ideal operational amplifier, the voltage at the non-inverting terminal is:
Assuming the op-amp is operating in its linear region initially, we can apply the virtual short concept:
3. Determine the Current and Output Voltage:
The current entering the node at the inverting terminal through resistor is:
Because the input impedance of the op-amp is infinite, this current cannot enter the inverting terminal and must flow entirely through the feedback capacitor towards the output:
The current through the capacitor is related to the voltage across it by:
Equating the two expressions for current:
Integrating both sides with respect to time :
4. Analyze the Steady State Behavior:
The equation shows that the output voltage decreases linearly over time because the input voltage is a constant positive DC value (). As time approaches infinity (), the output voltage continues to decrease until it hits the negative power supply limit of the op-amp. Since the negative supply voltage rail is , the output voltage cannot fall below this limit. Therefore, in the steady state, the output will saturate to -VEE.
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