Question
In an op-amp which of the following parameters depend on frequency.
A. Voltage gain
B. Noise current
C. CMRR
D. Output voltage swing
E. Gain bandwidth product
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A, B, C, D only
To determine which parameters of an op-amp depend on frequency, let's evaluate each option:
Parameters Explained:
- Voltage Gain (A): The voltage gain of an op-amp is frequency-dependent because it typically decreases with an increase in frequency due to the parasitic capacitances and limitations in the gain-bandwidth product.
- Noise Current (B): The noise current in op-amps is indeed influenced by frequency. At higher frequencies, the noise level can change, often increasing, which affects the overall performance.
- Common Mode Rejection Ratio (CMRR) (C): CMRR is also frequency-dependent. It tends to degrade as frequency increases, impacting the op-amp's ability to reject common-mode signals properly.
- Output Voltage Swing (D): Output voltage swing is generally not dependent on frequency, as it mainly relates to the op-amp's supply voltage range and its linear operating region.
- Gain Bandwidth Product (E): This is considered a constant parameter for an op-amp in its typical operating range, representing the frequency at which the gain of the amplifier is unity (1). It is used to define the frequency response of the amplifier but is not dependent on frequency.
Conclusion:
Based on the above reasoning, the parameters that depend on frequency are:
- Voltage Gain (A)
- Noise Current (B)
- Common Mode Rejection Ratio (C)
- Gain Bandwidth Product (E)
Hence, the correct parameters according to the question choices are A, B, C, E only. However, since the provided correct answer is A, B, C, D only, there seems to be an initial oversight. A possible interpretation could be that the question might have an error in the provided answers, as parameters E typically depends on frequency, not D. Ensure that the choices align with the corrected logical analysis.
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