There could be several reasons why your non-inverting amplifier may not be working properly with a sine wave input of 400mV amplitude and a frequency of 41.3KHz. Here are a few potential issues to consider:
Saturation of the operational amplifier: The UA741CP model, which is a popular general-purpose operational amplifier, has limited bandwidth and slew rate. At higher frequencies, the UA741CP may not be able to keep up with the rapid changes in the input signal, leading to distortion or even complete failure of amplification. The datasheet for the UA741CP specifies a unity gain bandwidth of around 1MHz, which suggests that it may not be suitable for amplifying a 41.3KHz signal.
Insufficient supply voltage: The UA741CP typically requires a higher supply voltage to operate effectively. Ensure that the power supply voltages provided to the operational amplifier are within the recommended range specified in the datasheet. If the supply voltage is too low, it can result in limited output swing and distortion.
Gain bandwidth limitation: The gain of your non-inverting amplifier is set to x10. Considering the limited bandwidth of the UA741CP, the overall gain might be too high for the given frequency. The gain bandwidth product (GBP) of an operational amplifier represents the maximum product of gain and bandwidth. In the case of the UA741CP, the GBP is around 1MHz. To maintain a stable amplification, the product of gain and frequency should be well below the GBP value.
Input impedance mismatch: The input impedance of the non-inverting amplifier should be significantly higher than the source impedance. If the source impedance is relatively high or comparable to the input impedance of the amplifier, it can affect the performance and introduce errors in the amplification.
To address these issues, you may consider the following steps:
Check the datasheet of the UA741CP to ensure that it is suitable for amplifying signals at your desired frequency range. If necessary, choose an operational amplifier with a higher bandwidth and faster slew rate.
Confirm that the power supply voltages provided to the operational amplifier meet the recommended range specified in the datasheet.
Reduce the gain of the amplifier to a level that is within the limitations of the operational amplifier's bandwidth. Alternatively, consider using an operational amplifier with a higher GBP or a dedicated amplifier designed for higher frequencies.
Verify that the input impedance of your amplifier is significantly higher than the source impedance to avoid impedance mismatch.
By addressing these considerations, you should be able to troubleshoot and improve the performance of your non-inverting amplifier for the given input signal.