Hi,
We have obtained sevral questions from our customers.
When we increased the gain of the amplifier by changing a feedback resistor,
the THD+N has increased.
For example, the gain is 44 V/V, the THD+N is 0.7%.
We think that this reason is the deterioration of S/N characteristics by increasing the gain.
Is this correct?
Moreover, the stability time of start-up is 10s, is so longer.
We think that these reason are the decreasing of cut-off frequency by increasing the gain, the thermal problem because the LM4991 does not have the thermal pad.
Is this correct?
Could you please tell us about them as soon as possible?
Best Regards,
Kato