Hi Abhishek,
Unfortunately, I don’t have an access to the article with the link that you’ve provided. Can you, please, share the scheme (with appropriate citations according to regulations) that you are working on? Did you try to obtain/measure a power/energy spectrum at the input and at the output of your amplifier? It is known that transient response of any amplifier is equal to the ratio of the output voltage (in case of electrical signal)/power to the input voltage/power…