yvkrishna wrote on Apr 25th, 2009, 1:20am:Hi,
My next question is what effect this would have,if this amplfier is used in ADC?
This would depend on what kind of ADC you are making and what inputs you are giving it.
For a pipelined or cyclic or other form of switched-capacitor-based ADC, the above response may be unacceptable because the slow settling of the doublet would either degrade performance too much, or force you to operate at lower speed and/or higher current levels.
For a continuous-time delta-sigma modulator, the above response may not be an issue, provided that you have some pre-filtering that prevents your modulator's STEP RESPONSE from being excited. As long as the input consists of a combination of finite sine wave inputs and the overall signal level is small (all very diffuse terms as you notice), your amp may be useful. As soon as the step response of the amp comes into play or your amp slews, you are in trouble.
Regards,
Vivek