Can anyone please give some suggestion on what type of opamp is suitable to be build following these specifications:
1) VCC=3 to 5V
2) Rail to rail input and output stage. D-range is about VCC-0.4V for input and output.
3) THD < 0.1% for 20Hz, 1kHZ and 25kHz.
4.) GBW > 1MHz
5.) Open loop gain , 50~80dB
telescopic gain boosted op amp is a good choice, you can read some book such as analysis and design of analog integrated circuit 4th edition P.R.Gray, in additon, some final reports of EECS 240 are practical