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2 Threads found on edaboard.com: High Bandwidth Ota
It should be hard to add a buffer without introducing a pole. However, a zero might be generated to compensation one of high frequency pole.
A simple way is to set the amplifier up with a high gain like 100. If you input a 10mV signal the output should be 1V. Then you can simply increase the frequency monitoring the output until it reaches -3dB (0.707V). Now you can calculate the gain bandwidth product.