how to test the bandwidth of OTA

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I've tape out an OTA, now want to test the bandwidth of it, just use oscilloscope，but the input load of oscilloscope is very big which will affect the bandwidth of OTA, can anyone give me any suggestion how to test it , thanks very much!
 

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.
 

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