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ADA4932, peaking at 90 MHz

Question asked by snowman on Jun 13, 2012
Latest reply on Jun 15, 2012 by harryh



I ordered the dev board for the ADA4932 to test the opamp.


I setup the opamp as a simple buffer with 1k ohm for the input and feedback resistors.  The output is ac coupled with 0.1uf and loaded with 50 ohm.


I observed a peak in the frequency response of about 20 at 90MHz.


What am I doing wrong, as I was expecting a flat response.