AnsweredAssumed Answered

ADA4817 oscillation problem

Question asked by on Mar 30, 2015
Latest reply on Mar 31, 2015 by harryh



I am using ADA4817_1 in my circuit as low noise amplifier. I am using SOIC package. In my PCB I am using it as DIP so I have used SOIC to DIP adapter. The SOIC package has metal under its body. On my adapter there is metal in the middle line of the array of total 8 pins. Now if I solder opamp chip directly on the adapter there is a chance that all pins get shorted through metal connection. So we had put a tape in the gap between the body of SOIC chip and the adapter. I am experiencing oscillation of 20 MHz from my circuit of amplitude 10 mV. I am expecting it is coming from the opamp. Is there any way to get rid of the oscillation? Is there any mistake in the process I tried to avoid metal short as I described before. I followed power supply by passing technique in my circuit.