AD8001 as an inverter is oscillating

Hi DiogoCoutinho,

AD8001 is a high speed current feedback amplifier. So, the layout / parasitics are very important to be observed in order to make sure you don't run into any instabilities. Please make sure you have an optimum layout with minimum trace lengths and to use SMT components. The feedback resistor value is a key to speed / stability.

There should not be any issues with operating AD8001 with an inverting gain of -10V/V. The feedback resistor value plays a key role in the loop response of a current feedback device. I'd suggest you raise the value of your feedback resistor (especially R8 at 237ohm seems to be too low). The higher the value of your feedback resistor, the slower the response and your oscillations may be resolved this way.

Also, you may want to find out which of your three sections is the root-cause by doing some experiments to isolate each section.

Regrds,

Hooman

Hi DiogoCoutinho,

AD8001 is a high speed current feedback amplifier. So, the layout / parasitics are very important to be observed in order to make sure you don't run into any instabilities. Please make sure you have an optimum layout with minimum trace lengths and to use SMT components. The feedback resistor value is a key to speed / stability.

There should not be any issues with operating AD8001 with an inverting gain of -10V/V. The feedback resistor value plays a key role in the loop response of a current feedback device. I'd suggest you raise the value of your feedback resistor (especially R8 at 237ohm seems to be too low). The higher the value of your feedback resistor, the slower the response and your oscillations may be resolved this way.

Also, you may want to find out which of your three sections is the root-cause by doing some experiments to isolate each section.

Regrds,

Hooman