I´m designing a LNA for an FM receiver. I need 60dB of IMR3 due to customer requirement. In order to achieve that high req. I used a diode in the input of the amplifier as a predistorsion method. It really works for intermodulation, but I have doubts about noise. Does anyone know if this is a good solution? What is the impact on noise of this diode in the input of the amplifier?