The FMNS4000 from Fairview Microwave is a Noise Source with Frequency 0.2 to 500 MHz, Excess Noise Ratio (ENR) 31 dB, Flatness ±0.5 dB, Temperature Coefficient 0.01 dB/Degree C, Voltage Coefficient 0.1 dB/%V. Tags: Surface Mount. More details for FMNS4000 can be seen below.