Noise in Microwave Transmission Applications of Gunn and IMPATT Diodes -- IMPATT and Gunn Diode Noise Diagnostics

In a communications system, the noise performance answer of most significance is the signal to noise ratio at the baseband output from a receiver. This is reflected in the form of the noise specification for components used in communications service. This is a ratio of noise in a 3 kHz bandwidth to the power in a test tone which causes 200 kHz deviation in the transmitter. This 3 kHz bandwidth is swept through the baseband region--typically 50 kHz to 5 mHz.