Noise generators and sources are used to produce noise outputs for testing radio frequency (RF) equipment. Noise generators are used to test and align many types of transmitters and receivers. They measure frequency, are tunable within certain frequency bands, and are used in a variety of test applications. Noise sources are used to provide known good signals. Noise diodes generate random noise. Like monolithic microwave integrated circuit (MMIC) amplifiers, noise diodes need a biasing structure made of other parts (i.e. resistors, capacitors and inductors) and a DC power supply in order to make noise. These singular semiconductor devices are an “engine” for noise sources and are used mainly for testing, calibration, and system analysis. Applications for noise generators and sources include encryption, dithering, jamming or jamming simulation, and base band signal simulation. Noise sources are also used for calibration references.