Noise Parameter Measurement Method
A noise factor (or equivalently a noise figure) of a device is a common metric for representing the amount of signal-to-noise-ratio (SNR) degradation due to noise generated by the device. While noise factors are commonly used, they are not invariant quantities of the associated devices and are affected by how the devices are embedded into larger systems. To model noise factor dependence on the embedding, noise parameters are used. There are four noise parameters: minimum noise factor, Fmin, equivalent noise resistance, Rn, and optimal signal-source admittance for minimum noise.
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