Several performance metrics are used for defining demodulators. Noise Figure describes the input sensitivity of any device. Input 1dB Compression Point is the maximum input signal that will result in 1dB of gain compression in the signal chain. Input Intercept Point is a metric to describe the intermodulation distortion ratios generated for a given input signal level. Selectivity is the ability of a receiver to select a wanted signal and reject a nearby unwanted signal. SFDR (Spurious Free Dynamic Range) is a measure of the best case available instantaneous dynamic range.