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RECEIVER SENSITIVITY / NOISE

SENSITIVITY / NOISERECEIVER SENSITIVITYS ensitivity in a RECEIVER is normally taken as the minimum input signal (S) required to produce a specified outputminsignal having a specified signal-to- NOISE (S/N) ratio and is defined as the minimum signal-to- NOISE ratio times the meannoise power, see equation [1]. For a signal impinging on the antenna (system level) SENSITIVITY is known as minimumoperational SENSITIVITY (MOS), see equation [2]. Since MOS includes antenna gain, it may be expressed in dBLi (dBreferenced to a linear isotropic antenna). When specifying the SENSITIVITY of receivers intended to intercept and process pulsesignals, the minimum pulse width at which the specified SENSITIVITY applies must also be stated.

Table 2. Sample Noise Power Values (kToB) Bandwidth Bandwidth Ratio (dB) Watts dBW dBm 1 Hz 0 4x10-21-204 -174 1 kHz 30 4x10-18-174 -144 1 MHz 60 4x10-15-144 -114 1 GHz 90 4x10-12-114 -84 NOISE POWER, kT oB Thermal noise is spread more or less uniformly ov er the entire frequency spectrum. Therefore the amount of noise

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