Abstract
Noise equivalent temperature difference (NETD) is the critical parameter for passive imaging detection. A modelling of the sensitivity performance including the f-1-type low flicker noise (1/f-noise) influence is presented, specifically investigated on the 1/f-noise to the sensitivity performance and the trade-offs between the low-noise amplifier (LNA)’s gain and the video frequency bandwidth. Measurement bench is set up, and results confirm that low-frequency modulation to the signal helps in improving the sensitivity performance. Based on the measurement results, it is concluded that signal power influences the 1/f-noise properties in detection diode. The amplifier’s output power is suggested to be lower than −30 dBm at least. This level is much lower than the point of P1dB (1 dB compressed point of the LNA).
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