This research activity focuses on the opportunities offered bythe latest advances in silicon technologies for realizing systemon-chip microwave radiometer. Such a highly integrated, lowcost,radiometer chip could be applied to the environmentalremote sensing and, in particular, to the forest fire detection.The feasibility study is carried-out in two steps. First, a proof ofthe concept is given by means of a discrete-componentradiometer operating at 12.65 GHz. This radiometer exploitsTV-SAT components such as low-noise down-converter and dishantenna. On-field measurements shows a radiometric contrast(increase of the antenna noise temperature due to the fire withrespect to the background) of about 8 K for a wooden fire of0.38 m2 placed 30 m away from the antenna. Then, a single-chip13 GHz radiometer has been designed exploiting a CMOS 90 nmstandard process. The sensor is based on a direct-conversionarchitecture with integrated LNA, Gilbert’s cell mixer and PLLfrequency synthesizer. The IF chain includes an active (gm-C)low-pass filter and a CMOS square-law detector. The circuitsimulations show a total receiver gain of 72 dB, an equivalentinput noise temperature of 105 K and an IF bandwidth of100 MHz.
System-on-Chip Microwave Radiometer for Thermal Remote Sensing and its Application to the Forest Fire Detection / F., Alimenti; D., Zito; A., Boni; Borgarino, Mattia; A., Fonte; A., Carboni; S., Leone; M., Pifferi; L., Roselli; B., Neri; R., Menozzi. - ELETTRONICO. - 1:(2008), pp. 1265-1268. (Intervento presentato al convegno 15th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008 tenutosi a St. Julian's, mlt nel 31 August - 3 September, 2008) [10.1109/ICECS.2008.4675090].