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Results of the payload in a simulated environment are presented in section 9. Electromagnetic compatibility (EMC) issues are specially treated. The section 5.1 and section 5.4 describe the space segment and modes of operation. The optimization in this mission is to use one of the lightning antennas integrated into gravity gradient boom (GGB) that increases the sensitivity and directional capability of the satellite toward nadir direction. One of the major challenges of using a nano-satellite for such a scientific payload is to integrate the lightning experiment antenna, receiver and data acquisition unit into the small nano-satellite structure. Adaptive filters will be developed to differentiate terrestrial electromagnetic impulsive signals from ionospheric or magnetospheric signals. To avoid false signals detection (false alarm), pre-selectors on-board LiNSAT are part of the Sferics detector. The lightning experiment will also observe signals of ionospheric and magnetospheric origin. The on-board RF lightning triggering system is a special capability of the LiNSAT. Special emphasis is on the investigation of transient electromagnetic waves in the frequency range of 20 – 40 MHz, well above plasma frequency to avoid ionospheric attenuations. The LiNSAT will carry a broadband radio-frequency receiver payload for the investigation of Sferics. 2009) which is scheduled to launch in April 2011. The LiNSAT is based on the design and the bus similar to the Austrian first astronomical nano-satellite TUGSat-1/ BRITE-Austria ( Koudelka, Egger et al. 1999) that at an altitude of about 1000 km the impulsive events produced by lightning can reach amplitudes up to 1 mV/m in a 1 MHz band around 40 MHz. We know from the Fast On-orbit Recording of Transient Events (FORTE) satellite mission ( Jacobson, Knox et al. In contrast to optical satellite observations the Sferics produced by lightning can be observed on the day and night side but with a smaller spatial resolution. The nano-satellite project under study emphasizes on the investigation of the global distribution and temporal variation of lightning phenomena using electromagnetic signals. The signal strength received by a satellite radio experiment depends on the distance and the energy of a lightning stroke as well as on the orientation of the discharge channel. Other forms are acoustic (thunder), optical and thermal, so the whole power of lightning flash is distributed into many chunks of energies. Only a small percentage of the total energy is converted to electromagnetic radiation. The global terrestrial lightning rate is in the order of 100 lightning flashes per second with an average energy per flash of about 10 9 Joule ( Rakov and Uman 2003). terrestrial lightning has a maximum power in the VLF and HF range, also trans-ionospheric pulses reaching at LEO and possibly to satellites in geostationary-Earth-orbit (GEO) peak at VHF. Depending on the source mechanism, the wave power peaks at different frequencies, e.g. These electromagnetic phenomena called Sferics cover the frequency range from a few Hertz (Schumann resonances) up to several GHz. The main scientific objective of the planned LiNSAT is the investigation of impulsive electromagnetic signals generated by electrical discharges in terrestrial thunderstorms (lightning), blizzards, volcanic eruptions, earthquakes and dust devils. The satellite is 20 cm cube and weighs ~ 5 kg. Fill factor of each pixel is 24%.The LiNSAT is a proposed project for the detection of electromagnetic signatures produced by lightning strokes (Sferics) in very high frequency (VHF) range in low-earth-orbit (LEO) around 800 km. A post layout simulation for test structure of the proposed current mode APS has been considered by standard 0.18 µm RF-CMOS technology of TSMC with a 10 µm×10 µm PD size. In pixel Delta Reset Sampling (DRS) architecture helps to make feasible on-chip parallel processing. The proposed structure with regards to using Deep-N-Well/P-Substrate junction as a guard ring, suppresses the pixel Cross-Talk (CTK) highly. Also integrated signal amplification inside the collection area of the pixel increases the sensitivity of the device due to the amplification in the pixel. Using two diodes (N+/P-Well and P-Well/Deep-N-Well) in parallel like a Pinned Photo-Diode (PPD) improves sensing of optical signal and leads to higher sensitivity than a conventional Photo-Diode (PD). In this paper we present a current mode structure for Active Pixel Sensor (APS) which is an essential part in fast Smart CMOS Image Sensors (SCIS).