With the goal of in-situ radiation dosimetry, SSPACE (Small-spacecraft Systems and PAyload CEntre), IIST Thiruvananthapuram, India, is developing a constellation of 3U CubeSats with AHAN as the first in this series expected to be launched by 3rd quarter of 2023. The CubeSat is about 2kg in mass with a nominal power consumption of about 3 Watts. The CubeSat houses a Geiger-Muller Counter for radiation dosimetry, which serves as the payload. The satellite is developed with all in-house subsystems which will also serve the purpose of flight validation of the subsystems. 

The invention is a closed loop MEMS Accelerometer implemented using suspended gate field effect transistors (SGFET) and the method of fabricating this sensor. This closed loop accelerometer (Closed loop in plane movable SGFET-CLIP-SGFET) has an in-plane movable suspended gate FETs in the differential amplifier configuration. In the closed loop operation, the CMOS-MEMS SGFET differential amplifier’s output voltage is used, through a closed loop controller and a high voltage charge pump to drive an actuator which brings the gate back to its resting position.