There is significant and immediate interest to use theequivalent of RPXO in high end geothermal and energy exploration instruments that experience very long operating life at high temperatures while under frequennt shock and vibration. Advanced jet engine controllers that include electronic sensors for the jet engines demand reliable operation of the electronics near the engine at higher temperatures and facing repeated thermal cycles. This market segment targets high signal processing reliability in order to eleminate complex, heavy and unreliable wire harnesses in the present aircrafts. this is a new and fast growing market for RPXO. Low flicker of SiGe HBT makes the ASIC for low phase noise and low jitter applications such as instrumentation, radar, optical transceivers and high speed network applications. The proposed RPXO is intended for very demanding and high radiation missions such as Europa while it would be the perfect solution for missions with very wide operating temperatures such as missions to MArs, Moon, Titan,and comets. The compelling features and performance of the proposed RPXO makes it highly suitable for most typical and conventional scientific and commercial space missions. This device could Operate during take-off, interplanetary travel, orbit entry as well as landing of the probe. RPXO Can be used in processor modules, DSP, servo control, receivers, transmitters, & sensors, auxiliary memory modules, etc.