radiation hardened


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radiation hardened

Refers to electronic products used in space, satellite, nuclear plant and military applications. They are built to withstand cosmic rays and other natural electromagnetic radiation, as well as nuclear explosions. The effects of such radiation can be a temporary alteration or a slow degradation of the semiconductor elements in memory cells and transistors. If either a cell or transistor is induced to change its state, it can cause a program to crash (see abend). As the elements in a chip are made smaller, radiation has an increasingly greater and harmful influence.

"Rad hard" products are highly insulated from the outside world. In addition, devices may be built with redundant components at the system level or at the circuit level, and error-correcting memories can detect and correct a memory failure.


A Wide Resistance Difference
This C-RAM phase change 4MB memory chip is shown without the cover and before the leads are cut. When the bit is 0, the memory cell resistance is 5,000 ohms, but 100,000 ohms when a 1. Due to the huge resistance difference between a 0 and 1, the chip is inherently radiation hardened (see phase change memory). (Image courtesy of BAE Systems, www.baesystems.com)
References in periodicals archive ?
The report includes the geographic segmentation of the Radiation Hardened Electronics and Semiconductors Market into four major regions: North America, Europe, Asia-Pacific, and Rest of the World.
This is achieved by the collaboration of the most experienced companies in this field, namely Airbus Defence and Space (G, F) for specific heritage on high reliable and radiation hardened systems, ARM (UK) providing its excellence in processor core IPs and know-how in this field of developments and Atmel (F) and Dolphin (F) contributing with their space and STM65nm technology experience and knowledge respectively.
The radiation hardened QDRII+ SRAMs also deliver outstanding performance, with clock speeds up to 250 MHz and throughput up to 36 gigabits per second (Gbps).
Even though Single Event Effects (SEE) are mitigated with the use of radiation hardened flip-flops on most critical functions SEE sensitivity of the whole ASIC is not fully known.
3V/[+ or -]15V, low output noise, 15V to 50V input voltage, with a nominal of 28, per MIL-STD-704, fault tolerant magnetic feedback circuit, inherent radiation tolerance, with radiation hardened versions available, military temperature range of -55[degrees]C to +125[degrees]C, without derating input voltage or output power and low regulation based on dual PWM topology.
RAD has a proven track record of providing radiation hardened products and services in the satellite, high reliability and high performance markets.

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