Effects of space radiation damage and temperature on the noise in CCDs and LDD MOS transistors

Computer Science – Performance

Scientific paper

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Aerospace Environments, Charge Coupled Devices, Environment Effects, Environmental Tests, Metal Oxide Semiconductors, Noise Spectra, Radiation Damage, Transistors, Doped Crystals, Flux Density, Noise Measurement, Space Environment Simulation, Threshold Gates

Scientific paper

We have subjected lightly doped drain (LDD) MOS transistors to proton radiation damage representative of the damage they would receive on a typical orbital space telescope mission. We measured the noise spectral density at a function of gate voltage, temperature and total radiation dose. These data were then used to model the resultant read noise lower limit for that transistor if used as the charge conversion, output stage of a charge coupled device (CCD) imaging array detector. There is very clear excess noise contributed to the CCD output as a function of radiation. It is possible to select combinations of temperature, CCD duel correlated sample (DCS) time constant and gate voltage which minimize the performance degradation due to this excess noise.

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