QLF08_LaBel.pdf - 第14页
IC and Component Selection for Space Sy stems – Presented by Kenneth A . LaBel 14 Radiation and T raditional IC Reliability: Are the two related? • The short answer is yes – Radiation MTTF conditions can accelerate relia…
IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel
13
Radiation Effects and Reliability
• Radiation reliability is viewed differently than a
normal reliability (bathtub) consideration
– It is a mix of a MTTF (or Time to First Failure - TTFF)
condition known as Total Ionizing Dose (TID) or
Displacement Damage (DD) and a Mean Time Between
Failures (MTBF) condition known as Single Event
Effects (SEE).
Time
Increasing failure rate
Dose
Normal
Distribution of
Failures
TTFF
MTTF
TID
Time
Increasing failure rate
Random
Distribution of
Failures
SEE
Spikes in SEE rates
can occur based on
position in orbit
and solar event
IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel
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Radiation and Traditional IC Reliability:
Are the two related?
• The short answer is yes
– Radiation MTTF conditions can accelerate reliability
wearout mechanisms either by eroding electrical signal
margins or material damage
– Radiation MTBF conditions also can impact long-term
reliability
• A single energetic particle, for example, can cause device
failure instantaneously (such as with a gate rupture) or at a
later time due to material damage.
• The methods of coupling the radiation-induced impacts
into reliability calculations are limited
– NEPP Program has a new effort to explore this coupling on
state-of-the-art commercial Flash memories that are highly
sought by flight programs
Latent damage from a single particle
IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel
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Flight Program:
Typical Radiation Hardness Assurance (RHA) Flow
Environment
Definition
Project
Requirements
and
Specifications
Technology Hardness
Spacecraft or
Component
Mechanical
Modeling –
3D ray trace,
Monte Carlo,
NOVICE, etc.
Flight Program RHA Managed via Lead Radiation Engineer
Design Margins
External Environment
Environment in
the presence of
the spacecraft
Box/system Level
In-Flight
Evaluation
Technology
Performance
Anomaly
Resolution
Lessons
Learned
Design
Evaluation
Parts List Screening
Radiation
Characterizations,
Instrument
Calibration,
and Performance
Predictions
Mitigation
Approaches
and Design
Reliability
Iteration over project development cycle
Cradle to Grave!