QLF08_LaBel.pdf - 第24页
IC and Component Selection for Space Sy stems – Presented by Kenneth A . LaBel 24 Systems Engineering and Risk • The determination of acceptability for device usage is a complex trade space – There is often more than one…
IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel
23
The Risk Trade Space –
Considerations for Device Selection (Incomplete)
• Cost and Schedule
– Procurement
– NRE
– Maintenance
– Qualification and test
• Performance
– Bandwidth/density
– SWaP
– System function and
criticality
– Other mission constraints
(ex., reconfigurability)
• System Complexity
– Secondary ICs (and all
their associated
challenges)
– Software, etc…
• Design Environment and
Tools
– Existing infrastructure and
heritage
– Simulation tools
• System operating factors
– Operate-through for single
events
– Survival-through for portions
of the natural environment
– Data operation (example,
95% data coverage)
• Radiation and Reliability
– SEE rates
– Lifetime (TID, thermal,
reliability,…)
– “Upscreening”
• System Validation and
Verification
IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel
24
Systems Engineering and Risk
• The determination of acceptability for
device usage is a complex trade space
– There is often more than one answer that’s
acceptable
• A more omnidirectional approach is taken
to evaluate the various risks
– Each of the three factors may be assigned
weighted priorities
• The systems engineer is often the “person in the
middle” evaluating the technical/reliability risks and
working with management to determine acceptable
risk levels
IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel
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Example: Considerations for Selecting a
“Custom” Device
• Three basic device type options
– Custom ASIC (CA)
• Also called standard cell or just ASIC
• Essentially a fully-custom design IC
– Structured ASIC (SA)
• Newer device that is a semi-custom design using built-in
functional blocks that are interconnected for a user’s design
by the device manufacturer
– Field Programmable Gate Array (FPGA)
• One-time or reprogrammable interconnecting of logic
performed by the user or can be done in-circuit
(reprogrammable options)
• These class of devices now have so much
functionality that they can be classified as system
on a chip (SOC)
• We will use the three discussed selection criteria for
this example.