The SHARE Program
Iridium Technologies initial first-pass design success of a radiation-hardened standard cell digital library, and radiation-hardened digital gate array, was supported by The United States Air Force Research Laboratories (AFRL) Space Vehicles Directorate at Kirtland, Air Force Base through their Systematic Hierarchal Approach for Radiation Hardened Electronics (SHARE) Program.
SHARE's objective was to deliver affordable EDA tools, matched with design kits, to facilitate access to onshore foundries.
The prime contractor for the SHARE effort was L-3 Communications Electromagnetics & Electronics Division (San Diego, CA).
Some Results
Workbench at Iridium Technologies, LLC
The following figures show the results of a chain of inverters, used to extract individual gate timing. Stimulus curves are ORANGE, and resulting curves are BLUE.
The "notch" seen in the ORANGE curve was due to reflection, which was an artifact of the test setup.
Inverter Test Circuit - Rise Time - Post 100Krads
Inverter Test Circuit - Fall Time - Post 100Krads
Inverter Test Circuit - Rise Time - Post 300Krads
Inverter Test Circuit - Fall Time - Post 300Krads
Inverter Test Circuit - Rise Time - Post 1Mrad
Inverter Test Circuit - Fall Time - Post 1Mrad
|
Pre |
10k |
50k |
100K |
300K |
500K |
1M |
RISE (ns) |
23.5 |
17.1 |
20.5 |
18.5 |
19.9 |
22 |
29 |
FALL(ns) |
37 |
33.5 |
33 |
29 |
24.7 |
32 |
27.8 |
PROP R(ns) |
28.5 |
27.9 |
30 |
29.5 |
31.4 |
30 |
32.2 |
PROP F(ns) |
33.5 |
31.3 |
34.5 |
33 |
30 |
32.5 |
30.6 |
V high (V) |
3.28 |
3.28 |
3.28 |
3.28 |
3.28 |
3.28 |
3.28 |
V low (V) |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
0.0 |
Inverter Test Circuit - Average - Post Total-Dose Results
Inverter Test Circuit - Average - Post Total-Dose Results
Additionally
Iridium Technologies, LLC's contribution to the SHARE program was in providing the ONLY integrated circuitry, manufactured under the SHARE program, to EXCEED 1Mrad of total-dose Cobalt60 gamma radiation.
A complete total-dose test report of Iridium Technologies, LLC's radiation-hardened digital library may be made available to qualified persons and entities.
