LAB / SA-MEM-SRAM-VARIATION-COVERAGE-060
SRAM variation and corner coverage
hierarchy, missingness, and closure
Change one declared source at a time. Every result retains its condition, lot, wafer, site, replicate, validity state, component ledger, denominator, and non-claim boundary.
SYNTHETIC HIERARCHY LAB / V128
Separate what moved from what was missing.
A known-ground-truth condition-lot-wafer-site hierarchy keeps variance, coverage, and uncertainty denominators in the same ledger.
Current tab onlyillustrative-original-surrogateNo PDK, production row, upload, storage, or network writeFixed condition is not sigma. This lab does not predict yield.Covariance remainder closes total variance; Evidence stop stays explicit.
Selected sigma3.051 mV
Population sigma3.048 mV
Common cells300 / 300
Closure error0.0e+0
Variance divisor
Condition matchedValid replicate rows at one condition, restricted to cells present in every condition.
SELECTED DISTRIBUTION
Read margin proxy
Mean120.000 mV
Minimum110.202 mV
P05114.900 mV
Median120.054 mV
P95125.097 mV
Maximum129.111 mV
Degrees of freedom599
First-order sigma relative uncertainty2.89%
iid normal reference only; hierarchy and repeated observations reduce effective independence
Selected values600
Selected cells300
Selected cell-condition pairs300
Valid / eligible observations2,400 / 2,400