Measuring Sub-Zero Frequency Drift in AT-Cut Resonators
Sub-zero frequency drift in AT-cut resonators stems from third-order polynomial mechanics and cut-angle offsets, requiring strict chamber moisture purges.
Timing Budget
Meaning
Allocation of allowable frequency error, jitter, and phase noise across all clock-generating components defines the total permissible signal inaccuracy in a digital system. In design specifications, the timing budget dictates the maximum allowed tolerance for each individual crystal oscillator. This allocation ensures that the system as a whole meets its performance requirements.
Clock Allocation
System designers partition the allowable drift among different circuits to optimize component costs. If the timing budget is tight, it requires the purchase of more expensive high-stability oscillators. A wider margin allows the use of standard, lower-cost resonators.
Sourcing Strategy
Procurement teams use the system requirements to negotiate with multiple component vendors. Knowing the limits of the timing budget allows buyers to purchase lower-cost components where tolerances are less critical. This optimization improves the profit margins on the finished assembly.
Liability Limit
Purchase agreements for high-reliability systems link component failure to financial penalties when system failures occur. If a supplier’s crystal drift exceeds the allocated timing budget and causes a system outage, the contract may impose liquidated damages. These clauses are balanced by liability caps that limit the supplier’s total financial risk to the value of the shipped components.
This structure protects the supplier from disproportionate claims.