A 2-flop synchronizer is used to cross a single-bit signal from a 100MHz domain to a 1GHz domain. If the destination clock frequency increases to 2GHz, what happens to the Mean Time Between Failures (MTBF)?
The MTBF of a synchronizer is exponentially related to the time available for a metastable signal to settle (Tsettle). As the destination frequency increases, the clock period decreases, leaving less time for the first flop to resolve metastability before the second flop samples it, thus reducing MTBF.
