TFAST - What does TFAST stand for? The Free Dictionary
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Since (Tfast) is smaller than (Tslow), the time difference between rising edges of two oscillators is reduced every cycle; thus the edge of fast oscillator eventually catches up the edge of slow oscillator and is detected by arbiter circuits.
In fine step decreasing the Tslow Tfast, is achievable by slightly different delays in two rings of oscillators.
This world-class performance was supported by the Defense Advanced Research Projects Agency (DARPA) under the Technology for Frequency Agile Digitally Synthesized Transmitters (TFAST