The upper bound on the input frequency of the Du and Northrop phase measuring system is set by the PLL VCO (50MHz for an NE564) or the counters (115MHz for 74F579s)
The upper bound on the input frequency of the Du andNorthrop phase measuring system is set by the PLL VCO (50MHz for an NE564) or thecounters (115MHz for 74F579s)