signal processing - Ridiculously High frequency resolution common in function generators? -


i checked common commercial high-quality lab function generators , seem provide frequency output upto 50 mhz (not big deal) resolution of 1 uhz ? means, can generate signal both 50000000 hz , 50000000.000001 hz ?? equate time-period difference of 4.00355*10^-22 seconds!!! how can possibly generate pulses high of time-resolution?

any idea?

they don't. might step through function lookup table double precision step increment. doesn't mean output differ amount above noise floor of system (unless wait very long time).


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