Theoretical SNR Due to Aperture Jitter
tJ (s):    Non-negative value only
Input Frequency (Hz):    Non-negative integer only
SNR (dB):    Calculated value  
    Maximum Allowable Aperture Jitter
    Resolution (# Bits)    Non-negative integer only
    Input Frequency (Hz):    Non-negative integer only
    tJ (s):    Calculated value