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A little noise, I choose 1 uA RMS, due to high Z enable coupling, makes this circuit

a challenge. Timestep chosen 100 nS, lower would worsen results I would posit.

[ATTACH=full]198500[/ATTACH]

Of course we can sim this circuit to death, still not knowing what input is and application and......

Addendum, I see I missed C at E-B junction of transistor, adding that sim tolerated the 1 uA noise. My bad.

Note lowering or eliminating the 47K would add to the noise problem, so probably not a good idea. Also

beta of transistor probably a factor on noise immunity......

Interestingly I eliminated current noise source, used a 1V RMS noise source coupled by 5 pF to input, that

caused significant output noise problems.