Generating fixed-width pulses with pseudo-random periods

I've been tinkering with LTspice's rand(), random() and white() functions without success, trying to model a pulse generator for fixed-width pulses at random (or pseudo-random) intervals. In the end I gave up and just used the circuit below. Anyone know of a simpler model ?

A bit more tinkering and I think I've sussed those Spice functions. In case anyone's interested, here's my solution:

I am not familiar at all with those functions, Alec. In fact I did not know they were there.

Is it the equivalent to randomly varying frequency and also duty cycle, right?

I do not intend to derail your thread. My question: what would be the expresion governing duty cycle? Random as well? Thinking of this if I had to implement this with a micro.

what would be the expresion governing duty cycle? Random as well?

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Hi Agustin. Yes, since pulse width is fixed and period is random the duty cycle will also be random.